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The Massive Young star-forming complex Study in Infrared and X-ray (MYStIX)uses data from the Chandra X-ray Observatory to identify and characterize theyoung stellar populations in twenty Galactic (d < 4 kpc) massive star-formingregions. Here, the X-ray analysis for Chandra ACIS-I observations of ten of theMYStIX fields is described, and a catalog of >10,000 X-ray sources ispresented. In comparison to other published Chandra source lists for the sameregions, the number of MYStIX detected faint X-ray sources in a region is oftendoubled. While the higher catalog sensitivity increases the chance of falsedetections, it also increases the number of matches to infrared stars. X-rayemitting contaminants include foreground stars, background stars, andextragalactic sources. The X-ray properties of sources in these classes arediscussed.

A Massive Young Star-Forming Complex Study in Infrared and X-ray: X-ray Sources in Ten Star Forming Regions