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Groundstate OH masers associated with Herbig-Haro objects

Published online by Cambridge University Press:  01 March 2007

A. de Witt  and
D. P. Smits
A. de Witt
Affiliation:
Department of Mathematical Sciences, University of South Africa, Pretoria, 0003, South Africa email: aletdewitt@webmail.co.za, dps@astro.unisa.ac.za
D. P. Smits
Affiliation:
Department of Mathematical Sciences, University of South Africa, Pretoria, 0003, South Africa email: aletdewitt@webmail.co.za, dps@astro.unisa.ac.za
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Abstract

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Jets from newly-formed stars plow into the surrounding ISM, creating nebulous regions known as Herbig-Haro (HH) objects. Signatures of C-type shocks have been found in many HH objects. Models of shock-excited 1720-MHz OH masers associated with SNRs suggest that the masers could be signposts of C-type shocks. We have conducted a 1720MHz survey towards a number of HH objects to see if any shock-excited masers occur in association with these objects. Some results of our search are reported. When present, the 1720-MHz OH line can occur as emission, absorption or as P Cygni profiles. OH mainline emission is found in many of our sources. We have identified several potential 1720-, 1665- and 1667-MHz OH masers.

Keywords

ISM: Herbig-Haro objectsISM: jets and outflowsmasersline:profiles
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 172 - 175
Copyright
Copyright © International Astronomical Union 2008

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