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OH as a Probe of The Milky Way's Hidden Gas: First Results from SPLASH

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

Published online by Cambridge University Press:  12 September 2016

J. R. Dawson ,
A. J. Walsh  and
The SPLASH Team
J. R. Dawson
Affiliation:
Department of Physics and Astronomy and MQ Research Centre in Astronomy, Astrophysics and Astrophotonics, Macquarie University, NSW 2109, Australia email: joanne.dawson@mq.edu.au CSIRO Astronomy and Space Science, P.O. Box 76, Epping, NSW 1710, Australia
A. J. Walsh
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA 6845, Australia email: andrew.walsh@curtin.edu.au
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Abstract

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SPLASH (the Southern Parkes Large-Area Survey in Hydroxyl) is a deep survey of ground-state OH absorption and emission from the Galactic Plane, as well as an unbiased search for OH masers. Key early results include the detection of a rich and complex distribution of diffuse, optically thin OH with strongly non-thermal excitation temperatures, and the detection of numerous new maser sources. The survey aims to use OH as a probe of CO-dark H2 ISM Galactic scales, with future plans including comprehensive comparisons with CO and Hi, as well as non-LTE excitation modelling of the four ground-state lines.

Keywords

ISM: cloudsISM: evolutionISM: moleculesmaserssurveys

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