publication . Article . Preprint . 2017

Optical depth estimates and effective critical densities of dense gas tracers in the inner parts of nearby galaxy discs

Jiménez-Donaire, M.; Bigiel, F.; Leroy, A.; Cormier, D.; Gallagher, M.; Usero, A.; Bolatto, A.; Colombo, D.; Garcia-Burillo, S.; Hughes, A.; ...
Open Access English
  • Published: 03 Jan 2017
  • Publisher: HAL CCSD
  • Country: France
Abstract
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 thin isotopologues H13CN, H13CO+ and HN13C(1-0) to measure isotopologue line ratios. We use IRAM 30-m observations from the large program EMPIRE and new ALMA observations, w...
Subjects
free text keywords: [PHYS]Physics [physics], [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Astrophysics - Astrophysics of Galaxies, Space and Planetary Science, Astronomy and Astrophysics, Physics, Optical depth, Stacking, High density, Astrophysics, Galaxy, Astronomy, Atomic physics, Isotopologue, Effective density
Funded by
NSERC
Project
  • Funder: Natural Sciences and Engineering Research Council of Canada (NSERC)
,
ARC| Discovery Projects - Grant ID: DP160100695
Project
  • Funder: Australian Research Council (ARC) (ARC)
  • Project Code: DP160100695
  • Funding stream: Discovery Projects
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publication . Article . Preprint . 2017

Optical depth estimates and effective critical densities of dense gas tracers in the inner parts of nearby galaxy discs

Jiménez-Donaire, M.; Bigiel, F.; Leroy, A.; Cormier, D.; Gallagher, M.; Usero, A.; Bolatto, A.; Colombo, D.; Garcia-Burillo, S.; Hughes, A.; ...