CDFSAGNCXO ivo://nasa.heasarc/cdfsagncxo NASA/GSFC HEASARC Tozzi et al. 2026-10-09 NASA/GSFC HEASARC help desk heasarc-vo at athena.gsfc.nasa.gov Survey Source This table contains the results of a detailed X-ray spectral analysis of the sources in the 1 Ms catalog of the Chandra Deep Field South (CDFS, Giacconi et al. 2002, <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/139/369">CDS Cat. J/ApJS/139/369</a>, available in Browse as the CHANDFS1MS table), taking advantage of optical spectroscopy and photometric redshifts for 321 extragalactic sources out of the total sample of 347 sources. As a default spectral model, the authors adopt a power law with a slope Gamma with an intrinsic redshifted absorption N<sub>H</sub>, a fixed Galactic absorption and an unresolved Fe emission line. For 82 X-ray bright sources, they are able to perform the X-ray spectral analysis leaving both Gamma and N<sub>H</sub> free. The weighted mean value for the slope of the power law is 1.75 +/- 0.02, and the distribution of best fit values shows an intrinsic dispersion of 0.30. The authors do not find hints of a correlation between the spectral index Gamma and the intrinsic absorption column density N<sub>H</sub>. They then investigate the absorption distribution for the whole sample, deriving the N<sub>H</sub> values in faint sources by fixing Gamma to be 1.8. The authors find that the fraction of absorbed sources (with N<sub>H</sub> > 10<sup>22</sup> cm<sup>-2</sup>) in the sample is constant (at the level of about 75%) or moderately increasing with redshift. Finally, they compare the optical classification to the X-ray spectral properties, confirming that the correspondence of unabsorbed (absorbed) X-ray sources to optical type I (type II) AGN is accurate for at least 80% of the sources with spectral identification (1/3 of the total X-ray sample). This table was created by the HEASARC in August 2007 primarily based on <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/A+A/451/457">CDS Catalog J/A+A/451/457</a> file table1.dat. The positions of the X-ray sources were taken from <a href="https://cdsarc.cds.unistra.fr/ftp/cats/J/ApJS/139/369">CDS Catalog J/ApJS/139/369</a> (Giacconi et al. 2002), except for that of source number 901 which was taken from Table 5 of Szokoly et al. (2004, ApJS, 155, 271). This is a service provided by NASA HEASARC . 2002ApJS..139..369G https://heasarc.gsfc.nasa.gov/W3Browse/all/cdfsagncxo.html Catalog Research served-by HEASARC TAP https://heasarc.gsfc.nasa.gov/xamin/vo/cone?showoffsets&table=cdfsagncxo& GET text/xml 180 99999 true 53.126 -28.00621111 0.0166666666666667 https://heasarc.gsfc.nasa.gov/xamin/vo/tap https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/getvotable.pl?name=cdfsagncxo GET text/xml https://heasarc.gsfc.nasa.gov/cgi-bin/W3Browse/w3query.pl?tablehead=name=heasarc_cdfsagncxo&Action=More+Options&Action=Parameter+Search&ConeAdd=1 CHANDRA 0.0166666666666667 Optical X-ray public cdfsagncxo Chandra Deep Field South AGN Spectral Properties Catalog name Source Designation, [GZW2002] XID NNN in SIMBAD meta.id;meta.main char nullable ra Right Ascension degree pos.eq.ra;meta.main double nullable dec Declination degree pos.eq.dec;meta.main double nullable redshift Redshift src.redshift double nullable sb_lx Soft-Band (0.5-2keV) Luminosity (erg/s) erg/s phys.luminosity;em.X-ray.soft double nullable hb_lx Hard-Band (2-10keV) Luminosity (erg/s) erg/s phys.luminosity;em.X-ray.medium double nullable spectral_index Spectral Slope (1.8 = Fixed Value) spect.index;em.X-ray double nullable "__x_ra_dec" System unit vector column double nullable "__y_ra_dec" System unit vector column double nullable "__z_ra_dec" System unit vector column double nullable "__row" System index column char nullable spectral_index_pos_err Error on Gamma (Upper Limit) stat.error;spect.index;em.X-ray double nullable nh_pos_err Error on NH (Upper Limit) H-atoms/cm^2 stat.error;phys.columnDensity double nullable sb_flux Soft-Band (0.5-2keV) Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.soft double nullable nh Intrinsic Absorption H Column Density (150.00 = Fixed Value) H-atoms/cm^2 phys.columnDensity double nullable nh_neg_err Error on NH (Lower Limit) H-atoms/cm^2 stat.error;phys.columnDensity double nullable lii Galactic Longitude degree pos.galactic.lon double nullable redshift_flag Flag Indicates Optical Spectral Quality meta.code;src.redshift double nullable xtype X-Type Indicates Best Fit Model meta.code char nullable spectral_index_neg_err Error on Gamma (Lower Limit) stat.error;spect.index;em.X-ray double nullable hb_flux Hard-Band (2-10keV) Flux (erg/s/cm^2) erg/s/cm^2 phot.flux;em.X-ray.medium double nullable source_number Sequential Identification Number for Each Source in Catalog meta.id short nullable bii Galactic Latitude degree pos.galactic.lat double nullable