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The Chandra Galactic Bulge Survey: optical catalogue and point-source counterparts to X-ray sources | | T. Wevers
; S. T. Hodgkin
; P. G. Jonker
; C. Bassa
; G. Nelemans
; T. van Grunsven
; E. A. Gonzalez-Solares
; M. A. P. Torres
; C. Heinke
; D. Steeghs
; T. J. Maccarone
; C. Britt
; R. I. Hynes
; C. Johnson
; Jianfeng Wu
; | | Date: |
9 May 2016 | | Abstract: | As part of the Chandra Galactic Bulge Survey (GBS), we present a catalogue of
optical sources in the GBS footprint. This consists of two regions centered at
Galactic latitude b = 1.5 degrees above and below the Galactic Centre, spanning
(l x b) = (6x1) degrees. The catalogue consists of 2 or more epochs of
observations for each line of sight in r’, i’ and H{alpha} filters. It is
complete down to r’ = 20.2 and i’ = 19.2 mag; the mean 5{sigma} depth is r’ =
22.5 and i’ = 21.1 mag. The mean root-mean-square residuals of the astrometric
solutions is 0.04 arcsec. We cross-correlate this optical catalogue with the
1640 unique X-ray sources detected in Chandra observations of the GBS area, and
find candidate optical counterparts to 1480 X-ray sources. We use a false alarm
probability analysis to estimate the contamination by interlopers, and expect ~
10 per cent of optical counterparts to be chance alignments. To determine the
most likely counterpart for each X-ray source, we compute the likelihood ratio
for all optical sources within the 4{sigma} X-ray error circle. This analysis
yields 1480 potential counterparts (~ 90 per cent of the sample). 584
counterparts have saturated photometry (r’<17, i’<16), indicating these objects
are likely foreground sources and the real counterparts. 171 candidate
counterparts are detected only in the i’-band. These sources are good qLMXB and
CV candidates as they are X-ray bright and likely located in the Bulge. | | Source: | arXiv, 1605.2741 | | Services: | Forum | Review | PDF | Favorites | |
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