A wide-field, low-frequency radio survey of the field of M31. I. Construction and statistical analysis of the source catalog

Joseph D. Gelfand, T. Joseph W. Lazio, B. M. Gaensler

Research output: Contribution to journalArticlepeer-review

Abstract

We present here the results of a 325 MHz radio survey of M31, conducted with the A configuration of the Very Large Array. The survey covered an area of 7.6 deg 2, and a total of 405 radio sources between ≲6″ and 170″ in extent were mapped with a resolution of 6″ and a 1 σ sensitivity of ∼0.6 mJy beam -1. For each source, its morphological class, major axis θ M, minor axis θ m, position angle θ PA, peak flux I, integrated flux density S, spectral index α, and spectral curvature parameter φ were calculated. A comparison of the flux and radial distribution - both in the plane of the sky and in the plane of M31 - of these sources with those of the XMM-Newton Large-Scale Structure Survey and Westerbork Northern Sky Survey revealed that a vast majority of sources detected are background radio galaxies. As a result of this analysis, we expect that only a few sources are intrinsic to M31. These sources are identified and discussed in an accompanying paper.

Original languageEnglish (US)
Pages (from-to)89-100
Number of pages12
JournalAstrophysical Journal, Supplement Series
Volume155
Issue number1
DOIs
StatePublished - Nov 2004

Keywords

  • Catalogs
  • Galaxies: individual (M31)
  • Radio continuum: galaxies
  • Radio continuum: general

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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