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CDFN2MSOID - Chandra Deep Field North 2-Megasecond Optical & IR Catalog

HEASARC
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Overview

The Chandra Deep Field North (CDFN) 2-Megasecond (2Ms) Optical and IR Catalog is an optical and near-infrared catalog for the X-ray sources in the 2Ms Chandra observation of the Hubble Deep Field North region. It has high-quality multicolor imaging data for all 503 X-ray point sources in the X-ray-selected catalog and reliable spectroscopic redshifts for 284. The authors have spectroscopically identified six high-redshift (z > 1) type II quasars (L_2-8keV > 10^44 ergs/s) in their sample. The 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 2-8 keV light. Redshift slices versus 2-8 keV flux show that an impressive 54% of the measured 2-8 keV light arises from sources at z < 1 and 68% from sources at z < 2.

The X-ray sample is presented in Alexander et al. (2003, AJ, 126, 539, hereafter ABB2003) and in CDS Catalog <J/AJ/126/539>, and is also available in the HEASARC Browse system as the CHANDFN2MS table. 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.


Catalog Bibcode

2003AJ....126..632B

References

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
The Chandra Deep Field North Survey. XIII. 2 Ms point-source catalogs.
    Alexander D.M., Bauer F.E., Brandt W.N., Schneider D.P., Hornschemeier A.E.,
    Vignali C., Barger A.J., Broos P.S., Cowie L.L., Garmire G.P.,
    Townsley L.K., Bautz M.W., Chartas G., Sargent W.L.W.
   <Astron. J. 126, 539 (2003)>
   =2003AJ....126..539A

Provenance

This table was created by the HEASARC in April 2004 based on CDS Catalog J/AJ/126/632/table1a.dat.

Parameters

Sequence_Number
The X-ray source sequence number taken from ABB2003 in order of increasing right ascension.

Name
The object designation using the prefix recommended by the Dictionary of Nomenclature of Celestial Objects and implemented in the CDS Simbad service. The authors describe an alternative form for these sources using the Chandra X-Ray Observatory (CXO) naming convention: the prefix "CXO HDFN J" together with the J2000 RA and declination, truncated to 0.1 seconds of time and 1 arcsecond, respectively. Thus, the object with sequence_number of 1 and the J2000 position of 12 35 15.04, +62 14 07.0 has the name of "[ABB2003] CDFN 1" here, and the alternate name of "CXO HDFN J123515.0+621407".

RA_Xray
The Right Ascension of the X-Ray source in fixed J2000 coordinates taken from ABB2003.

Dec_Xray
The Declination of the X-Ray source in fixed J2000 coordinates taken from ABB2003.

RA
The Right Ascension of the optical object at the position where the aperture magnitudes were measured, in the selected equinox. This was given in decimal degrees in the J2000 equinox in the original table, and with a precision of 1E-06 degrees.

Dec
The Declination of the optical object at the position where the aperture magnitudes were measured, in the selected equinox. This was given in decimal degrees in the J2000 equinox in the original table, and with a precision of 1E-05 degrees.

LII
The Galactic Longitude of the optical source.

BII
The Galactic Latitude of the optical source.

SB_Flux
The soft-band (0.5-2 keV) X-Ray flux, in erg/s/cm^2, taken from ABB2003.

HB_Flux
The hard-band (2-8 keV) X-Ray flux, in erg/s/cm^2, taken from ABB2003.

Rmag_Iso
The isophotal Cousins R Magnitude of the object.

HKmag
The corrected-aperture Wainscoat-Cowie HKprime (HK') magnitude of the object.

Zmag
The corrected-aperture Sloan z-prime (z') magnitude of the object.

Imag
The corrected-aperture Cousins I magnitude of the object.

Rmag
The corrected-aperture Cousins R magnitude of the object.

Vmag
The corrected-aperture Johnson V magnitude of the object.

Bmag
The corrected-aperture Johnson B magnitude of the object.

Umag
The corrected-aperture U-band magnitude of the objecty on the AB-magnitude system, defined by m_AB = -2.5log(f_{nu}) - 48.60, where f_{nu} is the flux of the source in units of ergs/cm^2/s/Hz.

Spect_Redshift
The spectroscopic redshift of the object, if available.

Flag_Spect_Redshift
A flag for the spectroscopic redshift, as follows:

      o = Spectrum was obtained but no identification could be made;
      s = Star.
  

Phot_Redshift
The photometric redshift of the object, if available.

Spectrum_Type
A flag for the type of spectrum observed, 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
  

Contact Person

Questions regarding the CDFN2MSOID database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 8-Nov-2004