Affiliation:
1. University of Western Sydney, Penrith South, Australia
Abstract
We present Data Release 2 of the Point Source Catalogue created from a series
of previously constructed radio-continuum images of M31 at ?=20 cm (v=1.4
GHz) from archived VLA observations. In total, we identify a collection of
916 unique discrete radio sources across the field of M31. Comparing these
detected sources to those listed by Gelfand et al. (2004) at ?=92 cm, the
spectral index of 98 sources has been derived. The majority (73%) of these
sources exhibit a spectral index of ?<-0.6, indicating that their emission is
predominantly non-thermal in nature, which is typical for background objects
and Supernova Remnants (SNRs). Additionally, we investigate the presence of
radio counterparts for some 156 SNRs and SNR candidates, finding a total of
only 13 of these objects in our images within a 500 search area. Auxiliary
optical, radio and X-ray catalogues were cross referenced highlighting a
small population of SNRs and SNR candidates common to multi frequency
domains.
Publisher
National Library of Serbia
Subject
Astronomy and Astrophysics
Cited by
18 articles.
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