Access to Astronomical Catalogues

← Click to display the menu
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
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:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1a.dat 121 503 Optical/NIR Properties of the 2Ms CDF-N X-Ray Sample
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
Bytes Format Units Label Explanations
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) (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)
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.
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
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

catalogue service

© UDS/CNRS

Contact