ASTE observations of nearby galaxies: A tight correlation between CO (J=3-2) emission and H alpha

作者：Komugi Shinya^*; Kohno Kotaro; Tosaki Tomoka; Nakanishi Hiroyuki; Onodera Sachiko; Egusa Fumi; Sofue Yoshiaki

来源：Publications of the Astronomical Society of Japan, 2007, 59(1): 55-60.

• galaxies : ISM
• galaxies : spiral
• ISM : molecules
• stars : formation

Star formation rates (SFRs) obtained via extinction-corrected Ha are compared to dense gas, as traced by (CO)-C-12 (J = 3-2) emission at the centers of nearby galaxies, observed with the ASTE telescope. It is found that, although many of the observed positions are dusty, and therefore heavily absorbed at H alpha, the SFR shows a striking correlation with dense gas in the form of the Schmidt law with an index of 1.0. The correlation is also compared between gas traced by (CO)-C-12 (J = 1-0) and the application of an Ha extinction correction. We find that dense gas produces a far-better correlation with SFR in view of the surface density values.

• 出版日期2007
• 单位中国科学院国家天文台