20 cm VLA radio-continuum study of M31-images and point source catalogues DR2: Extraction of a supernova remnant sample
We present Data Release 2 of the Point Source Catalogue created from a series of previously constructed radio-continuum images of M31 at λ=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. Compa...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
Astronomical Observatory, Department of Astronomy, Belgrade
2014-01-01
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| Series: | Serbian Astronomical Journal |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-698X/2014/1450-698X1400002G.pdf |
| Summary: | We present Data Release 2 of the Point Source Catalogue created from a series
of previously constructed radio-continuum images of M31 at λ=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 λ=92 cm, the
spectral index of 98 sources has been derived. The majority (73%) of these
sources exhibit a spectral index of α<-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. |
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| ISSN: | 1450-698X 1820-9289 |