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dc.contributor.authorDawson, J.
dc.contributor.authorWalsh, Andrew
dc.contributor.authorJones, P.
dc.contributor.authorBreen, S.
dc.contributor.authorCunningham, M.
dc.contributor.authorLowe, V.
dc.contributor.authorJones, C.
dc.contributor.authorPurcell, C.
dc.contributor.authorCaswell, J.
dc.contributor.authorCarretti, E.
dc.contributor.authorMcClure-Griffiths, N.
dc.contributor.authorEllingsen, S.
dc.contributor.authorGreen, J.
dc.contributor.authorGómez, J.
dc.contributor.authorKrishnan, V.
dc.contributor.authorDickey, J.
dc.contributor.authorImai, H.
dc.contributor.authorGibson, S.
dc.contributor.authorHennebelle, P.
dc.contributor.authorLo, N.
dc.contributor.authorHayakawa, T.
dc.contributor.authorFukui, Y.
dc.contributor.authorMizuno, A.
dc.date.accessioned2017-01-30T12:37:45Z
dc.date.available2017-01-30T12:37:45Z
dc.date.created2014-04-16T20:00:56Z
dc.date.issued2014
dc.identifier.citationDawson, J.R. and Walsh, A.J. and Jones, P.A. and Breen, S.L. and Cunningham, M.R. and Lowe, V. and Jones, C. and Purcell, C. and Caswell, J.L. and Carretti, E. and McClure-Griffiths, N.M and Ellingsen, S.P. and Green, J.A. and Gómez, J.F. and Krishnan, V. and Dickey, J.M. and Imai, H. and Gibson, S.J. and Hennebelle, P. and Lo, N. and Hayakawa, T. and Fukui, Y. and Mizuno, A. 2014. SPLASH: the Southern Parkes Large-Area Survey in Hydroxyl – first science from the pilot region. Monthly Notices of the Royal Astronomical Society. 439 (2): pp. 1596-1614.
dc.identifier.urihttp://hdl.handle.net/20.500.11937/23538
dc.identifier.doi10.1093/mnras/stu032
dc.description.abstract

The Southern Parkes Large-Area Survey in Hydroxyl (SPLASH) is a sensitive, unbiased, and fully sampled survey of the southern Galactic plane and Galactic Centre in all four ground-state transitions of the hydroxyl (OH) radical. The survey provides a deep census of 1612-, 1665-, 1667-, and 1720-MHz OH absorption and emission from the Galactic interstellar medium, and is also an unbiased search for maser sources in these transitions. We present here first results from the SPLASH pilot region, which covers Galactic longitudes 334° to 344° and latitudes ±2?. Diffuse OH is widely detected in all four transitions, with optical depths that are always small (averaged over the Parkes beam), and with departures from local thermodynamic equilibrium common even in the 1665- and 1667-MHz main lines. To a 3σ sensitivity of ~30 mK, we find no evidence of OH envelopes extending beyond the CO-bright regions of molecular cloud complexes, and conclude that the similarity of the OH excitation temperature and the level of the continuum background is at least partly responsible for this. We detect masers and maser candidates in all four transitions, approximately 50 per cent of which are new detections. This implies that SPLASH will produce a substantial increase in the known population of ground-state OH masers in the southern Galactic plane.

dc.publisherOxford University Press
dc.subjectGalaxy: disc
dc.subjectISM: molecules
dc.subjectmasers
dc.subjectsurveys
dc.subjectradio lines: ISM
dc.titleSPLASH: the Southern Parkes Large-Area Survey in Hydroxyl – first science from the pilot region
dc.typeJournal Article
dcterms.source.volume439
dcterms.source.number2
dcterms.source.startPage1596
dcterms.source.endPage1614
dcterms.source.issn0035-8711
dcterms.source.titleMonthly Notices of the Royal Astronomical Society
curtin.note

This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society. ©: 2014 The Authors, Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

curtin.department
curtin.accessStatusOpen access


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