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2008MNRAS.390...49M - Mon. Not. R. Astron. Soc., 390, 49-58 (2008/October-2)
A search for OH 6 GHz maser emission towards supernova remnants.
McDONNELL K.E., WARDLE M. and VAUGHAN A.E.
Abstract (from CDS):
We present excitation calculations predicting the formation of 6049-MHz OH masers and results of a survey, using the Parkes Methanol Multibeam receiver for 6049-, 6035- and 6030-MHz OH masers toward 35 supernova remnants, a star-forming region and four fields in the Large and Small Magellanic Clouds.
Two new sites of 6035- and 6030-MHz OH-maser emission associated with star-forming regions have been discovered, but no 6049-MHz masers were detected to a brightness temperature limit of ∼0.3-0.6 K, even though modelling of the OH excitation suggests that maser emission should have been detected. Our upper limits indicate the OH column density for a typical remnant ≲1016.4/cm2, which conflicts with observed and modelled column densities. One possible explanation is that 6049-MHz OH masers may be more sensitive to velocity coherence than 1720-MHz OH masers under some conditions.
Abstract Copyright: © 2008 The Authors. Journal compilation © 2008 RAS
Journal keyword(s): masers - stars: formation - supernova remnants - radio lines: ISM
Simbad objects: 44
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