Imaging Large-Scale Structure in the X-Ray Sky

We present the first results from a wide solid angle, moderately deep {\itChandra} survey of the Lockman Hole North-West region. Our 9 ACIS-I fieldscover an effective solid angle of 0.4 deg$^{2}$ and reach a depth of $3 \times10^{-16}$ \ergpcmsqps in the 0.4--2 keV band and $3 \times 10^{-15}$\ergpcmsqps in the 2--8 keV band. The best fit logN-logS for the entire field,the largest contiguous {\it Chandra} field yet observed, matches well onto thatof the {\it Chandra} Deep Field North. We show that the full range of the`cosmic variance' previously seen in different {\it Chandra} fields isreproduced in this small region of the sky. Counts-in-cells analysis shows thatthe hard band sources are more strongly correlated than the soft band sources.Comment: To be published in ApJL v58