A wide-field, low-frequency radio image of the field of M31. II. Source classification and discussion

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

Research output: Contribution to journalReview article

Abstract

We have previously presented the results of a 325 MHz radio survey of M31, conducted with the A configuration of the Very Large Array. In this survey, a total of 405 radio sources between ≲6″ and 170″ in extent were mapped with a resolution of 6″ and a sensitivity of ∼0.6 mJy beam -1. Here we compare the resultant source list and image with other radio, IR, optical, and X-ray observations and catalogs of the region. Through this, we were able to identify five supernova remnant candidates and three pulsar wind nebula candidates in M31, as well as three Milky Way radio stars, a possible Milky Way planetary nebula, and a bevy of interesting extragalactic objects: a BL Lac, a giant radio galaxy, a galaxy merger, and several high-z radio galaxy candidates. In addition, a large number of compact (θ ≲ 6″) extremely steep-spectrum sources (α ≤ -1.6; S v ∝ V α) were detected whose nature is unknown.

Original languageEnglish (US)
Pages (from-to)242-276
Number of pages35
JournalAstrophysical Journal, Supplement Series
Volume159
Issue number2
DOIs
StatePublished - Aug 2005

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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