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

Shinya Komugi·Kotaro Kohno·Tomoka Tosaki·Hiroyuki Nakanishi·Sachiko Onodera·Fumi Egusa·Yoshiaki Sofue
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Abstract

Star formation rates (SFRs) obtained via extinction corrected H alpha are compared to dense gas as traced by CO(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 1.0. The correlation is also compared between gas traced by CO(J=1-0) and application of H alpha extinction correction. We find that dense gas produces a far better correlation with SFR in view of surface density values.

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Shinya Komugi, Kotaro Kohno, Tomoka Tosaki, Hiroyuki Nakanishi, Sachiko Onodera, Fumi Egusa, Yoshiaki Sofue. 2006-10-25. ASTE observations of nearby galaxies: A tight correlation between CO(J=3-2) emission and Halpha. https://doi.org/10.1093/pasj%2F59.1.55

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