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SPLASH: the Southern Parkes Large-Area Survey in Hydroxyl – first science from the pilot region

Authors :
Cormac Purcell
Courtney Jones
Andrew Walsh
John M. Dickey
Yasuo Fukui
Maria Cunningham
José-Luis Gómez
Paul Jones
Simon Ellingsen
Shari Breen
Naomi McClure-Griffiths
Steven J. Gibson
Ettore Carretti
Vicki Lowe
Takahiro Hayakawa
Akira Mizuno
Patrick Hennebelle
J. A. Green
Hiroshi Imai
Joanne Dawson
N. Lo
James Caswell
V. Krishnan
Microbiology Department
St. Jame's Hospital
Swinburne University of Technology (Hawthorn campus)
University of New South Wales [Sydney] (UNSW)
School of Mathematics and Physics
University of Tasmania [Hobart, Australia] (UTAS)
Laboratoire d'études spatiales et d'instrumentation en astrophysique (LESIA)
Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
Unidad de Glaciología y Recursos Hídricos
Astrophysique Interprétation Modélisation (AIM (UMR_7158 / UMR_E_9005 / UM_112))
Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris Diderot - Paris 7 (UPD7)
Observatoire de Paris - Site de Paris (OP)
Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris
Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)
Department of Materials Science and Engineering
Nagoya Institute of Technology
Department of Astrophysics [Nagoya]
Nagoya University
Institute for Space-Earth Environmental Research [Nagoya] (ISEE)
Astrophysique Interprétation Modélisation (AIM (UMR7158 / UMR_E_9005 / UM_112))
Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS)
Source :
Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2014, 439 (2), pp.1596-1614. ⟨10.1093/mnras/stu032⟩, Artículos CONICYT, CONICYT Chile, instacron:CONICYT, Monthly Notices of the Royal Astronomical Society, 2014, 439 (2), pp.1596-1614. ⟨10.1093/mnras/stu032⟩
Publication Year :
2014
Publisher :
HAL CCSD, 2014.

Abstract

SPLASH (the Southern Parkes Large-Area Survey in Hydroxyl) 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 ISM, 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 degrees and latitudes of -2 to +2 degrees. 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 LTE common even in the 1665- and 1667-MHz main lines. To a 3$\sigma$ 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.<br />Comment: 20 pages, 9 figures, accepted for publication in MNRAS

Details

Language :
English
ISSN :
00358711 and 13652966
Database :
OpenAIRE
Journal :
Monthly Notices of the Royal Astronomical Society, Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2014, 439 (2), pp.1596-1614. ⟨10.1093/mnras/stu032⟩, Artículos CONICYT, CONICYT Chile, instacron:CONICYT, Monthly Notices of the Royal Astronomical Society, 2014, 439 (2), pp.1596-1614. ⟨10.1093/mnras/stu032⟩
Accession number :
edsair.doi.dedup.....8bbbbd115a12215d32c832d4fb3d39ac
Full Text :
https://doi.org/10.1093/mnras/stu032⟩