Identification of the Hard X-Ray Source Dominating the E > 25 keV Emission of the Nearby Galaxy M31

  title={Identification of the Hard X-Ray Source Dominating the E > 25 keV Emission of the Nearby Galaxy M31},
  author={Mihoko Yukita and Andy Ptak and A Hornschemeier and Daniel R. Wik and Thomas J. Maccarone and Katja Pottschmidt and Andreas Zezas and Vallia Antoniou and Ralf Ballhausen and Bret D. Lehmer and A. Y. Lien and Barbara Ann Williams and Frederick K. Baganoff and Patricia T. Boyd and Teruaki Enoto and Jamie A. Kennea and Kim L. Page and Y. Choi},
  journal={The Astrophysical Journal},
We report the identification of a bright hard X-ray source dominating the M31 bulge above 25 keV from a simultaneous NuSTAR–Swift observation. We find that this source is the counterpart to Swift J0042.6+4112, which was previously detected in the Swift BAT All-sky Hard X-ray Survey. This SwiftBAT source had been suggested to be the combined emission from a number of point sources; our new observations have identified a single X-ray source from 0.5 to 50 keV as the counterpart for the first time… 

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