1. SPATIALLY RESOLVED CHEMISTRY IN NEARBY GALAXIES. III. DENSE MOLECULAR GAS IN THE INNER DISK OF THE LIRG IRAS 04296+2923
- Author
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Sara C. Beck, Jean L. Turner, and David S. Meier
- Subjects
Astrochemistry ,FOS: Physical sciences ,Astrophysics ,Astronomy & Astrophysics ,Atomic ,Physical Chemistry ,chemistry.chemical_compound ,Particle and Plasma Physics ,Isotopologue ,Nuclear ,Ejecta ,Physics ,Luminous infrared galaxy ,ISM [galaxies] ,Star formation ,astrochemistry ,starburst [galaxies] ,individual [galaxies] ,individual (IRAS 04296+2923 [galaxies] ,Molecular ,Astronomy and Astrophysics ,Astrophysics - Astrophysics of Galaxies ,Galaxy ,galaxies [radio lines] ,Stars ,individual (IRAS 04296+2923, 2MASX J04324860+2929578) [galaxies] ,chemistry ,2MASX J04324860+2929578) ,13. Climate action ,Space and Planetary Science ,Astrophysics of Galaxies (astro-ph.GA) ,Astronomical and Space Sciences ,Carbon monoxide ,Physical Chemistry (incl. Structural) - Abstract
We present a survey of 3 mm molecular lines in IRAS 04296+2923, one of the brightest known molecular-line emitting galaxies, and one of the closest LIRGs. Data are from the Owens Valley and CARMA millimeter interferometers. Species detected at ~10 M_sun/yr and is traced by lines of HCN, HCO+, HNC, and CN. A correlation between HCN and star formation rate is observed on sub-kpc scales, consistent with global relations. Toward the nucleus, CN abundances are similar to those of HCN, indicating emission comes from a collection (~40-50) of moderate visual extinction, photon-dominated region clouds. The CO isotopic line ratios are unusual: CO(1-0)/^13CO(1-0) and CO(1-0)/C^18O(1-0) line ratios are large toward the starburst, as is commonly observed in LIRGs, but farther out in the disk these ratios are remarkably low (~, 15 pages, 5 figures; Accepted for publication in the Astrophysical Journal
- Published
- 2014