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Near-infrared counterparts to the Galactic Bulge Survey X-ray source population
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Greiss, Sandra, Steeghs, D., Jonker, P. G., Torres, M. A. P., Maccarone, T. J., Hynes, R. I., Britt, C. T., Nelemans, G. and Gänsicke, B. T. (Boris T.) (2014) Near-infrared counterparts to the Galactic Bulge Survey X-ray source population. Monthly Notices of the Royal Astronomical Society, Volume 438 (Number 4). pp. 2839-2852. doi:10.1093/mnras/stt2390 ISSN 0035-8711.
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Official URL: http://dx.doi.org/10.1093/mnras/stt2390
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.
Item Type: | Journal Article | ||||||||||
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Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||
Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||
Publisher: | Oxford University Press | ||||||||||
ISSN: | 0035-8711 | ||||||||||
Official Date: | 11 March 2014 | ||||||||||
Dates: |
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Volume: | Volume 438 | ||||||||||
Number: | Number 4 | ||||||||||
Page Range: | pp. 2839-2852 | ||||||||||
DOI: | 10.1093/mnras/stt2390 | ||||||||||
Status: | Peer Reviewed | ||||||||||
Publication Status: | Published | ||||||||||
Access rights to Published version: | Restricted or Subscription Access |
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