J/MNRAS/438/2839 Galactic Bulge Survey X-ray sources NIR ctp (Greiss+, 2014)
Near-infrared counterparts to the Galactic Bulge Survey X-ray source population.
Greiss S., Steeghs D., Jonker P.G., Torres M.A.P., Maccarone T.J.,
Hynes R.I., Britt C.T., Nelemans G., Gansicke B.T.
<Mon. Not. R. Astron. Soc., 438, 2839-2852 (2014)>
=2014MNRAS.438.2839G 2014MNRAS.438.2839G (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Milky Way ; X-ray sources ; Infrared sources ;
Photometry, infrared
Keywords: surveys - infrared: stars - X-rays: binaries - X-rays: stars
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.
Description:
The GBS combines sensitivity for faint X-ray sources, the astrometric
accuracy of the Chandra X-ray Observatory, with a complementary
photometric optical r', i' and Hα survey (Jonker et al., 2011,
Cat J/ApJS/194/18).
We exploit NIR data of the bulge region in order to find the
counterparts of the GBS X-ray sources. Here, we present three NIR
surveys which nominally cover the GBS fields: 2MASS, UKIDSS GPS and
VVV. All three surveys have a different depth and coverage, each
offering specific advantages in the search for the NIR counterparts of
the GBS sources.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 149 4661 Table containing all NIR data and FAP of
matches within R95
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See also:
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
II/316 : UKIDSS-DR6 Galactic Plane Survey (Lucas+ 2012)
II/348 : VISTA Variable in the Via Lactea Survey DR2 (Minniti+, 2017)
J/ApJS/194/18 : The Galactic Bulge Survey: X-ray observations (Jonker+, 2011)
Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- GBS GBS source name (CXNNNN, CXBNNNN)
9- 10 I2 h RAh GBS right ascension (J2000)
12- 13 I2 min RAm GBS right ascension (J2000)
15- 19 F5.2 s RAs GBS right ascension (J2000)
21 A1 --- DE- GBS declination sign (J2000)
22- 23 I2 deg DEd GBS declination (J2000)
25- 26 I2 arcmin DEm GBS declination (J2000)
28- 31 F4.1 arcsec DEs GBS declination (J2000)
33- 34 I2 h RAIh ? NIR right ascension (J2000)
36- 37 I2 min RAIm ? NIR right ascension (J2000)
39- 43 F5.2 s RAIs ? NIR right ascension (J2000)
45 A1 --- DEI- NIR declination sign (J2000)
46- 47 I2 deg DEId ? NIR declination (J2000)
49- 50 I2 arcmin DEIm ? NIR declination (J2000)
52- 55 F4.1 arcsec DEIs ? NIR declination (J2000)
57- 64 F8.6 arcsec Offset ? Distance between GBS and NIR sources
66- 71 F6.3 mag Jmag ? J magnitude from NIR survey
73- 77 F5.3 mag e_Jmag ? rms uncertainty on J magnitude
79- 84 F6.3 mag Hmag ? H magnitude from NIR survey
86- 91 F6.3 mag e_Hmag ? rms uncertainty on H magnitude
93- 98 F6.3 mag Kmag ? K magnitude from NIR survey
100-105 F6.3 mag e_Kmag ? rms uncertainty on K magnitude
107-112 A6 --- Survey NIR survey (2MASS, UKIDSS or VVV)
114-122 E9.4 --- FAPfinal ?=- False alarm probability
124-149 A26 --- Comments Comments (1)
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Note (1): References are :
(a) = Maccarone et al. (2012MNRAS.426.3057M 2012MNRAS.426.3057M)
(b) = Hynes et al. (2012, Cat. J/ApJ/761/162)
(c) = Britt et al. (2013ApJ...769..120B 2013ApJ...769..120B)
(d) = Ratti et al. (2013MNRAS.428.3543R 2013MNRAS.428.3543R)
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 23-Oct-2018