Optical depth estimates and effective critical densities of dense gas tracers in the inner parts of nearby galaxy discs
Jimenez-Donaire, Maria J.; Bigiel, Frank; Leroy, Adam K; Cormier, Diane; Gallagher, Molly; Usero, Antonio; Bolatto, Alberto; Colombo, Dario; García-Burillo, Santiago; Hughes, Annie Meredith; Kramer, C.; Krumholz, Mark
High critical density molecular lines like HCN (1-0) or HCO+ (1-0) represent our best tool to study currently star-forming, dense molecular gas at extragalactic distances. The optical depth of these lines is a key ingredient to estimate the effective density required to excite emission. However, constraints on this quantity are even scarcer in the literature than measurements of the high-density tracers themselves. Here, we combine new observations of HCN, HCO+ and HNC(1-0) and their optically...[Show more]
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|Source:||Monthly Notices of the Royal Astronomical Society|
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