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Do Spectroscopic Dense Gas Fractions Track Molecular Cloud Surface Densities?

Gallagher, Molly; Leroy, Adam K.; Bigiel, Frank; Cormier, Diane; Jimenez-Donaire, Maria; Hughes, Annie; Pety, Jerome; Schinnerer, Eva; Sun, Jiayi; Usero, Antonio; Krumholz, Mark; Hughes, A.; Bolatto, Alberto; Meidt, Sharon E.; Meier, David


We use Atacama Large Millimeter/submillimeter Array and Institute for Radio Astronomy in the Millimeter 30 m telescope data to investigate the relationship between the spectroscopically traced dense gas fraction and the cloud-scale (120 pc) molecular gas surface density in five nearby, star-forming galaxies. We estimate the dense gas mass fraction at 650 and 2800 pc scales using the ratio of HCN (1−0) to CO (1−0) emission. We then use high-resolution (120 pc) CO (2−1) maps to calculate the...[Show more]

CollectionsANU Research Publications
Date published: 2018-11-30
Type: Journal article
Source: Astrophysical Journal Letters
DOI: 10.3847/2041-8213/aaf16a
Access Rights: Open Access


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