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147 serendipitous X-ray sources with hard spectra (spectral indices Alpha < 0.5) were selected from a survey of 188 ROSAT fields. The catalog, created by NASA HEASARC in March 2012, suggests these hard sources are dominant contributors to the X-ray background at faint fluxes. Monte Carlo simulations indicate the survey's effective area for hard sources is >=10 times greater than for soft sources above a specific flux level.
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