J/ApJ/703/30 NIR counterparts to Chandra X-ray sources. I. (Mauerhan+, 2009)
Near-infrared counterparts to Chandra X-ray sources toward the Galactic center.
I. Statistics and a catalog of candidates.
Mauerhan J.C., Muno M.P., Morris M.R., Bauer F.E., Nishiyama S., Nagata T.
<Astrophys. J., 703, 30-41 (2009)>
=2009ApJ...703...30M 2009ApJ...703...30M (SIMBAD/NED BibCode)
ADC_Keywords: X-ray sources ; Photometry, infrared ; Surveys
Keywords: catalogs - Galaxy: center - infrared: stars - surveys -
X-rays: binaries - X-rays: stars
Abstract:
We present a catalog of 5184 candidate infrared counterparts to X-ray
sources detected toward the Galactic center. The X-ray sample contains
9017 point sources detected in this region by the Chandra X-ray
Observatory during the past decade, including data from a recent deep
survey of the central 2°x0.8° of the Galactic plane. A total
of 6760 of these sources have hard X-ray colors, and the majority of
them lie near the Galactic center, while most of the remaining 2257
soft X-ray sources lie in the foreground. We cross-correlated the
X-ray source positions with the 2MASS and SIRIUS near-infrared
catalogs, which collectively contain stars with a 10σ limiting
flux of Ks≤15.6mag. For each of the infrared matches to X-ray sources
in our catalog we derived the probability that the association is
real, based on the source properties and the results of the
cross-correlation analysis.
Description:
For the X-ray sample, we used the Chandra catalog of 9017 X-ray point
sources detected in a 2°x0.8° field around the Galactic center
in lxb, respectively (Muno et al. 2009, Cat. J/ApJS/181/110). This
catalog incorporates all Chandra ACIS-I observations of this region
performed through the end of 2007 July. The main near-infrared catalog
used for this work was produced by the Simultaneous-3-color InfraRed
Imager for Unbiased Surveys (SIRIUS; Nagashima et al.
1999sf99.proc..397N; Nagayama et al. 2003SPIE.4841..459N 2003SPIE.4841..459N) on the 1.4m
Infrared Survey Facility (IRSF) in South Africa.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 109 5184 Candidate infrared counterparts to X-ray sources
toward the Galactic Center
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See also:
B/chandra : The Chandra Archive Log (CXC, 1999-)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
J/ApJS/181/110 : Galactic center X-ray sources (Muno+, 2009)
J/ApJ/685/958 : Spitzer and Chandra sources in galactic center (Arendt+ 2008)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- ID Source number (<[MMM2009] NNNN> in Simbad)
6- 9 I4 --- Seq [1/9017] Muno et al. 2009 (Cat. J/ApJS/181/110)
X-ray source record number
11- 25 A15 --- CXOGC IAU name of X-ray source;
(HHMMSS.s+DDMMSS; J2000) (1)
27- 29 F3.1 arcsec ePos Positional uncertainty of X-ray source (95%)
31- 34 A4 --- Xcl Hardness class of X-ray source: hard or soft
36- 39 A4 --- IRcl Color class of of IR match: red or blue
41- 49 F9.5 deg RAdeg IR match Right Ascension (J2000)
51- 59 F9.5 deg DEdeg IR match Declination (J2000)
61- 64 F4.2 arcsec phi Angular separation of X-ray source and IR match
66- 71 F6.4 arcsec-2 rho Background surface density of IR sources (2)
73- 76 F4.1 % Prob ?=-1 Percent probability for IR match (3)
78- 82 F5.2 mag Jmag ?=0 J band magnitude
84- 87 F4.2 mag e_Jmag ?=0 Uncertainty in Jmag
89- 93 F5.2 mag Hmag ?=0 H band magnitude
95- 98 F4.2 mag e_Hmag ?=0 Uncertainty in Hmag
100-104 F5.2 mag Ksmag Ks band magnitude
106-109 F4.2 mag e_Ksmag Uncertainty in Ksmag
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Note (1): Although approximately correct, these are not necessarily equivalent
to the actual X-ray positions, which are given in Muno et al.
2009, Cat. J/ApJS/181/110
Note (2): With Ks≤Ks match.
Note (3): Calculated using equations 2 and 3. Probabilities for red matches to
soft X-ray source were not computed (see text), and are assigned
values of -1.0.
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History:
From electronic version of the journal
References:
Mauerhan et al. Paper II. 2010ApJ...710..706M 2010ApJ...710..706M
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 10-Oct-2011