Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003head....7.3702y&link_type=abstract
American Astronomical Society, HEAD meeting #7, #37.02; Bulletin of the American Astronomical Society, Vol. 35, p.652
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the first results from a wide solid angle, moderately deep Chandra survey of the Lockman Hole North West Region. Our 9 ACIS-I fields cover an effective solid angle of 0.4 deg2 and reach a depth of 3 x 10-16 erg cm-2 s-1 in the 0.4--2 keV band and 3 x 10-15 erg cm-2 s-1 in the 2--8 kev band. The best fit logN-logS for the entire field, the largest contiguous Chandra field yet observed, matches well onto that of the Chandra Deep Field North. This indicates that over 90% of the 2--8 keV X-ray background is resolved into point sources. We show that the full range of the `cosmic variance' previously seen in different Chandra fields is reproduced in this small region of the sky. Analysis of the counts-in-cells shows that the hard band sources are more strongly correlated than the soft band sources.
Barger Amy. J.
Cowie Lennox L.
Mushotzky Richard F.
Sanders David B.
Steffen Aaron T.
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