The galactic bulge survey: Completion of the X-ray survey observations

Peter G. Jonker, Manuel A.P. Torres, Robert I. Hynes, Thomas J. Maccarone, Danny Steeghs, Sandra Greiss, Christopher T. Britt, Jianfeng Wu, Christopher B. Johnson, Gijs Nelemans, Craig Heinke

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26 Scopus citations


We provide the Chandra source list for the last quarter of the area covered by the Galactic Bulge Survey (GBS). The GBS targets two strips of 6° × 1° (12 square degrees in total), one above (1° < b < 2°) and one below (-2° < b < -1°) the Galactic plane in the direction of the Galactic center at X-ray, optical, and near-infrared wavelengths. For the X-ray part of the survey we use 2 ks per Chandra pointing. We find 424 X-ray sources in the 63 Chandra observations on which we report here. These sources are in addition to the 1216 X-ray sources discovered in the first part of the GBS survey described previously. We discuss the characteristics and the X-ray variability of the brightest of the sources as well as the radio properties from existing radio surveys. We point out an interesting asymmetry in the number of X-ray sources as a function of their Galactic l and b coordinates which is probably caused by differences in average extinction toward the different parts of the GBS survey area.

Original languageEnglish
Article number18
JournalAstrophysical Journal, Supplement Series
Issue number2
StatePublished - Feb 2014


  • X-rays: binaries
  • accretion, accretion disks
  • binaries: symbiotic
  • novae, cataclysmic variables
  • stars: activity


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