Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4603t&link_type=abstract
American Astronomical Society, AAS Meeting #211, #46.03; Bulletin of the American Astronomical Society, Vol. 39, p.801
Astronomy and Astrophysics
Astronomy
Scientific paper
This work is one in a series focusing on results from three of the most spectroscopically complete Chandra hard X-ray surveys; the Chandra Deep Field North, the Chandra Large Area Synoptic X-ray Survey (CLASXS), and the Chandra Lockman Area North Survey (CLANS; also known as the Chandra/SWIRE survey). Above 1e-14 ergs/cm2/s (0.5-2 keV), 80-90% of the sources in these fields have redshifts; below, 60% have redshifts. In this poster we present the X-ray catalog for the wide-area, moderately deep CLANS survey. The nine ACIS-I fields cover a solid angle of 0.65 square degrees and reach fluxes of 1e-16 ergs/cm2/s (0.5-2 keV) and 2e-15 ergs/cm2/s (2-8 keV). We find a total of 761 X-ray point sources. This survey, along with CLASXS, bridges the gap between the ultradeep pencil-beam surveys, such as the Chandra Deep Fields, and shallower, large-area surveys, allowing a better probe of the X-ray sources that contribute most of the 2-10 keV cosmic X-ray background. Furthermore, we present the optical and near-infrared photometric and spectroscopic observations of the CLANS X-ray sources. We also include updated photometric and spectroscopic data for CLASXS and the CDFN. Because these fields are so highly spectroscopically complete, we are able to compare and contrast the X-ray and optical spectral properties of the obscured versus unobscured AGN in our sample. While the majority of the sources show good agreement between their X-ray and optical classification, some sources that appear unobscured under X-ray classification are optically narrow; and vice-versa. This has important ramifications on the creation of luminosity functions. With this data set, we are able to compare hard X-ray luminosity functions for the X-ray obscured and unobscured sources and the optically spectroscopically identified broad-line and narrow-line AGN.
A National Science Foundation Graduate Research Fellowship has provided the funding for this project.
Barger Amy
Cowie Lennox L.
Mushotzky Richard
Trouille Laura
Yang Yadong
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