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Astrochemistry in external galaxies: how to use molecules as probes of their physical conditions

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Serena Viti
Serena Viti*
Affiliation:
Department of Physics and Astronomy, University College London, Gower St., London, WC1E 6BT, UK email: [email protected]
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Abstract

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It is now well established that chemistry in external galaxies is rich and complex. In this review I will explore whether one can use molecular emissions to determine their physical conditions. There are several considerations to bear in mind when using molecular emission, and in particular molecular ratios, to determine the densities, temperatures and energetics of a galaxy, which I will briefly summarise here. I will then present an example of a study that uses multiple chemical and radiative transfer analyses in order to tackle the too often neglected ‘degeneracies’ implicit in the interpretation of molecular ratios and show that only via such analyses combined with multi-species and multi-lines high spatial resolution data one can truly make molecules into powerful diagnostics of the evolution and distribution of molecular gas.

Keywords

astrochemistrygalaxies: ISMgalaxies: nucleigalaxies: individual (NGC 1068)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S315: From Interstellar Clouds to Star-Forming Galaxies: Universal Processes? , August 2015 , pp. 17 - 25
Copyright
Copyright © International Astronomical Union 2016 

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