Mathematics – Probability
Scientific paper
Sep 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009cfdd.confe.133k&link_type=abstract
Chandra's First Decade of Discovery, Proceedings of the conference held 22-25 September, 2009 in Boston, MA. Edited by Scott Wo
Mathematics
Probability
Source Catalogs, Software
Scientific paper
We present the result of cross-correlation between Chandra Source Catalog (CSC) and SDSS DR7. First, we compared CSC and ChaMP X-ray sources and found consistent results in detecting sources and their X-ray properties with a very small number of exceptional cases. By visual examination, we identified and excluded optically saturated stars with incorrect optical properties which often cause multiple matches. We have identified ˜13500 CSC X-ray sources which match with SDSS optical sources. There are ˜5000 X-ray sources with possible optical counterparts but with a higher probability of random coincidence. Additionally, there are ˜10000 X-ray sources with no SDSS optical counterpart. Among the matched sources, 85% have fx/fo between 0.1 and 10 (consistent being AGNs) and 10% have fx/fo less than 0.1 (likely normal galaxies). We further discuss different types of objects, in terms of their redshift distributions and spectral properties.
Fabbiano Pepi
Green Paul
Kim Dong-Woo
Mossman Amy
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