Chandra Cygnus OB2 Legacy Survey: X-ray Catalog

The Chandra Cygnus OB2 Legacy Survey is a large imaging program undertaken with the Advanced CCD Imaging Spectrometer onboard the Chandra X-ray Observatory. The survey has imaged the central 0.5deg^2^ of the Cyg OB2 association with an effective exposure of 120ks and an outer 0.35 deg^2^ area with an exposure of 60ks.

Here we describe the survey design and observations, the data reduction and source detection, and present a catalog of 8,000 X-ray point sources. The survey design employs a grid of 36 heavily (~50%) overlapping pointings, a method that overcomes Chandra's low off-axis sensitivity and produces a highly uniform exposure over the inner 0.5deg^2^. The full X-ray catalog is described here and is made available online.