Physical properties of molecular gas in the barred spiral galaxy NGC 2903 (Muraoka et al. 2016, PASJ, 68, 89).

Molecular gas density controls the difference of star formation efficiency (SFE) deriving spatially resolved molecular gas density and kinetic temperature and comparing them with SFE.

Figure 3. Molecular gas density and SFE in NGC 2903. It shows relation between volume density and SFE, and indicates that molecular gas density, not its contents, correlates with SFE.

Transitions between atomic and molecular gas, diffuse and dense gas, gas and stars in the dwarf galaxy NGC 2976 (Hatakeyama et al. 2017, PASJ, 69, 67).

The molecular gas fraction depends on the surface densities of the total gas and the star formation rate, according to the main stellar disks of spiral galaxies.

Figure 4. Molecular gas fraction of NGC 2976 as a function of surface density of neutral gas and star formation rate (SFR).

Preliminary CO maps are shown with WISE 3.4 µm images.

Figure 5. Integrated intensity map of 12CO (rainbow) and WISE 3.4 µm map (red).