J/AJ/126/632 UBVRIz'HK' photometry of 2Ms CDFN X-ray sources (Barger+, 2003)
Optical and infrared properties of the 2Ms Chandra Deep Field North
X-ray sources.
Barger A.J., Cowie L.L., Capak P., Alexander D.M., Bauer F.E., Fernandez E.,
Brandt W.N., Garmire G.P., Hornschemeier A.E.
<Astron. J. 126, 632 (2003)>
=2003AJ....126..632B 2003AJ....126..632B
ADC_Keywords: X-ray sources ; Photometry, UBVRI ; Photometry, Cousins ;
Photometry, infrared ; Redshifts
Keywords: cosmology: observations - galaxies: active -
galaxies: distances and redshifts - galaxies: evolution -
galaxies: formation - X-rays
Abstract:
We present an optical and near-infrared catalog for the X-ray sources
in the 2Ms Chandra observation of the Hubble Deep Field North region.
We have high-quality multicolor imaging data for all 503 X-ray point
sources in the X-ray-selected catalog and reliable spectroscopic
redshifts for 284. We spectroscopically identify six high-redshift
(z>1) type II quasars (L2-8keV>1044ergs/s) in our sample. Our
spectroscopic completeness for the R≤24 sources is 87%. The
spectroscopic redshift distribution shows two broad redshift spikes
that have clearly grown over those originally seen in the 1Ms
exposure. The spectroscopically identified extragalactic sources
already comprise 75% of the measured 2-8keV light. Redshift slices
versus 2-8keV flux show that an impressive 54% of the measured 2-8keV
light arises from sources at z<1 and 68% from sources at z<2.
Description:
The X-ray sample is presented in Alexander et al., 2003,
Cat. J/AJ/126/539.
The optical imaging data consist of Johnson B, Johnson V, Cousins R,
Cousins I, and Sloan z' observations obtained with the Subaru
prime-focus camera Suprime-Cam on the Subaru 8.2m telescope during
February-April of 2001 and 2002.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1a.dat 121 503 Optical/NIR Properties of the 2Ms CDF-N X-Ray Sample
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See also:
B/chandra : The Chandra Archive Log (CXC, 2002)
J/AJ/126/539 : Chandra Deep Field North 2Ms catalog (Alexander+, 2003)
J/AJ/122/2810 : Chandra Deep Field North Survey. V. (Brandt+, 2001)
J/ApJ/554/742 : Chandra Deep Survey of the HDF-N (Hornschemeier+, 2001)
Byte-by-byte Description of file: table1a.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- [ABB2003] Alexander et al. (J/AJ/126/539) number,
[ABB2003] CDFN NNN in Simbad
5- 14 F10.6 deg RAdeg X-ray right ascension, decimal degrees (J2000)
16- 23 F8.5 deg DEdeg X-ray declination in decimal degrees (J2000)
25- 34 F10.6 deg oRAdeg Optical right ascension (J2000)
36- 43 F8.5 deg oDEdeg Optical declination (J2000)
45- 49 F5.2 10-18W/m2 SB ? The 0.5-2keV X-ray flux (1)
51- 56 F6.2 10-18W/m2 HB ? The 2-8keV X-ray flux (1)
58- 61 F4.1 mag RmagI ? Isophotal Cousins R magnitude
63 A1 --- f_HK'mag Sign of HK' magnitude (5)
64- 67 F4.1 mag HK'mag ? Corrected-aperture Wainscoat-Cowie HK'
magnitude (2.1um, 1992AJ....103..332W 1992AJ....103..332W) (5)
69 A1 --- f_z'mag Sign of z' magnitude (5)
70- 73 F4.1 mag z'mag ? Corrected-aperture Sloan z' magnitude (5)(2)
75 A1 --- f_Icmag Sign of Ic magnitude (5)
76- 79 F4.1 mag Icmag ? Corrected-aperture Cousins I magnitude (5)
81 A1 --- f_Rcmag Sign of Rc magnitude (5)
82- 85 F4.1 mag Rcmag ? Corrected-aperture Cousins R magnitude (5)
87 A1 --- f_Vmag Sign of V magnitude (5)
88- 91 F4.1 mag Vmag ? Corrected-aperture Johnson V magnitude (5)
93 A1 --- f_Bmag Sign of B magnitude (5)
94- 97 F4.1 mag Bmag ? Corrected-aperture Johnson B magnitude (5)
99 A1 --- f_Umag Sign of U magnitude (5)
100-103 F4.1 mag Umag ? Corrected-aperture U-band magnitude (5) (2)
105-109 F5.3 --- zspec ? Spectroscopic redshift
111 A1 --- f_zspec [os] Flag on zspec (3)
113-116 F4.2 --- zphot ? Photometric redshift
118-120 A3 --- Type Spectrum type (4)
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Note (1): From Alexander et al., 2003, (J/AJ/126/539),
in units of 10-15ergs/cm2/s.
Note (2): In the AB magnitude system. An AB magnitude is defined by
mAB=-2.5log(fν)-48.60, where fν is the flux of the
source in units of ergs/cm2/s/Hz.
Note (3): Note on spectroscopic redshift as follows:
o = Spectrum was obtained but no identification could be made;
s = Star.
Note (4): Spectrum type as follows:
B = Spectrum has broad emission lines
s = Less secure redshift identification based primarily on a single
emission line and the continuum shape
c = Redshift taken from Cohen et al., 2000, Cat. J/ApJ/538/29
m = Complex or multiple structure or possible contamination of the
photometry by a nearby brighter object
Note (5): Sources that had a negative flux in the aperture are listed with
a negative magnitude; in these cases, the absolute value of the
magnitude was computed from the absolute value of the flux.
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Nomenclature note:
[ABB2003] CDFN NNN = CXOHDFN JHHMMSS.s+DDMMSS
History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Patricia Bauer [CDS] 26-Sep-2003