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Molecular tracers of PDR-dominated galaxies

Bayet, E. and Viti, S. and Williams, D. A. and Rawlings, J. M. C. and Bell, T. (2009) Molecular tracers of PDR-dominated galaxies. Astrophysical Journal, 696 (2). pp. 1466-1477. ISSN 0004-637X.

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Photon-dominated regions (PDRs) are powerful molecular line emitters in external galaxies. They are expected in galaxies with high rates of massive star formation due to either starburst (SB) events or SB coupled with active galactic nuclei (AGNs) events. We have explored the PDR chemistry for a range of physical conditions representing a variety of galaxy types. Our main result is a demonstration of the sensitivity of the chemistry to changes in the physical conditions. We adopt crude estimates of relevant physical parameters for several galaxy types and use our models to predict suitable molecular tracers of those conditions. The set of recommended molecular tracers differs from that which we recommended for use in galaxies with embedded massive stars. Thus, molecular observations can in principle be used to distinguish between excitation by SB and by SB+AGN in distant galaxies. Our recommendations are intended to be useful in preparing Herschel and ALMA proposals to identify sources of excitation in galaxies.

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Additional Information:© 2009 American Astronomical Society. Print publication: Issue 2 (2009 May 10) Received 2008 November 12; accepted for publication 2009 February 23; published 2009 April 24. E.B. acknowledges financial support from the Leverhulme Trust.
Funding AgencyGrant Number
Leverhulme TrustUNSPECIFIED
Subject Keywords:astrochemistry; galaxies: active; ISM: abundances; ISM: molecules; methods: numerical; stars: formation
Issue or Number:2
Record Number:CaltechAUTHORS:20090617-095111023
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14401
Deposited By: Jason Perez
Deposited On:14 Aug 2009 16:23
Last Modified:03 Oct 2019 00:49

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