CLANSOID - Chandra Lockman Area North Survey (CLANS) Optical & IR Catalog

Overview

This table contains the redshift catalog for the X-ray sources detected in the Chandra Lockman Area North Survey (CLANS). The redshifts for the CLANS field are all new. For fluxes above 10^-14 ergs cm^-2 s^-1 (2-8 keV) the authors have redshifts for 76% of the sources in the CLANS, CLASXS, and CDF-N surveys. They extend the redshift information for the full sample using photometric redshifts. The goal of the OPTX Project is to use these three surveys, 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 optical and infrared photometric catalog for the CLANS X-ray sources is presented here (see the CLANS Browse table for the X-ray information). The CLANS and CLASXS surveys bridge the gap between the ultra-deep pencil-beam surveys, such as the CDFs, and the shallower, very large-area surveys. As a result, they probe the X-ray sources that contribute the bulk of the 2-8 keV X-ray background and cover the flux range of the observed break in the log N - log S distribution.

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 December 2008 based on the electronic version of Table 11 from the paper which was obtained from the ApJ web site.

HEASARC Implementation

Of the 761 CLANS X-ray sources, 120 sources were given null positions in Table 11 of the reference paper on which this HEASARC table is based. We have not included these sources in this HEASARC table, which consequently has only 761 - 120 = 641 entries. We do list these 120 null-position sources in the file http://heasarc.gsfc.nasa.gov/FTP/heasarc/dbase/misc_files/clansoid/nulls.dat which is in exactly the same format as Table 11 of the reference paper.

Parameters

Source_Number
The CLANS source identification number, a unique identifier in ascending order of J2000 Right Ascension.

Name
The CLANS source designation, based on the 'CLANS' prefix and the source number, as recommended by the CDS Dictionary of Nomenclature of Celestial Objects.

RA
The Right Ascension of the optical/near-infrared counterpart of the X-ray source in the selected equinox. This was given in decimal degree J2000.0 coordinates to a precision of 10-3 degrees (3.6 arcsec) in the reference paper.

Dec
The Declination of the optical/near-infrared counterpart of the X-ray source in the selected equinox. This was given in decimal degree J2000.0 coordinates to a precision of 10-3 degrees (3.6 arcsec) in the reference paper.

LII
The Galactic Longitude of the optical/near-infrared counterpart of the X-ray source.

BII
The Galactic Latitude of the optical/near-infrared counterpart of the X-ray source.

Gmag
The aperture-corrected, broad-band g-prime (AB) magnitude of the optical/near-infrared counterpart of the X-ray source. Typical photometric uncertainties are given in Section 3.6 of the reference paper. A null value for the magnitude implies that the counterpart was not detected above a 2-sigma significance level.

Rmag
The aperture-corrected, broad-band r-prime (AB) magnitude of the optical/near-infrared counterpart of the X-ray source. Typical photometric uncertainties are given in Section 3.6 of the reference paper. A null value for the magnitude implies that the counterpart was not detected above a 2-sigma significance level.

Imag
The aperture-corrected, broad-band i-prime (AB) magnitude of the optical/near-infrared counterpart of the X-ray source. Typical photometric uncertainties are given in Section 3.6 of the reference paper. A null value for the magnitude implies that the counterpart was not detected above a 2-sigma significance level.

Zmag
The aperture-corrected, broad-band z-prime (AB) magnitude of the optical/near-infrared counterpart of the X-ray source. Typical photometric uncertainties are given in Section 3.6 of the reference paper. A null value for the magnitude implies that the counterpart was not detected above a 2-sigma significance level.

Jmag
The aperture-corrected, broad-band J (AB) magnitude of the optical/near-infrared counterpart of the X-ray source. Typical photometric uncertainties are given in Section 3.6 of the reference paper. A null value for the magnitude implies that the counterpart was not detected above a 2-sigma significance level.

Hmag
The aperture-corrected, broad-band H (AB) magnitude of the optical/near-infrared counterpart of the X-ray source. Typical photometric uncertainties are given in Section 3.6 of the reference paper. A null value for the magnitude implies that the counterpart was not detected above a 2-sigma significance level.

Kmag
The aperture-corrected, broad-band K (AB) magnitude of the optical/near-infrared counterpart of the X-ray source. Typical photometric uncertainties are given in Section 3.6 of the reference paper. A null value for the magnitude implies that the counterpart was not detected above a 2-sigma significance level.

IRAC_3p6_um_Mag
The Spitzer IRAC 3.6-micron (µm) band AB magnitude of the optical/near-infrared counterpart of the X-ray source. A null value for the magnitude implies that the counterpart was not detected above a 2-sigma significance level.

MIPS_24_um_Mag
The Spitzer MIPS 24-micron (µm) band AB magnitude of the optical/near-infrared counterpart of the X-ray source. A null value for the magnitude implies that the counterpart was not detected above a 2-sigma significance level.

Redshift
The spectroscopic redshift z_spec of the optical/near-infrared counterpart of the X-ray source. z_spec = 0 and a corresponding broad_type value of -99 implies that the source was spectroscopically observed but neither the redshift nor the class could be identified. z_spec = -1 and the corresponding broad_type value = -1 implies that the source had not yet been spectroscopically observed. z_spec = -2 and the corresponding broad_type value = -2 implies that the source is a star.

Phot_Redshift
The photometric redshift z_phot of the optical/near-infrared counterpart of the X-ray source determined using the authors' template-fitting technique. z_phot = -3 means that the source has a spectroscopic redshift. z_phot = -99 means that the source has neither a spectroscopic nor a photometric redshift.

Broad_Type
The optical spectral classification of the optical/near-infrared counterpart of the X-ray source. A class value of 0 implies an absorber, a class of 1, a star former, a class of 3, a high-excitation source, and a class of 4, a broad-line AGN.

Contact Person

Questions regarding the CLANSOID database table can be addressed to the HEASARC Help Desk.

Page Author: Browse Software Development Team
Last Modified: Monday, 16-Sep-2024 17:26:01 EDT