Radio sources in the Chandra Galactic Bulge Survey

Thomas J. MacCarone, Manuel A.P. Torres, Christopher T. Britt, Sandra Greiss, Robert I. Hynes, Peter G. Jonker, Danny Steeghs, Rudy Wijnands, Gijs Nelemans

Research output: Contribution to journalArticlepeer-review

21 Scopus citations


We discuss radio sources in the Chandra Galactic Bulge Survey region. By cross-matching the X-ray sources in this field with the NRAO VLA Sky Survey archival data, we find 12 candidate matches. We present a classification scheme for radio/X-ray matches in surveys taken in or near the Galactic plane, taking into account other multiwavelength data. We show that none of the matches found here is likely to be due to coronal activity from normal stars because the radio to X-ray flux ratios are systematically too high. We show that one of the source could be a radio pulsar, and that one could be a planetary nebula, but that the bulk of the sources are likely to be background active galactic nuclei (AGN), with many confirmed through a variety of approaches. Several of the AGN are bright enough in the near-infrared (and presumably in the optical) to use as probes of the interstellar medium in the inner Galaxy.

Original languageEnglish
Pages (from-to)3057-3069
Number of pages13
JournalMonthly Notices of the Royal Astronomical Society
Issue number4
StatePublished - Nov 11 2012


  • Galaxies: active
  • Galaxy: bulge
  • Radio continuum: stars
  • X-rays: stars


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