OH as a probe of the Milky Way's hidden gas

first results from SPLASH

J. R. Dawson*, A. J. Walsh, SPLASH Team

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution


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 H-2 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.

Original languageEnglish
Title of host publicationFrom interstellar clouds to star-forming galaxies
Subtitle of host publicationuniversal processes?
EditorsPascale Jablonka, Philippe André, Floris van der Tak
Place of PublicationCambridge, UK
PublisherCambridge University Press
Number of pages2
ISBN (Print)9781107135208
Publication statusPublished - 2016
Event315th Symposium of the International Astronomical Union - Honolulu, United States
Duration: 3 Aug 20157 Aug 2015

Publication series

NameIAU Symposium Proceedings Series
ISSN (Print)1743-9213


Conference315th Symposium of the International Astronomical Union
CountryUnited States


  • ISM: clouds
  • ISM: evolution
  • ISM: molecules
  • masers
  • surveys

Cite this

Dawson, J. R., Walsh, A. J., & SPLASH Team (2016). OH as a probe of the Milky Way's hidden gas: first results from SPLASH. In P. Jablonka, P. André, & F. van der Tak (Eds.), From interstellar clouds to star-forming galaxies: universal processes? (pp. 1-2). (IAU Symposium Proceedings Series; Vol. 315). Cambridge, UK: Cambridge University Press. https://doi.org/10.1017/S174392131600778X