Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-09T03:44:34.991Z Has data issue: false hasContentIssue false
  • English
  • Français

Detection of new sources of 4765-MHz OH masing

Published online by Cambridge University Press:  03 August 2017

Richard G. Dodson  and
Simon P. Ellingsen
Richard G. Dodson
Affiliation:
School of Mathematics and Physics, University of Tasmania, GPO Box 252-21, Hobart, Tasmania 7001, Australia
Simon P. Ellingsen
Affiliation:
School of Mathematics and Physics, University of Tasmania, GPO Box 252-21, Hobart, Tasmania 7001, Australia

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

We have used the Australia Telescope Compact Array (ATCA) to make a sensitive search for maser emission from the 4765-MHz transition of OH towards a sample of 55 star formation regions. Maser emission with peak flux densities in excess of 100 mJy were detected in 14 sites, with 10 of these being new discoveries. Unlike the ground-state OH transitions the 4765-MHz transition is not predicted to be circularly polarised and none of the masers observed have detectable levels of linear, or circular polarisation. Combining our results with those of previous high resolution observations of other OH transitions we are able to investigate various theoretical models for the pumping of OH masers.

Type
Part 1. Star Formation
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 112 - 115
Copyright
Copyright © Astronomical Society of the Pacific 2002 

References

Caswell, J. L. 1997, MNRAS, 289, 203 CrossRefGoogle Scholar
Caswell, J. L. 1998, MNRAS, 297, 215 CrossRefGoogle Scholar
Caswell, J. L. 1999, MNRAS, 308, 683 CrossRefGoogle Scholar
Cohen, R. J., Masheder, M. R. W. & Caswell, J. L. 1995, MNRAS. 274, 808 CrossRefGoogle Scholar
Gardner, F. F., & Ribes, J. C. 1971, Astrophysical Letters, 9, 175 Google Scholar
Gray, M. D., Field, D., Doel, R. C., 1992, MNRAS, 262, 555 Google Scholar
MacLeod, G. C. 1997, MNRAS, 285, 635 CrossRefGoogle Scholar
Masheder, M.R.W., Field, D. Gray, M.D., Migenes, V., Cohen, R.J., Booth, R. S. 1994, A&A, 281, 871–881 Google Scholar
Palmer, P., Gardner, F. F. & Whiteoak, J. B. 1984, MNRAS, 211, 41P CrossRefGoogle Scholar
Pavlakis, K. G., Kylafis, N. D., 1996, ApJ, 467, 300 CrossRefGoogle Scholar
Smits, D. P. 1997, MNRAS, 287, 253 CrossRefGoogle Scholar
Zuckerman, B. & Palmer, P. 1970, ApJ, 159, L197 CrossRefGoogle Scholar