Session 37. Cosmic X-ray Background and Deep Surveys II
Oral, Tuesday, March 25, 2003, 9:00-10:00am

## [37.02] Imaging Large Scale Structure in the X-ray Sky

Y. Yang (UMCP), R.F. Mushotzky (NASA/GSFC), L.L. Cowie (U.Hawaii/IfA), A.J. Barger (U.Wisconsin, U.Hawaii/IfA), D.B. Sanders (U.Hawaii/IfA), A.T. Steffen (U.WIsconsin)

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 \times 10-16 erg cm-2 s-1 in the 0.4--2 keV band and 3 \times 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.