The Chandra Source Catalog: X-ray Aperture Photometry

Details The Chandra Source Catalog: X-ray Aperture Photometry The Chandra Source Catalog: X-ray Aperture Photometry

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21347209k&link_type=abstract

American Astronomical Society, AAS Meeting #213, #472.09; Bulletin of the American Astronomical Society, Vol. 41, p.425

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The Chandra Source Catalog represents a reanalysis of the entire ACIS and HRC imaging observations over the 9-year Chandra mission. Source detection is carried out on a uniform basis, using the CIAO tool wavdetect, and source fluxes are estimated post-facto using a Bayesian method that accounts for background, spatial resolution effects, and contamination from nearby sources. We use gamma-function prior distributions, which could be either non-informative, or in case there exist previous observations of the same source, strongly informative. The resulting posterior probability density functions allow us to report the flux and a robust credible range on it. We also determine limiting sensitivities at arbitrary locations in the field using the same formulation. This work was supported by CXC NASA contracts NAS8-39073 (VK) and NAS8-03060 (CSC).

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