期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 681, 期 2, 页码 L77-L80出版社
UNIV CHICAGO PRESS
DOI: 10.1086/590342
关键词
galaxies : ISM; galaxies : starburst; ISM : molecules; radio lines : galaxies; radio lines : ISM; stars : formation
We investigate the relationship between the star formation rate (SFR) and dense molecular gas mass in the nuclei of galaxies. To do this, we utilize the observed 850 mu m luminosity as a proxy for the infrared luminosity (L-IR) and SFR, and we correlate this with the observed CO(J = 3-2) luminosity. We find tentative evidence that the L-IR-CO (J = 3-2) index is similar to the Kennicutt-Schmidt (KS) index (N approximate to 1.5) in the central similar to 1.7 kpc of galaxies, and it flattens to a roughly linear index when including emission from the entire galaxy. This result may imply that the volumetric Schmidt relation is the underlying driver behind the observed SFR-dense gas correlations, and it provides tentative confirmation for recent numerical models. While the data exclude the possibility of a constant L-IR-CO(J = 3-2) index for both galaxy nuclei and global measurements at the similar to 80% confidence level, the considerable error bars cannot preclude alternative interpretations.
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