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SPLASH: the Southern Parkes Large-Area Survey in Hydroxyl – first science from the pilot region
- 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
- Subjects :
- Physics
[PHYS]Physics [physics]
education.field_of_study
Splash
Molecular cloud
Population
Astronomy
FOS: Physical sciences
Astronomy and Astrophysics
Astrophysics
Excitation temperature
Astrophysics::Cosmology and Extragalactic Astrophysics
Galactic plane
Astrophysics - Astrophysics of Galaxies
Galaxy
law.invention
Space and Planetary Science
law
Astrophysics of Galaxies (astro-ph.GA)
Maser
education
[PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Astrophysics::Galaxy Astrophysics
ComputingMilieux_MISCELLANEOUS
Subjects
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⟩