XMM-COSMOS and Chandra-COSMOS photometric redshift catalogs
Updated XMM-COSMOS photometric redshift catalog. This photometric redshift catalog superseeds the version presented in Salvato et al. 2009, ApJ, 690, 1250.
The addition of H-band photometry and the revised strategy in treating the extended, optically non varying, faint X-ray sources in the EXTNV XMM-COSMOS sample, resulted in a change in redshift Δz > 0.2 for 248 sources ( about 15% of the total XMM-COSMOS sample).
The improved accuracy with respect to the old version of the photo-z (Salvato et al. 2009) is summarized in Table 3 of Salvato et al. 2011, ApJ, submitted.
It is reassuring that the introduction of the H-band photometry does not effect the accuracy of the QSOV sample, indicating a reliability on our photo-z in the field.
NEW: Photometric redshift catalog for Chandra detected sources in the central 0.9 square degrees of the COSMOS field.
The detailed procedure and the comparison between the Chandra- and XMM- population is presented in Salvato et al. 2011, ApJ, submitted.
The README file, valid for both catalogs, is available here.
Both files include only X-ray sources for which was possible to compute photometric redshifts.
A complete XMM-COSMOS source catalog can be found here, as described in Brusa et al. 2010, ApJ, 716, 348. Soon publicly avaialble also the Chandra-COSMOS source catalog.
More details and information can be found in Salvato et al. 2009 and Salvato et al 2011.
In short, we used two set of templates:
Library dominated by AGN templates. This library deals with i)X-ray sources that are point-like and/or optically varying
and ii)bright X-ray sources that are morphologically extended.
Only 6 of the 30 templates are from normal galaxies.
The rest are pure AGN templates or hybrids. The original templates are extracted from the library of M. Polletta and can be found here.
Library of normal galaxy templates. These templates have been used for the normal galaxies in the COSMOS field as described in Ilbert et al. 2009, ApJ, 690, 1236.
The same templates are now used for faint X-ray sources that are extended, as described in Salvato et al. 2011.
NOTE THAT, in order to add the emission lines, the templates need to be processed by Le Phare.
| Mara Salvato, Last update: 20/06/2011[Disclaimer]