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CDFN2MSOI2 - Chandra Deep Field North Updated Optical & IR Catalog

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Overview

This table contains the redshift catalog for the X-ray sources detected in the Chandra Deep Field-North (CDF-N). The catalog for the CDF-N includes redshifts from previous work. The authors have extended the redshift information for the full sample using photometric redshifts. The goal of the OPTX Project is to use this survey, together with the Chandra Large-Area Synoptic X-Ray Survey (CLASXS) and the Chandra Lockman Area North Survey (CLANS), which are among the most spectroscopically complete surveys to date, to analyze the effect of spectral type on the shape and evolution of the X-ray luminosity functions and to compare the optical spectral types with the X-ray spectral properties. The CLANS and CLASXS surveys bridge the gap between the ultradeep pencil-beam surveys, such as the Chandra Deep Fields, and the shallower, very large-area surveys.

This table also contains updated optical and infrared photometric data for the X-ray sources in the CDF-N. Typical photometric uncertainties are given in Section 3.6 of the reference paper (Trouille et al. 2008).

The X-ray information for the sources detected in the CDF-N 2-megasecond exposure which was published in Alexander et al. (2003, AJ, 126, 539) is available as the HEASARC CHANDFN2MS table, while the earlier catalog which listed information about optical and infrared counterparts (Barger et al. 2003, AJ, 126, 632) is available as the HEASARC CDFN2MSOID table.


Catalog Bibcode

2008ApJS..179....1T

References

The OPTX Project. I. The Flux and Redshift Catalogs for the CLANS, CLASXS, and
CDF-N Fields.
   Trouille L., Barger A.J., Cowie L.L., Yang Y., Mushotzky R.F.
  <Astrophys. J. Suppl., 179, 1-18 (2008)>
  =2008ApJS..179....1T

Provenance

This table was created by the HEASARC in January 2009 based on the electronic version of Table 13 from the paper which was obtained from the ApJ web site.

Parameters

Source_Number
The CDF-N source number, a unique identifier in order of increasing J2000.0 Right Ascension, taken from Alexander et al. (2003, AJ, 126, 539).

Name
The CDF-N source designation, based on the X-ray source identification number, using the prefix recommended by the Dictionary of Nomenclature of Celestial Objects.

RA
The Right Ascension of the optical/NIR counterpart to the CDF-N X-ray source in the selected equinox. This was given in J2000.0 decimal degrees to an accuracy of 0.001 degrees (3.6 arcsec) in the original table.

Dec
The Declination of the optical/NIR counterpart to the CDF-N X-ray source in the selected equinox. This was given in J2000.0 decimal degrees to an accuracy of 0.001 degrees (3.6 arcsec) in the original table.

LII
The Galactic Longitude of the optical/NIR counterpart to the CDF-N X-ray source.

BII
The Galactic Latitude of the optical/NIR counterpart to the CDF-N X-ray source.

Umag
The U-band AB magnitude of the optical/NIR counterpart to the CDF-N X-ray source taken from Barger et al. (2003, AJ, 126, 632). A null value for the magnitude means that the source was not detected in this band (2-sigma significance). A negative value for the magnitude means that, at the location of the source in this band, the flux measured was negative. The authors converted the absolute value of this flux to a magnitude and then placed a negative sign in front to signal the negative flux measurement. This was done by the authors so that these values could be used for statistical purposes.

Bmag
The B-band AB magnitude of the optical/NIR counterpart to the CDF-N X-ray source taken from Barger et al. (2003, AJ, 126, 632). A null value for the magnitude means that the source was not detected in this band (2-sigma significance). A negative value for the magnitude means that, at the location of the source in this band, the flux measured was negative. The authors converted the absolute value of this flux to a magnitude and then placed a negative sign in front to signal the negative flux measurement. This was done by the authors so that these values could be used for statistical purposes.

Vmag
The V-band AB magnitude of the optical/NIR counterpart to the CDF-N X-ray source taken from Barger et al. (2003, AJ, 126, 632). A null value for the magnitude means that the source was not detected in this band (2-sigma significance). A negative value for the magnitude means that, at the location of the source in this band, the flux measured was negative. The authors converted the absolute value of this flux to a magnitude and then placed a negative sign in front to signal the negative flux measurement. This was done by the authors so that these values could be used for statistical purposes.

Rmag
The R-band AB magnitude of the optical/NIR counterpart to the CDF-N X-ray source taken from Barger et al. (2003, AJ, 126, 632). A null value for the magnitude means that the source was not detected in this band (2-sigma significance). A negative value for the magnitude means that, at the location of the source in this band, the flux measured was negative. The authors converted the absolute value of this flux to a magnitude and then placed a negative sign in front to signal the negative flux measurement. This was done by the authors so that these values could be used for statistical purposes.

Imag
The I-band AB magnitude of the optical/NIR counterpart to the CDF-N X-ray source taken from Barger et al. (2003, AJ, 126, 632). A null value for the magnitude means that the source was not detected in this band (2-sigma significance). A negative value for the magnitude means that, at the location of the source in this band, the flux measured was negative. The authors converted the absolute value of this flux to a magnitude and then placed a negative sign in front to signal the negative flux measurement. This was done by the authors so that these values could be used for statistical purposes.

Zmag
The z-prime (z') band AB magnitude of the optical/NIR counterpart to the CDF-N X-ray source taken from Barger et al. (2003, AJ, 126, 632). A null value for the magnitude means that the source was not detected in this band (2-sigma significance). A negative value for the magnitude means that at the location of the source in this band, the flux measured was negative. The authors converted the absolute value of this flux to a magnitude and then placed a negative sign in front to signal the negative flux measurement. This was done by the authors so that these values could be used for statistical purposes.

Jmag
The new J-band AB magnitude of the optical/NIR counterpart to the CDF-N X-ray source. A null value for the magnitude means that the source was not detected in this band (2-sigma significance).

Hmag
The new H-band AB magnitude of the optical/NIR counterpart to the CDF-N X-ray source. A null value for the magnitude means that the source was not detected in this band (2-sigma significance).

Kmag
The new K_s band AB magnitude of the optical/NIR counterpart to the CDF-N X-ray source. A null value for the magnitude means that the source was not detected in this band (2-sigma significance).

IRAC_3p6_um_Mag
The Spitzer IRAC 3.6-um band AB magnitude of the IR counterpart to the CDF-N X-ray source. A null value for the magnitude means that the source was not detected in this band (2-sigma significance). A negative value for the magnitude means that at the location of the source in this band, the flux measured was negative. The authors converted the absolute value of this flux to a magnitude and then placed a negative sign in front to signal the negative flux measurement. This was done by the authors so that these values could be used for statistical purposes.

MIPS_24_um_Mag
The Spitzer MIPS 24-um band AB magnitude of the IR counterpart to the CDF-N X-ray source. A null value for the magnitude means that the source was not detected in this band (2-sigma significance).

Redshift
The updated spectroscopic redshift z_spec of the optical/IR counterpart to the CDF-N X-ray source. A value of z_spec > 0 and a corresponding value of broad_type = 10 indicates that the spectroscopic redshift is from the literature without a corresponding spectrum. A value of zspec = 0 and a corresponding value of broad_type = -99 indicates that the source was spectroscopically observed but that neither the redshift nor the class could be identified. A value of zspec = -1 and a corresponding broad_type = -1 indicates that the source was not yet spectroscopically observed. A value of zspec = -2 and a corresponding broad_type = -2 indicates that the source is a star.

Ref_Redshift
This flag parameter is set to the following values in order to indicate their sources:

      a = Barger et al. (2003, AJ, 126, 632)
      b = Swinbank et al. (2004, ApJ, 617, 64)
      c = Chapman et al. (2005, ApJ, 622, 772)
      d = Reddy et al. (2006, ApJ, 653, 1004)
  
All other spectroscopic redshifts were presented in the reference paper for this table, Trouille et al. (2008), for the first time.

Phot_Redshift
The photometric redshift z_phot of the optical/IR counterpart to the CDF-N X-ray source obtained using the authors' template-fitting technique. A value of -3 means that the source has a spectroscopic redshift, while a value of -99 that the source has neither a spectroscopic nor a photometric redshift.

Broad_Type
A code for the authors' optical spectral classification of the counterpart to the CDF-N X-ray source. The astrophysical values of this parameter are 0 for absorbers, 1 for star formers, 3 for high-excitation sources, and 4 for broad-line AGNs. The meaning of the value of 10 and the negative values of this parameter is explained above (see the redshift parameter description).


Contact Person

Questions regarding the CDFN2MSOI2 database table can be addressed to the HEASARC User Hotline.

Page Author: Browse Software Development Team
Last Modified: 28-Jan-2009