J/MNRAS/342/802 Chandra survey of 13-h XMM/ROSAT survey (McHardy+, 2003)
A medium-deep Chandra and Subaru survey of the 13-h XMM/ROSAT deep survey area.
McHardy I.M., Gunn K.F., Newsam A.M., Mason K.O., Page M.J., Takata T.,
Sekiguchi K., Sasseen T., Cordova F., Jones L.R., Loaring N.
<Mon. Not. R. Astron. Soc. 342, 802 (2003)>
=2003MNRAS.342..802M 2003MNRAS.342..802M
ADC_Keywords: Surveys - X-ray sources
Keywords: surveys - galaxies: clusters: general - quasars: general -
X-rays: diffuse background - X-rays: galaxies
Abstract:
We present the results of a Chandra ACIS-I survey of a high-latitude
region at 13h +38° which was earlier observed with ROSAT and
which has recently been observed by XMM-Newton for 200ks. XMM-Newton
will provide good-quality X-ray spectra for over 200 sources with
fluxes around the knee of the logN/logS, which are responsible for
the bulk of the X-ray background. The main aim of the Chandra
observations is to provide arcsecond, or better, positions, and hence
reliable identifications, for the XMM-Newton sources. The ACIS-I
observations were arranged in a mosaic of four 30-ks pointings,
covering almost all of the 15-arcmin radius XMM-Newton/ROSAT field. We
detect 214 Chandra sources above a Cash likelihood statistic of 25,
which approximates to 5σ significance, to a limiting flux of
∼1.3x10-15erg/cm2/s (0.5-7keV). Optical counterparts are derived
from a Subaru SuprimeCam image reaching to R∼27. The very large
majority of the Chandra sources have an optical counterpart, with the
distribution peaking at 23<R<24, although 14 have no counterpart to
R=27. The fraction of X-ray sources with no identification brighter
than R=27 is similar to that found in deeper Chandra surveys.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 95 214 Flux-ordered catalogue of Chandra sources and
their optical counterparts.
table5.dat 100 77 Catalogue of ROSAT sources detected by Chandra
tablea1.dat 86 21 Chandra sources with alternative optical
counterparts
notes.dat 80 47 Notes on sources with more than one possible
counterpart (listed in tablea1.dat)
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See also:
IX/37 : XMM-Newton Serendipitous Source Catalogue (1XMM) (XMM-SSC, 2003)
IX/10 : ROSAT All-Sky Bright Source Catalogue (1RXS) (Voges+ 1999)
IX/29 : ROSAT All-Sky Survey Faint Source Catalog (Voges+ 2000)
IX/30 : Second ROSAT PSPC Catalog (ROSAT, 2000)
B/chandra : The Chandra Archive Log (CXC, 2002)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [MGN2003] Sequential number of Chandra source
4 A1 --- n_[MGN2003] [*+o] Notes (1)
6 A1 --- Alt [UP] Flag for alternative optical
candidate (G1)
8- 13 F6.2 aW/m2 Flux 0.5-7.0keV flux
15- 21 F7.1 --- chi2 Cash ξ2 value for the Chandra source
23- 24 I2 h RAh Chandra right ascension (J2000)
26- 27 I2 min RAm Chandra right ascension (J2000)
29- 33 F5.2 s RAs Chandra right ascension (J2000)
35 A1 --- DE- Chandra declination sign (J2000)
36- 37 I2 deg DEd Chandra declination (J2000)
39- 40 I2 arcmin DEm Chandra declination (J2000)
42- 46 F5.2 arcsec DEs Chandra declination (J2000)
48- 52 F5.2 arcsec DRA(O-X) ? Optical-Chandra offset in right ascension
54- 58 F5.2 arcsec DDE(O-X) ? Optical-Chandra offset in declination
60- 63 F4.2 arcsec D(O-X) ? Total optical-Chandra offset
65- 66 A2 --- l_Rmag [≤ >] Limit flag on Rmag
67- 70 F4.1 mag Rmag R magnitude of the optical counterpart
72- 76 F5.2 arcmin OffC Chandra off-axis angle of the source
78- 82 F5.2 arcmin OffX XMM off-axis angle of the source
84- 87 F4.2 arcsec FWHM ? Fulll Width at Half Maximum
89- 92 F4.2 --- S/G [0/1]? Stellarity of the optical counterpart
0 for galaxy, 1 for star
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Note (1): Individial notes as follows:
o = Optical counterpart is not deblended properly by SExtractor
software so the coordinates and magnitude, but not stellarity or
FWHM, are calculated manually.
* = Optical position is taken direct from the APM scan of the POSSII
plates and magnitude is from UH imaging.
+ = Magnitude taken from CFHT image. For source 114 we give the
coordinates of a very faint object which is not visible on the
CFHT image but which is visible on a deep B-band image (Croom,
private communication). Sources 99 and 114, the identifications
of which are unreliable because of the lower-sensitivity
imaging, are not included in any statistical analysis.
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ROS ROSAT sequential number
5- 6 I2 h RARh ROSAT right ascension (J2000)
8- 9 I2 min RARm ROSAT right ascension (J2000)
11- 15 F5.2 s RARs ROSAT right ascension (J2000)
17 A1 --- DER- ROSAT declination sign (J2000)
18- 19 I2 deg DERd ROSAT declination (J2000)
21- 22 I2 arcmin DERm ROSAT declination (J2000)
24- 28 F5.2 arcsec DERs ROSAT declination (J2000)
29- 31 I3 --- [MGN2003] Sequential number of Chandra source
33- 34 I2 h RAh Chandra right ascension (J2000)
36- 37 I2 min RAm Chandra right ascension (J2000)
39- 43 F5.2 s RAs Chandra right ascension (J2000)
45 A1 --- DE- Chandra declination sign (J2000)
46- 47 I2 deg DEd Chandra declination (J2000)
49- 50 I2 arcmin DEm Chandra declination (J2000)
52- 56 F5.2 arcsec DEs Chandra declination (J2000)
57- 60 F4.1 arcsec D(R-C) Total ROSAT-Chandra offset
62- 65 F4.1 arcsec D(O-C) ? Total Optical-Chandra offset
67- 70 F4.1 arcmin OffC Chandra off-axis angle of the source
72- 75 F4.1 arcmin OffX XMM/ROSAT off-axis angle of the source
77- 82 A6 --- Class Classification (1)
84- 87 F4.2 --- z ? Redshift
89- 91 A3 --- Rflag Confidence parameter from McHardy et al,
1998MNRAS.295..641M 1998MNRAS.295..641M
94 A1 --- Conf [YN?] Confirmed source (2)
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Note (1): Classification as follows:
BLANK = no classification
CLU = cluster
G/NELG = Galaxy/narrow-emission-line galaxies
G/QSO? = Galaxy/quasar ?
GAL? = Galaxy ?
GP/GAL = Galaxy pair/galaxy
GRP = Group of galaxies
GSTAR = G star
KSTAR? = K star ?
MSTAR = M star
NELG = narrow-emission-line galaxies
QSO = quasar
Note (2): Confirmed sources flag as follows:
Y = optical counterpart is <1" from the Chandra source when OffC<6'
(extended to <1.6" for 6<OffC<8')
N = optical counterpart is >3" the Chandra source
? = all intermediate cases
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [MGN2003] Sequential number of Chandra source
5 A1 --- Alt [UP] Note on identification (G1)
7- 10 F4.2 10-18W/m2 Flux 0.5-7.0keV flux
12- 16 F5.1 --- chi2 Cash ξ2 value for the Chandra source
18- 19 I2 h RAh Chandra right ascension (J2000)
21- 22 I2 min RAm Chandra right ascension (J2000)
24- 28 F5.2 s RAs Chandra right ascension (J2000)
30 A1 --- DE- Chandra declination sign (J2000)
31- 32 I2 deg DEd Chandra declination (J2000)
34- 35 I2 arcmin DEm Chandra declination (J2000)
37- 41 F5.2 arcsec DEs Chandra declination (J2000)
43- 47 F5.2 arcsec DRA(O-X) ? Optical-Chandra offset in right ascension
49- 53 F5.2 arcsec DDE(O-X) ? Optical-Chandra offset in declination
55- 58 F4.2 arcsec D(O-X) ? Total optical-Chandra offset
60- 63 F4.1 mag Rmag R magnitude of the optical counterpart
65- 69 F5.2 arcmin OffC Chandra off-axis angle of the source
71- 75 F5.2 arcmin OffX XMM off-axis angle of the source
77- 81 F5.2 arcsec FWHM ? Fulll Width at Half Maximum
83- 86 F4.2 --- S/G [0/1]? Stellarity of the optical counterpart
0 for galaxy, 1 for star
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [MGN2003] Sequential number of Chandra source
5 A1 --- Alt [UP] Note on identification (G1)
7- 80 A74 --- Note Text of the note
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Global notes:
Note (G1): Note on identification as follows:
U = the true identification is uncertain.
P = the primary identification is probably correct but SExtractor
did pick up another, less likely, candidate within 2 arcsec of
the Chandra centroid. The primary candidate is chosen, unless
stated otherwise, on the basis of being closer to the Chandra
centroid and being brighter.
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History:
From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 12-Sep-2003