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P. J. Green (CXC/SAO), F. H. Chaffee (Keck), R. Cameron (CXC/SAO), S. N. Virani (CXC/SAO), A. Dey (NOAO), B. Jannuzi (NOAO), A. Kindt (MSU), L. VanSpeybroeck (SAO), H. Tananbaum (CXC/SAO), B. Wilkes (CXC/SAO), ChaMP Collaboration
We describe the X-ray and optical characteristics of faint serendipitous X-ray sources detected during a deep (120ksec) Chandra exposure with ACIS. While the target is MS 1137.5+6625, the second most distant cluster of galaxies in the Einstein Extended Medium Sensitivity Survey (EMSS) at redshift 0.78, as part of the Chandra Multiwavelength Project (ChaMP), we obtained Keck spectroscopy of a dozen optical counterparts in an adjacent field (7 arcmin off-axis) that reveals an intriguing variety of objects, dominated by AGN and galaxies between redshifts of 0.5 to 2.
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