Imaging large-scale structure in the X-ray sky

We present the first results from a wide solid angle, moderately deep Chandra survey of the Lockman Hole North-West region. Our nine ACIS-I fields cover an effective solid angle of 0.4 deg(2) and reach a depth of 3 x 10(-16) ergs cm(-2) s(-1) in the 0.4-2 keV band and 3 x 10(-15) ergs cm(-2) s(-1) in the 2-8 keV band. The best-fit log N-log S for the entire field matches well onto that of the Chandra Deep Field-North. 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. A counts-in-cells analysis shows that the hard-band sources are more strongly correlated than the soft-band sources.