1. 20 cm VLA RADIO-CONTINUUM STUDY OF M31 -- IMAGES AND POINT SOURCE CATALOGUES.
- Author
-
Galvin, T. J., Filipović, M. D., Crawford, E. J., Tothill, N. F. H., Wong, G. F., and De Horta, A. Y.
- Subjects
- *
VERY large array telescopes , *IMAGING systems in astronomy , *RADIO astronomy , *INFORMATION processing , *HIGH resolution imaging , *ASTRONOMICAL photography - Abstract
We present a series of new high-sensitivity and high-resolution radio-continuum images of M31 at λ=20 cm (v=1.4 GHz). These new images were produced by merging archived 20 cm radio-continuum observations from the Very Large Array (VLA) telescope. Images presented here are sensitive to rms=60 µJy and feature high angular resolution (<10") . A complete sample of discrete radio sources have been catalogued and analysed across 17 individual VLA projects. We identified a total of 864 unique discrete radio sources across the field of M31. One of the most prominent regions in M31 is the ring feature for which we estimated total integrated flux of 706 mJy at λ=20 cm. We compare here detected sources to those listed in Gelfand et al. (2004) at λ=92 cm and find 118 sources in common to both surveys. The majority (61%) of these sources exhibit a spectral index of a<-0.6 indicating that their emission is predominantly non-thermal in nature, that is more typical for background objects. [ABSTRACT FROM AUTHOR]
- Published
- 2012
- Full Text
- View/download PDF