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Title: Near-infrared counterparts to the Galactic Bulge Survey X-ray source population
Authors: Greiss, S ×
Steeghs, D
Jonker, P. G
Torres, M. A. P
Maccarone, T. J
Hynes, R. I
Britt, C. T
Nelemans, Gijs
Gaensicke, B. T #
Issue Date: Mar-2014
Publisher: Priestley and Weale
Series Title: Monthly Notices of the Royal Astronomical Society vol:438 issue:4 pages:2839-2852
Abstract: We report on the near-infrared matches, drawn from three surveys, to the 1640 unique X-ray sources detected by Chandra in the Galactic Bulge Survey (GBS). This survey targets faint X-ray sources in the bulge, with a particular focus on accreting compact objects. We present all viable counterpart candidates and associate a false alarm probability (FAP) to each near-infrared match in order to identify the most likely counterparts. The FAP takes into account a statistical study involving a chance alignment test, as well as considering the positional accuracy of the individual X-ray sources. We find that although the star density in the bulge is very high, ˜90 per cent of our sources have an FAP <10 per cent, indicating that for most X-ray sources, viable near-infrared counterparts candidates can be identified. In addition to the FAP, we provide positional and photometric information for candidate counterparts to ˜95 per cent of the GBS X-ray sources. This information in combination with optical photometry, spectroscopy and variability constraints will be crucial to characterize and classify secure counterparts.
ISSN: 0035-8711
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Institute of Astronomy
× corresponding author
# (joint) last author

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