@article{2017PASJ...69...82M,

title = {OISTER optical and near-infrared monitoring observations of peculiar radio-loud active galactic nucleus SDSS J110006.07+442144.3},

author = {T Morokuma and M Tanaka and Y T Tanaka and R Itoh and N Tominaga and P Gandhi and E Pian and P Mazzali and K Ohta and E Matsumoto and T Shibata and H Akimoto and H Akitaya and G B Ali and T Aoki and M Doi and N Ebisuda and A Essam and K Fujisawa and H Fukushima and S Goda and Y Gouda and H Hanayama and Y Hashiba and O Hashimoto and K Hayashida and Y Hiratsuka and S Honda and M Imai and K Inoue and M Ishibashi and I Iwata and H Izumiura and Y Kanda and M Kawabata and K Kawaguchi and N Kawai and M Kokubo and D Kuroda and H Maehara and H Mito and K Mitsuda and R Miyagawa and T Miyaji and Y Miyamoto and K Morihana and Y Moritani and K Morokuma-Matsui and K Murakami and K ~L Murata and T Nagayama and K Nakamura and T Nakaoka and K Niinuma and T Nishimori and D Nogami and Y Oasa and T Oda and T Ohshima and Y Saito and S Sakata and S Sako and Y Sarugaku and S Sawada-Satoh and G Seino and K Sorai and T Soyano and F Taddia and J Takahashi and Y Takagi and K Takaki and K Takata and K Tarusawa and M Uemura and T Ui and R Urago and K Ushioda and J -i Watanabe and M Watanabe and S Yamashita and K Yanagisawa and Y Yonekura and M Yoshida},

url = {http://adsabs.harvard.edu/abs/2017PASJ...69...82M},

doi = {10.1093/pasj/psx075},

year  = {2017},

date = {2017-01-01},

journal = {Publications of the ASJ},

volume = {69},

pages = {82},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2017ApJ...849...23M,

title = {A Face-on Accretion System in High-mass Star Formation: Possible Dusty Infall Streams within 100 AU},

author = {K Motogi and T Hirota and K Sorai and Y Yonekura and K Sugiyama and M Honma and K Niinuma and K Hachisuka and K Fujisawa and A J Walsh},

url = {http://adsabs.harvard.edu/abs/2017ApJ...849...23M},

doi = {10.3847/1538-4357/aa8d75},

year  = {2017},

date = {2017-01-01},

journal = {Astrophysical Journal},

volume = {849},

pages = {23},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2017PASJ...69...67H,

title = {CO Multi-line Imaging of Nearby Galaxies (COMING). II. Transitions between atomic and molecular gas, diffuse and dense gas, gas and stars in the dwarf galaxy NGC 2976},

author = {T Hatakeyama and N Kuno and K Sorai and H Kaneko and Y Miyamoto and K Muraoka and M Takeda and K Yanagitani and N Kishida and M Umei and T Tanaka and Y Tomiyasu and H Nakanishi and C Saita and S Ueno and D Salak and N Matsumoto and K Morokuma-Matsui and H A Pan and N Nakai},

url = {http://adsabs.harvard.edu/abs/2017PASJ...69...67H},

doi = {10.1093/pasj/psx044},

year  = {2017},

date = {2017-01-01},

journal = {Publications of the ASJ},

volume = {69},

pages = {67},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2017ApJ...835...55T,

title = {The 1.1 mm Continuum Survey of the Small Magellanic Cloud: Physical Properties and Evolution of the Dust-selected Clouds},

author = {T Takekoshi and T Minamidani and S Komugi and K Kohno and T Tosaki and K Sorai and E Muller and N Mizuno and A Kawamura and T Onishi and Y Fukui and H Ezawa and T Oshima and K S Scott and J E Austermann and H Matsuo and I Aretxaga and D H Hughes and R Kawabe and G W Wilson and M S Yun},

url = {http://adsabs.harvard.edu/abs/2016PASJ...68...89M},

doi = {10.3847/1538-4357/835/1/55},

year  = {2017},

date = {2017-01-01},

journal = {Astrophysical Journal},

volume = {835},

pages = {55},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2017MNRAS.469..383J,

title = {On the effective turbulence driving mode of molecular clouds formed in disc galaxies},

author = {Keitaro {Jin} and Diane M {Salim} and Christoph {Federrath} and Elizabeth J {Tasker} and Asao {Habe} and Jouni T {Kainulainen}},

url = {https://ui.adsabs.harvard.edu/abs/2017MNRAS.469..383J/abstract},

doi = {10.1093/mnras/stx737},

year  = {2017},

date = {2017-01-01},

journal = {Monthly Notices of the RAS},

volume = {469},

number = {1},

pages = {383-393},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2017ApJ...835..142T,

title = {Triggered O Star Formation in M20 via Cloud-Cloud Collision: Comparisons between High-resolution CO Observations and Simulations},

author = {K {Torii} and Y {Hattori} and K {Hasegawa} and A {Ohama} and T ~J {Haworth} and K {Shima} and A {Habe} and K {Tachihara} and N {Mizuno} and T {Onishi} and A {Mizuno} and Y {Fukui}},

url = {https://ui.adsabs.harvard.edu/abs/2017ApJ...835..142T/abstract},

doi = {10.3847/1538-4357/835/2/142},

year  = {2017},

date = {2017-01-01},

journal = {Astrophysical Journal},

volume = {835},

number = {2},

pages = {142},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2017MNRAS.471L..21Ob,

title = {Imprints of the super-Eddington accretion on the quasar clustering},

author = {Taira {Oogi} and Motohiro {Enoki} and Tomoaki {Ishiyama} and Masakazu A ~R {Kobayashi} and Ryu {Makiya} and Masahiro {Nagashima} and Takashi {Okamoto} and Hikari {Shirakata}},

url = {https://ui.adsabs.harvard.edu/abs/2017MNRAS.471L..21O/abstract},

doi = {10.1093/mnrasl/slx102},

year  = {2017},

date = {2017-01-01},

journal = {Monthly Notices of the RAS},

volume = {471},

number = {1},

pages = {L21-L25},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2017MNRAS.464.4866Ob,

title = {The metal enrichment of passive galaxies in cosmological simulations of galaxy formation},

author = {Takashi {Okamoto} and Masahiro {Nagashima} and Cedric G {Lacey} and Carlos S {Frenk}},

url = {https://ui.adsabs.harvard.edu/abs/2017MNRAS.464.4866O/abstract},

doi = {10.1093/mnras/stw2729},

year  = {2017},

date = {2017-01-01},

journal = {Monthly Notices of the RAS},

volume = {464},

number = {4},

pages = {4866-4874},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2017MNRAS.466L.123I,

title = {Radiation feedback in dusty clouds},

author = {Shohei {Ishiki} and Takashi {Okamoto}},

url = {https://ui.adsabs.harvard.edu/abs/2017MNRAS.466L.123I/abstract},

doi = {10.1093/mnrasl/slw253},

year  = {2017},

date = {2017-01-01},

journal = {Monthly Notices of the RAS},

volume = {466},

number = {1},

pages = {L123-L127},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Dobbs16,

title = {Magnetic field evolution and reversals in spiral galaxies},

author = {Clare Dobbs and Daniel Price and Alex Pettitt and Matthew Bate and Terrance Tricco},

url = {http://adsabs.harvard.edu/abs/2016MNRAS.461.4482D},

doi = {10.1093/mnras/stw1625},

year  = {2016},

date = {2016-10-01},

journal = {MNRAS},

volume = {461},

number = {4},

pages = {4482-4495},

abstract = {We study the evolution of galactic magnetic fields using 3D smoothed particle magnetohydrodynamics (SPMHD) simulations of galaxies with an imposed spiral potential. We consider the appearance of reversals of the field, and amplification of the field. We find magnetic field reversals occur when the velocity jump across the spiral shock is above $approx$20km s$^{-1}$, occurring where the velocity change is highest, typically at the inner Lindblad resonance (ILR) in our models. Reversals also occur at corotation, where the direction of the velocity field reverses in the co-rotating frame of a spiral arm. They occur earlier with a stronger amplitude spiral potential, and later or not at all with weaker or no spiral arms. The presence of a reversal at a radii of around 4-6 kpc in our fiducial model is consistent with a reversal identified in the Milky Way, though we caution that alternative Galaxy models could give a similar reversal. We find that relatively high resolution, a few million particles in SPMHD, is required to produce consistent behaviour of the magnetic field. Amplification of the magnetic field occurs in the models, and while some may be genuinely attributable to differential rotation or spiral arms, some may be a numerical artefact. We check our results using Athena, finding reversals but less amplification of the field, suggesting that some of the amplification of the field with SPMHD is numerical.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Few2016,

title = {Testing hydrodynamics schemes in galaxy disc simulations},

author = {Gareth Few and Clare Dobbs and Alex Pettitt and Lukas Konstandin},

url = {http://adsabs.harvard.edu/abs/2016MNRAS.460.4382F},

doi = {10.1093/mnras/stw1226},

year  = {2016},

date = {2016-08-01},

journal = {MNRAS},

volume = {460},

number = {4},

pages = {4382-4396},

abstract = {We examine how three fundamentally different numerical hydrodynamics codes follow the evolution of an isothermal galactic disc with an external spiral potential. We compare an adaptive mesh refinement code (RAMSES), a smoothed particle hydrodynamics code (SPHNG), and a volume-discretized mesh-less code (GIZMO). Using standard refinement criteria, we find that RAMSES produces a disc that is less vertically concentrated and does not reach such high densities as the SPHNG or GIZMO runs. The gas surface density in the spiral arms increases at a lower rate for the RAMSES simulations compared to the other codes. There is also a greater degree of substructure in the SPHNG and GIZMO runs and secondary spiral arms are more pronounced. By resolving the Jeans length with a greater number of grid cells, we achieve more similar results to the Lagrangian codes used in this study. Other alterations to the refinement scheme (adding extra levels of refinement and refining based on local density gradients) are less successful in reducing the disparity between RAMSES and SPHNG/GIZMO. Although more similar, SPHNG displays different density distributions and vertical mass profiles to all modes of GIZMO (including the smoothed particle hydrodynamics version). This suggests differences also arise which are not intrinsic to the particular method but rather due to its implementation. The discrepancies between codes (in particular, the densities reached in the spiral arms) could potentially result in differences in the locations and time-scales for gravitational collapse, and therefore impact star formation activity in more complex galaxy disc simulations.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pettitt2016,

title = {Gas and stellar spiral structures in tidally perturbed disc galaxies},

author = {Alex Pettitt and Elizabeth Tasker and James Wadsley },

url = {http://mnras.oxfordjournals.org/content/458/4/3990},

doi = {10.1093/mnras/stw588},

year  = {2016},

date = {2016-06-01},

journal = {MNRAS},

volume = {458},

number = {4},

pages = {3990-4007},

abstract = {Tidal interactions between disc galaxies and low-mass companions are an established method for generating galactic spiral features. In this work, we present a study of the structure and dynamics of spiral arms driven in interactions between disc galaxies and perturbing companions in 3D N-body/smoothed hydrodynamical numerical simulations. Our specific aims are to characterize any differences between structures formed in the gas and stars from a purely hydrodynamical and gravitational perspective, and to find a limiting case for spiral structure generation. Through analysis of a number of different interacting cases, we find that there is very little difference between arm morphology, pitch angles and pattern speeds between the two media. The main differences are a minor offset between gas and stellar arms, clear spurring features in gaseous arms, and different radial migration of material in the stronger interacting cases. We investigate the minimum mass of a companion required to drive spiral structure in a galactic disc, finding the limiting spiral generation cases with companion masses of the order of 1 × 109 M⊙, equivalent to only 4 per cent of the stellar disc mass, or 0.5 per cent of the total galactic mass of a Milky Way analogue.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016PASJ...68...25M,

title = {The New Numerical Galaxy Catalog (v^2GC): An updated semi-analytic model of galaxy and active galactic nucleus formation with large cosmological N-body simulations},

author = {R Makiya and M Enoki and T Ishiyama and M A R Kobayashi and M Nagashima and T Okamoto and K Okoshi and T Oogi and H Shirakata},

url = {http://adsabs.harvard.edu/abs/2016PASJ...68...25M},

doi = {10.1093/pasj/psw005},

year  = {2016},

date = {2016-01-01},

journal = {Publications of the ASJ},

volume = {68},

pages = {25},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016MNRAS.461.4389S,

title = {Theoretical re-evaluations of the black hole mass-bulge mass relation - I. Effect of seed black hole mass},

author = {H Shirakata and T Kawaguchi and T Okamoto and R Makiya and T Ishiyama and Y Matsuoka and M Nagashima and M Enoki and T Oogi and M A R Kobayashi},

url = {http://adsabs.harvard.edu/abs/2017FrASS...4...15S},

doi = {10.1093/mnras/stw1798},

year  = {2016},

date = {2016-01-01},

journal = {Monthly Notices of the RAS},

volume = {461},

pages = {4389-4394},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016Sci...352.1559I,

title = {Detection of an oxygen emission line from a high-redshift galaxy in the reionization epoch},

author = {A K Inoue and Y Tamura and H Matsuo and K Mawatari and I Shimizu and T Shibuya and K Ota and N Yoshida and E Zackrisson and N Kashikawa and K Kohno and H Umehata and B Hatsukade and M Iye and Y Matsuda and T Okamoto and Y Yamaguchi},

url = {http://adsabs.harvard.edu/abs/2016Sci...352.1559I},

doi = {10.1126/science.aaf0714},

year  = {2016},

date = {2016-01-01},

journal = {Science},

volume = {352},

pages = {1559-1562},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016PASJ...68...89M,

title = {CO Multi-line Imaging of Nearby Galaxies (COMING). I. Physical properties of molecular gas in the barred spiral galaxy NGC 2903},

author = {K Muraoka and K Sorai and N Kuno and N Nakai and H Nakanishi and M Takeda and K Yanagitani and H Kaneko and Y Miyamoto and N Kishida and T Hatakeyama and M Umei and T Tanaka and Y Tomiyasu and C Saita and S Ueno and N Matsumoto and D Salak and K Morokuma-Matsui},

url = {http://adsabs.harvard.edu/abs/2016PASJ...68...89M},

doi = {10.1093/pasj/psw080},

year  = {2016},

date = {2016-01-01},

journal = {Publications of the ASJ},

volume = {68},

pages = {89},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016PASJ...68...74Y,

title = {The Hitachi and Takahagi 32 m radio telescopes: Upgrade of the antennas from satellite communication to radio astronomy},

author = {Y Yonekura and Y Saito and K Sugiyama and K L Soon and M Momose and M Yokosawa and H Ogawa and K Kimura and Y Abe and A Nishimura and Y Hasegawa and K Fujisawa and T Ohyama and Y Kono and Y Miyamoto and S Sawada-Satoh and H Kobayashi and N Kawaguchi and M Honma and K M Shibata and K Sato and Y Ueno and T Jike and Y Tamura and T Hirota and A Miyazaki and K Niinuma and K Sorai and H Takaba and K Hachisuka and T Kondo and M Sekido and Y Murata and N Nakai and T Omodaka},

url = {http://adsabs.harvard.edu/abs/2016PASJ...68...74Y},

doi = {10.1093/pasj/psw045},

year  = {2016},

date = {2016-01-01},

journal = {Publications of the ASJ},

volume = {68},

pages = {74},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016PASJ...68...72S,

title = {Observations of 6.7 GHz methanol masers with East-Asian VLBI Network. II. Internal proper motion measurement in G006.79-00.25},

author = {K Sugiyama and K Fujisawa and K Hachisuka and Y Yonekura and K Motogi and S Sawada-Satoh and N Matsumoto and D Hirano and K Hayashi and H Kobayashi and N Kawaguchi and K M Shibata and M Honma and T Hirota and Y Murata and A Doi and H Ogawa and K Kimura and K Niinuma and X Chen and B Xia and B Li and K Sorai and M Momose and Y Saito and H Takaba and T Omodaka and K T Kim and Z Shen},

url = {http://adsabs.harvard.edu/abs/2016PASJ...68...72S},

doi = {10.1093/pasj/psv089},

year  = {2016},

date = {2016-01-01},

journal = {Publications of the ASJ},

volume = {68},

pages = {72},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016PASJ...68...69M,

title = {Accelerating a water maser face-on jet from a high mass young stellar object},

author = {K Motogi and K Sorai and M Honma and T Hirota and K Hachisuka and K Niinuma and K Sugiyama and Y Yonekura and K Fujisawa},

url = {http://adsabs.harvard.edu/abs/2016PASJ...68...69M},

doi = {10.1093/pasj/psu142},

year  = {2016},

date = {2016-01-01},

journal = {Publications of the ASJ},

volume = {68},

pages = {69},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016PASJ...68...18M,

title = {CO(J = 3-2) on-the-fly mapping of the nearby spiral galaxies NGC 628 and NGC 7793: Spatially resolved CO(J = 3-2) star-formation law},

author = {K Muraoka and M Takeda and K Yanagitani and H Kaneko and K Nakanishi and N Kuno and K Sorai and T Tosaki and K Kohno},

url = {http://adsabs.harvard.edu/abs/2016PASJ...68...18M},

doi = {10.1093/pasj/psv134},

year  = {2016},

date = {2016-01-01},

journal = {Publications of the ASJ},

volume = {68},

pages = {18},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016ApJ...819..144W,

title = {Molecular Distribution in the Spiral Arm of M51},

author = {Y Watanabe and N Sakai and K Sorai and J Ueda and S Yamamoto},

url = {http://adsabs.harvard.edu/abs/2016ApJ...819..144W},

doi = {10.3847/0004-637X/819/2/144},

year  = {2016},

date = {2016-01-01},

journal = {Astrophysical Journal},

volume = {819},

pages = {144},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016MNRAS.456..300O,

title = {Mass and size growth of early-type galaxies by dry mergers in cluster environments},

author = {Taira {Oogi} and Asao {Habe} and Tomoaki {Ishiyama}},

url = {https://ui.adsabs.harvard.edu/abs/2016MNRAS.456..300O/abstract},

doi = {10.1093/mnras/stv2581},

year  = {2016},

date = {2016-01-01},

journal = {Monthly Notices of the RAS},

volume = {456},

number = {1},

pages = {300-313},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016MNRAS.461.1684F,

title = {GMC evolution in a barred spiral galaxy with star formation and thermal feedback},

author = {Yusuke {Fujimoto} and Greg L {Bryan} and Elizabeth J {Tasker} and Asao {Habe} and Christine M {Simpson}},

url = {https://ui.adsabs.harvard.edu/abs/2016MNRAS.461.1684F/abstract},

doi = {10.1093/mnras/stw1461},

year  = {2016},

date = {2016-01-01},

journal = {Monthly Notices of the RAS},

volume = {461},

number = {2},

pages = {1684-1700},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016MNRAS.459..108S,

title = {Galactic Centre hypershell model for the North Polar Spurs},

author = {Y {Sofue} and A {Habe} and J {Kataoka} and T {Totani} and Y {Inoue} and S {Nakashima} and H {Matsui} and M {Akita}},

url = {https://ui.adsabs.harvard.edu/abs/2016MNRAS.459..108S/abstract},

doi = {10.1093/mnras/stw623},

year  = {2016},

date = {2016-01-01},

journal = {Monthly Notices of the RAS},

volume = {459},

number = {1},

pages = {108-120},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016Sci...352.1559Ib,

title = {Detection of an oxygen emission line from a high-redshift galaxy in the reionization epoch},

author = {Akio K {Inoue} and Yoichi {Tamura} and Hiroshi {Matsuo} and Ken {Mawatari} and Ikkoh {Shimizu} and Takatoshi {Shibuya} and Kazuaki {Ota} and Naoki {Yoshida} and Erik {Zackrisson} and Nobunari {Kashikawa} and Kotaro {Kohno} and Hideki {Umehata} and Bunyo {Hatsukade} and Masanori {Iye} and Yuichi {Matsuda} and Takashi {Okamoto} and Yuki {Yamaguchi}},

url = {https://ui.adsabs.harvard.edu/abs/2016Sci...352.1559I/abstract},

doi = {10.1126/science.aaf0714},

year  = {2016},

date = {2016-01-01},

journal = {Science},

volume = {352},

number = {6293},

pages = {1559-1562},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2016MNRAS.461.3563S,

title = {Nebular line emission from z > 7 galaxies in a cosmological simulation: rest-frame UV to optical lines},

author = {Ikkoh {Shimizu} and Akio K {Inoue} and Takashi {Okamoto} and Naoki {Yoshida}},

url = {https://ui.adsabs.harvard.edu/abs/2016MNRAS.461.3563S/abstract},

doi = {10.1093/mnras/stw1423},

year  = {2016},

date = {2016-01-01},

journal = {Monthly Notices of the RAS},

volume = {461},

number = {4},

pages = {3563-3575},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Haworth2015b,

title = {Isolating signatures of major cloud-cloud collisions - II. The lifetimes of broad bridge features},

author = {Thomas Haworth and Kazuhiro Shima and Elizabeth Tasker and Yasuo Fukui and Kazufumi Torii and Jim Dale and Ken Takahira and Asao Habe},

url = {http://adsabs.harvard.edu/abs/2015MNRAS.454.1634H},

doi = {10.1093/mnras/stv2068},

year  = {2015},

date = {2015-12-01},

journal = {MNRAS},

volume = {454},

abstract = {We investigate the longevity of broad bridge features in position-velocity diagrams that appear as a result of cloud-cloud collisions. Broad bridges will have a finite lifetime due to the action of feedback, conversion of gas into stars and the time-scale of the collision. We make a series of analytic arguments with which to estimate these lifetimes. Our simple analytic arguments suggest that for collisions between clouds larger than R ˜ 10 pc the lifetime of the broad bridge is more likely to be determined by the lifetime of the collision rather than the radiative or wind feedback disruption time-scale. However, for smaller clouds feedback becomes much more effective. This is because the radiative feedback time-scale scales with the ionizing flux Nly as R^{7/4}N_{ly}^{-1/4} so a reduction in cloud size requires a relatively large decrease in ionizing photons to maintain a given time-scale. We find that our analytic arguments are consistent with new synthetic observations of numerical simulations of cloud-cloud collisions (including star formation and radiative feedback). We also argue that if the number of observable broad bridges remains ˜ constant, then the disruption time-scale must be roughly equivalent to the collision rate. If this is the case, our analytic arguments also provide collision rate estimates, which we find are readily consistent with previous theoretical models at the scales they consider (clouds larger than about 10 pc) but are much higher for smaller clouds.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pan2015,

title = {What is a GMC? Are observers and simulators discussing the same star-forming clouds?},

author = {Hsi-An Pan and Yusuke Fujimoto and Elizabeth Tasker and Erik Rosolowsky and Dario Colombo and Samantha Benincasa and James Wadsley},

url = {http://adsabs.harvard.edu/abs/2015MNRAS.453.3082P},

doi = {10.1093/mnras/stv1843},

year  = {2015},

date = {2015-11-01},

journal = {MNRAS },

volume = {453},

abstract = {As both simulations and observations reach the resolution of the star-forming molecular clouds, it becomes important to clarify if these two techniques are discussing the same objects in galaxies. We compare clouds formed in a high-resolution galaxy simulation identified as continuous structures within a contour, in the simulator's position-position-position (PPP) coordinate space and the observer's position-position-velocity space (PPV). Results indicate that the properties of the cloud populations are similar in both methods and up to 70 per cent of clouds have a single counterpart in the opposite data structure. Comparing individual clouds in a one-to-one match reveals a scatter in properties mostly within a factor of 2. However, the small variations in mass, radius and velocity dispersion produce significant differences in derived quantities such as the virial parameter. This makes it difficult to determine if a structure is truly gravitationally bound. The three cloud types originally found in the simulation in Fujimoto et al. are identified in both data sets, with around 80 per cent of the clouds retaining their type between identification methods. We also compared our results when using a peak decomposition method to identify clouds in both PPP and PPV space. The number of clouds increased with this technique, but the overall cloud properties remained similar. However, the more crowded environment lowered the ability to match clouds between techniques to 40 per cent. The three cloud types also became harder to separate, especially in the PPV data set. The method used for cloud identification therefore plays a critical role in determining cloud properties, but both PPP and PPV can potentially identify the same structures.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Pettitt2015,

title = {The morphology of the Milky Way - II. Reconstructing CO maps from disc galaxies with live stellar distributions},

author = {Alex Pettitt and Clare Dobbs and David Acreman and Matthew Bate},

url = {http://adsabs.harvard.edu/abs/2015MNRAS.449.3911P

https://www.youtube.com/watch?v=THVeoZf5FpA},

year  = {2015},

date = {2015-06-01},

journal = {MNRAS},

volume = { 449},

number = {4},

pages = {3911-3926},

abstract = {The arm structure of the Milky Way remains somewhat of an unknown, with observational studies hindered by our location within the Galactic disc. In the work presented here, we use smoothed particle hydrodynamics and radiative transfer to create synthetic longitude-velocity observations. Our aim is to reverse engineer a top-down map of the Galaxy by comparing synthetic longitude-velocity maps to those observed. We set up a system of N-body particles to represent the disc and bulge, allowing for dynamic creation of spiral features. Interstellar gas, and the molecular content, is evolved alongside the stellar system. A 3D-radiative transfer code is then used to compare the models to observational data. The resulting models display arm features that are a good reproduction of many of the observed emission structures of the Milky Way. These arms however are dynamic and transient, allowing for a wide range of morphologies not possible with standard density wave theory. The best-fitting models are a much better match than previous work using fixed potentials. They favour a four-armed model with a pitch angle of approximately 20°, though with a pattern speed that decreases with increasing Galactic radius. Inner bars are lacking, however, which appear required to fully reproduce the central molecular zone.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Haworth2015,

title = {Isolating signatures of major cloud-cloud collisions using position-velocity diagrams},

author = {Thomas Haworth and Elizabeth Tasker and Yasuo Fukui and Kazufumi Torii and Jim Dale and Kazuhiro Shima and Ken Takahira and Asao Habe and Kenji Hasegawa},

url = {http://adsabs.harvard.edu/abs/2015MNRAS.450...10H},

doi = {10.1093/mnras/stv639},

year  = {2015},

date = {2015-06-01},

journal = {MNRAS},

volume = {450},

pages = {10-20},

abstract = {Collisions between giant molecular clouds are a potential mechanism for triggering the formation of massive stars, or even super star clusters. The trouble is identifying this process observationally and distinguishing it from other mechanisms. We produce synthetic position-velocity diagrams from models of cloud-cloud collisions, non-interacting clouds along the line of sight, clouds with internal radiative feedback and a more complex cloud evolving in a galactic disc, to try and identify unique signatures of collision. We find that a broad bridge feature connecting two intensity peaks, spatially correlated but separated in velocity, is a signature of a high-velocity cloud-cloud collision. We show that the broad bridge feature is resilient to the effects of radiative feedback, at least to around 2.5 Myr after the formation of the first massive (ionizing) star. However for a head-on 10 km s-1 collision, we find that this will only be observable from 20 to 30 per cent of viewing angles. Such broad-bridge features have been identified towards M20, a very young region of massive star formation that was concluded to be a site of cloud-cloud collision by Torii et al., and also towards star formation in the outer Milky Way by Izumi et al.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Tasker2015,

title = {Star Formation in Disk Galaxies. III. Does Stellar Feedback Result in Cloud Death?},

author = {Elizabeth Tasker and James Wadsley and Ralph Pudritz},

url = {http://adsabs.harvard.edu/abs/2015ApJ...801...33T},

doi = {10.1088/0004-637X/801/1/33},

year  = {2015},

date = {2015-03-00},

journal = {The Astrophysical Journal},

volume = {801},

number = {1},

pages = {14},

abstract = {Stellar feedback, star formation, and gravitational interactions are major controlling forces in the evolution of giant molecular clouds (GMCs). To explore their relative roles, we examine the properties and evolution of GMCs forming in an isolated galactic disk simulation that includes both localized thermal feedback and photoelectric heating. The results are compared with the three previous simulations in this series, which consists of a model with no star formation, star formation but no form of feedback, and star formation with photoelectric heating in a set with steadily increasing physical effects. We find that the addition of localized thermal feedback greatly suppresses star formation but does not destroy the surrounding GMC, giving cloud properties closely resembling the run in which no stellar physics is included. The outflows from the feedback reduce the mass of the cloud but do not destroy it, allowing the cloud to survive its stellar children. This suggests that weak thermal feedback such as the lower bound expected for a supernova may play a relatively minor role in the galactic structure of quiescent Milky-Way-type galaxies, compared to gravitational interactions and disk shear.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2015PASJ...67...63O,

title = {Cosmic evolution of bars in simulations of galaxy formation},

author = {Takashi {Okamoto} and Mari {Isoe} and Asao {Habe}},

url = {https://ui.adsabs.harvard.edu/abs/2015PASJ...67...63O/abstract},

doi = {10.1093/pasj/psv037},

year  = {2015},

date = {2015-01-01},

journal = {Publications of the ASJ},

volume = {67},

number = {4},

pages = {63},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2015MNRAS.450L...6S,

title = {The impact of dust in host galaxies on quasar luminosity functions.},

author = {H {Shirakata} and T {Okamoto} and M {Enoki} and M {Nagashima} and M ~A ~R {Kobayashi} and T {Ishiyama} and R {Makiya}},

url = {https://ui.adsabs.harvard.edu/abs/2015MNRAS.450L...6S/abstract},

doi = {10.1093/mnrasl/slv035},

year  = {2015},

date = {2015-01-01},

journal = {Monthly Notices of the RAS},

volume = {450},

pages = {L6-L10},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2015PASJ...67...62T,

title = {A new ray-tracing scheme for 3D diffuse radiation transfer on highly parallel architectures},

author = {Satoshi {Tanaka} and Kohji {Yoshikawa} and Takashi {Okamoto} and Kenji {Hasegawa}},

url = {https://ui.adsabs.harvard.edu/abs/2015PASJ...67...62T/abstract},

doi = {10.1093/pasj/psv027},

year  = {2015},

date = {2015-01-01},

journal = {Publications of the ASJ},

volume = {67},

number = {4},

pages = {62},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2014MNRAS.445L.109I,

title = {Formation of an embryonic supermassive star in the first galaxy},

author = {Kohei Inayoshi and Kazuyuki Omukai and Elizabeth Tasker},

url = {http://adsabs.harvard.edu/abs/2014MNRAS.445L.109I},

doi = {10.1093/mnrasl/slu151},

year  = {2014},

date = {2014-11-00},

journal = {Monthly Notices of the Royal Astronomical Society: Letters},

volume = {445},

pages = {L109-L113},

abstract = {We studied the gravitational collapse of a warm (˜8000 K) primordial-gas cloud as a candidate progenitor for a supermassive star (SMS; ≳ 105 M⊙) using a three-dimensional hydrodynamical simulation including all the relevant cooling processes of both H2 and H, which can potentially induce cloud fragmentation. This is the first simulation of this kind to resolve protostar formation. We find that from a weakly turbulent initial condition, the cloud undergoes runaway collapse without a major episode of fragmentation. Although the H2 fraction jumps by a large factor via the three-body reaction at ˜10-13 g cm-3, its cooling remains inefficient due to the optical thickness, and the temperature remains ≳ 3000 K. When the central core of the cloud becomes opaque to continuum radiation at ˜10-8 g cm-3, a hydrostatic protostar with ≃0.2 M⊙ is formed. The protostar grows to the mass ≃1 M⊙ and the radius ≃2 au within ˜1 yr via rapid accretion of dense filamentary flows. With high accretion rate, ˜2 M⊙ yr-1, the protostar is expected to turn into an SMS within its lifetime, eventually collapsing to a seed for the supermassive black hole observed in the early Universe at z ˜ 7.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fujimoto2014b,

title = {Environmental dependence of star formation induced by cloud collisions in a barred galaxy},

author = {Yusuke Fujimoto and Elizabeth Tasker and Asao Habe},

url = {http://adsabs.harvard.edu/abs/2014MNRAS.445L..65F},

doi = {10.1093/mnrasl/slu138},

year  = {2014},

date = {2014-11-00},

journal = {Monthly Notices of the Royal Astronomical Society: Letters},

volume = {445},

number = {1},

pages = {65-69},

abstract = {Cloud collision has been proposed as a way to link the small-scale star formation process with the observed global relation between the surface star formation rate and gas surface density. We suggest that this model can be improved further by allowing the productivity of such collisions to depend on the relative velocity of the two clouds. Our adjustment implements a simple step function that results in the most successful collisions being at the observed velocities for triggered star formation. By applying this to a high-resolution simulation of a barred galaxy, we successfully reproduce the observational result that the star formation efficiency (SFE) in the bar is lower than that in the spiral arms. This is not possible when we use an efficiency dependent on the internal turbulence properties of the clouds. Our results suggest that high-velocity collisions driven by the gravitational pull of the clouds are responsible for the low bar SFE.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Takahira2014,

title = {Do Cloud-Cloud Collisions Trigger High-mass Star Formation? I. Small Cloud Collisions},

author = {Ken Takahira and Elizabeth Tasker and Asao Habe},

url = {http://adsabs.harvard.edu/abs/2014ApJ...792...63T},

doi = {10.1088/0004-637X/792/1/63},

year  = {2014},

date = {2014-09-01},

journal = {ApJ},

volume = {792},

abstract = {We performed sub-parsec (~0.06 pc) scale simulations of two idealized molecular clouds with different masses undergoing a collision. Gas clumps with densities greater than 10–20 g cm–3 (0.3 × 104 cm–3) were identified as pre-stellar cores and tracked throughout the simulation. The colliding system showed a partial gas arc morphology with core formation in the oblique shock front at the collision interface. These characteristics support NANTEN observations of objects suspected to be colliding giant molecular clouds (GMCs). We investigated the effect of turbulence and collision speed on the resulting core population and compared the cumulative mass distribution to cores in observed GMCs. Our results suggest that a faster relative velocity increases the number of cores formed but that cores grow via accretion predominately while in the shock front, leading to a slower shock being more important for core growth. The core masses obey a power-law relation with index γ = –1.6, in good agreement with observations. This suggests that core production through collisions should follow a similar mass distribution as quiescent formation, albeit at a higher mass range. If cores can be supported against collapse during their growth, then the estimated ram pressure from gas infall is of the right order to counter the radiation pressure and form a star of 100 M ☉.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Shirakata2014,

title = {The impact of dust in host galaxies on quasar luminosity functions},

author = {Hikari Shirakata and Takashi Okamoto and Motohiro Enoki and Masahiro Nagashima and Masakazu Kobayashi and Tomoaki Ishiyama and Ryu Makiya},

url = {http://adsabs.harvard.edu/abs/2015MNRAS.450L...6S},

doi = {10.1093/mnrasl/slv035},

year  = {2014},

date = {2014-06-00},

journal = {Monthly Notices of the Royal Astronomical Society: Letters},

volume = {450},

number = {1},

pages = {6-10},

abstract = {We have investigated effects of dust attenuation on quasar luminosity functions at z ˜ 2 using a semi-analytic galaxy formation model combined with a large cosmological N-body simulation. We estimate the dust attenuation of quasars self-consistently with that of galaxies by considering the dust in their host bulges. We find that the luminosity of the bright quasars is strongly dimmed by the dust attenuation, ˜2 mag in the B-band. Assuming the empirical bolometric corrections for active galactic nuclei (AGNs) by Marconi et al., we find that this dust attenuation is too strong to explain the B-band and X-ray quasar luminosity functions simultaneously. We consider two possible mechanisms that weaken the dust attenuation. As such a mechanism, we introduce a time delay for AGN activity, that is, gas fuelling to a central black hole starts sometime after the beginning of the starburst induced by a major merger. The other is the anisotropy in the dust distribution. We find that in order to make the dust attenuation of the quasars negligible, either the gas accretion into the black holes has to be delayed at least three times the dynamical time-scale of their host bulges or the dust covering factor is as small as ˜0.1.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Gnedin2014,

title = {Emergence of the Kennicutt-Schmidt Relation from the Small-scale SFR-Density Relation},

author = {Nickolay Gnedin and Elizabeth Tasker and Yusuke Fujimoto},

url = {http://adsabs.harvard.edu/abs/2014ApJ...787L...7G},

doi = {10.1088/2041-8205/787/1/L7},

year  = {2014},

date = {2014-05-01},

journal = {ApJL},

volume = {787},

abstract = {We use simulations of isolated galaxies with a few parsec resolution to explore the connection between the small-scale star formation rate (SFR)-gas density relation and the induced large-scale correlation between the SFR surface density and the surface density of the molecular gas (the Kennicutt-Schmidt relation). We find that, in the simulations, a power-law small-scale "star formation law" directly translates into an identical power-law Kennicutt-Schmidt relation. If this conclusion holds in the reality as well, it implies that the observed approximately linear Kennicutt-Schmidt relation must reflect the approximately linear small-scale "star formation law."},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Fujimoto2014,

title = {Do giant molecular clouds care about the galactic structure?},

author = {Yusuke Fujimoto and Elizabeth Tasker and Mariko Wakayama and Asao Habe},

url = {http://adsabs.harvard.edu/abs/2014MNRAS.439..936F},

year  = {2014},

date = {2014-03-01},

journal = {MNRAS},

volume = {439},

number = {1},

pages = {936-953},

abstract = {We investigate the impact of galactic environment on the properties of simulated giant molecular clouds (GMCs) formed in an M83-type barred spiral galaxy. Our simulation uses a rotating stellar potential to create the grand design features and resolves down to 1.5 pc. From the comparison of clouds found in the bar, spiral and disc regions, we find that the typical GMC is environment independent, with a mass of 5 × 105 M⊙ and radius 11 pc. However, the fraction of clouds in the property distribution tails varies between regions, with larger, more massive clouds with a higher velocity dispersion being found in greatest proportions in the bar, spiral and then disc. The bar clouds also show a bimodality that is not reflected in the spiral and disc clouds except in the surface density, where all three regions show two distinct peaks. We identify these features as being due to the relative proportion of three cloud types, classified via the mass-radius scaling relation, which we label A, B and C. Type A clouds have the typical values listed above and form the largest fraction in each region. Type B clouds are massive giant molecular associations (GMAs) while type C clouds are unbound, transient clouds that form in dense filaments and tidal tails. The fraction of each clouds type depends on the cloud-cloud interactions, which cause mergers to build up the GMA type Bs and tidal features in which the type C clouds are formed. The number of cloud interactions is greatest in the bar, followed by the spiral, causing a higher fraction of both cloud types compared to the disc. While the cloud types also exist in lower resolution simulations, their identification becomes more challenging as they are not well-separated populations on the mass-radius relation or distribution plots. Finally, we compare the results for three star formation models to estimate the star formation rate and efficiency in each galactic region.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2014PASJ...66...46H,

title = {Wide-field $^12$CO (J = 1-0) imaging of the nearby barred galaxy M 83 with NMA and Nobeyema 45 m telescope: Mole cular gas kinematics and star formation along the bar},

author = {Akihiko {Hirota} and Nario {Kuno} and Junichi {Baba} and Fumi {Egusa} and Asao {Habe} and Kazuyuki {Muraoka} and Ayako {Tanaka} and Hiroyuki {Nakanishi} and Ryohei {Kawabe}},

url = {https://ui.adsabs.harvard.edu/abs/2014PASJ...66...46H/abstract},

doi = {10.1093/pasj/psu006},

year  = {2014},

date = {2014-01-01},

journal = {Publications of the ASJ},

volume = {66},

number = {2},

pages = {46},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2014AJ....147..141H,

title = {ALMA View of G0.253+0.016: Can Cloud-Cloud Collision form the Cloud?},

author = {Aya E {Higuchi} and James O {Chibueze} and Asao {Habe} and Ken {Takahira} and Shuro {Takano}},

url = {https://ui.adsabs.harvard.edu/abs/2014AJ....147..141H/abstract},

doi = {10.1088/0004-6256/147/6/141},

year  = {2014},

date = {2014-01-01},

journal = {Astronomical Journal},

volume = {147},

number = {6},

pages = {141},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2014ApJ...780L..18I,

title = {ALMA Will Determine the Spectroscopic Redshift z > 8 with FIR [O III] Emission Lines},

author = {A ~K {Inoue} and I {Shimizu} and Y {Tamura} and H {Matsuo} and T {Okamoto} and N {Yoshida}},

url = {https://ui.adsabs.harvard.edu/abs/2014ApJ...780L..18I/abstract},

doi = {10.1088/2041-8205/780/2/L18},

year  = {2014},

date = {2014-01-01},

journal = {Astrophysical Journal, Letters},

volume = {780},

number = {2},

pages = {L18},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2014MNRAS.440..731S,

title = {Physical properties of UDF12 galaxies in cosmological simulations},

author = {Ikkoh {Shimizu} and Akio K {Inoue} and Takashi {Okamoto} and Naoki {Yoshida}},

url = {https://ui.adsabs.harvard.edu/abs/2014MNRAS.440..731S/abstract},

doi = {10.1093/mnras/stu265},

year  = {2014},

date = {2014-01-01},

journal = {Monthly Notices of the RAS},

volume = {440},

number = {1},

pages = {731-745},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{2014PASJ...66...70O,

title = {Reproducing cosmic evolution of galaxy population from z = 4 to 0},

author = {Takashi {Okamoto} and Ikkoh {Shimizu} and Naoki {Yoshida}},

url = {https://ui.adsabs.harvard.edu/abs/2014PASJ...66...70O/abstract},

doi = {10.1093/pasj/psu046},

year  = {2014},

date = {2014-01-01},

journal = {Publications of the ASJ},

volume = {66},

number = {4},

pages = {70},

keywords = {},

pubstate = {published},

tppubtype = {article}

}