J/MNRAS/371/221 Deep Chandra survey of the Groth Strip. II. (Georgakakis+, 2006)
A deep Chandra survey of the Groth Strip.
II. Optical identification of the X-ray sources.
Georgakakis A., Nandra K., Laird E.S., Gwyn S., Steidel C.C.,
Sarajedini V.L., Barmby P., Faber S.M., Coil A.L., Cooper M.C., Davis M.,
Newman J.A.
<Mon. Not. R. Astron. Soc., 371, 221-234 (2006)>
=2006MNRAS.371..221G 2006MNRAS.371..221G
ADC_Keywords: Surveys ; X-ray sources ; Redshifts
Keywords: surveys - galaxies: active - cosmology: observations -
X-rays: diffuse background - X-rays: galaxies
Abstract:
In this paper, we discuss the optical and X-ray spectral properties of
the sources detected in a single 200-ks Chandra pointing in the
Groth-Westphal Strip region. A wealth of optical photometric and
spectroscopic data are available in this field providing optical
identifications and redshift determinations for the X-ray population.
The optical photometry and spectroscopy used here are primarily from
the Deep Extragalactic Evolutionary Probe 2 (DEEP2) survey with
additional redshifts obtained from the literature. These are
complemented with the deeper (r≫26mag) multiwaveband data (ugriz)
from the Canada-France-Hawaii Telescope Legacy Survey to estimate
photometric redshifts and to optically identify sources fainter than
the DEEP2 magnitude limit (RAB≫24.5mag). We focus our study on the
2-10keV selected sample comprising 97 sources to the limit
8x10-16erg/s/cm2, this being the most complete in terms of optical
identification rate (86 per cent) and redshift determination fraction
(63 per cent; both spectroscopic and photometric).
Description:
The X-ray data used in this paper are from the A03 Chandra
observations of the original GWS, which is part of the EGS region. The
total exposure time is about 190ks split into three separate
integrations obtained at different epochs. All three observations were
obtained with the ACIS-I instrument.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 114 158 Chandra GWS X-ray/optical catalogue
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See also:
J/MNRAS/356/568 : Deep Chandra survey of the Groth Strip (Nandra+, 2005)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- [NLA2005] Sequential number (cNNN)
6- 7 I2 h RAh X-ray right ascension (J2000)
9- 10 I2 min RAm X-ray right ascension (J2000)
12- 16 F5.2 s RAs X-ray right ascension (J2000)
18 A1 --- DE- Declination sign (J2000)
19- 20 I2 deg DEd Declination (J2000)
22- 23 I2 arcmin DEm Declination (J2000)
25- 29 F5.2 arcsec DEs Declination (J2000)
31 A1 --- l_dOX Limit flag on dOX
32- 35 F4.2 arcsec dOX ?=- X-ray/optical centroid offset
37 A1 --- l_Prob Limit flag on Prob
38- 41 F4.2 % Prob ?=- Probability that the optical
counterpart is spurious alignment
43 A1 --- l_Rmag Limit flag in Rmag
44- 48 F5.2 mag Rmag R magnitude in AB system
50 I1 --- r_Opt ? Source of optical identification (1)
52- 56 F5.3 --- zspec ?=- Spectroscopic redshift
58 I1 --- r_zspec ? Source of zspec (2)
60- 63 A4 --- Class Optical spectroscopic classification (3)
65- 69 F5.3 --- zphot ?=- Photometric redshift
71- 74 F4.2 --- E_zphot ? Error on zphot (upper limit)
76- 79 F4.2 --- e_zphot ? Error on zphot (lower limit)
81 A1 --- l_NH Limit flag on NH
82- 87 F6.2 10+22cm-2 NH ?=- Hydrogen column density
89- 94 F6.2 10+22cm-2 E_NH ? Error on NH (upper limit)
96-101 F6.2 10+22cm-2 e_NH ? Error on NH (lower limit)
103-109 F7.3 10+36W LX ?=- Unobscured 0.5-10keV X-ray luminosity
111-114 A4 --- Det [fshu] Detection flags (4)
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Note (1): Source of optical identification as follows:
1 = DEEP2
2 = Steidel et al. (2003, Cat. J/ApJ/592/728)
3 = CFHTLS
Note (2): Source catalogue of spectroscopic redshift as follows:
1 = DEEP2
2 = DEEP (Weiner et al., 2005ApJ...620..595W 2005ApJ...620..595W)
3 = CFRS (Lilly et al. 1995, Cat. VII/225)
4 = Steidel et al. (2003, Cat. J/ApJ/592/728))
5 = SDSS, Cat. II/276
Note (3): Optical spectroscopic classification as follows:
NL = narrow emission lines
BL = broad emission lines
AB = absorption lines
UNCL = no classification available
STAR = Galactic star
Note (4): Source detected at <4x10-6 probability in the band:
f=full, s=soft, h=hard, u=ultrahard.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-May-2007