Identification of the Hard X-Ray Source Dominating the E > 25 keV Emission of the Nearby Galaxy M31
作者： B. D. Lehmer , A. Lien , B. Williams , F. Baganoff , P. T. Boyd
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摘要: We report the identification of a bright hard X-ray source dominating M31 bulge above 25 keV from simultaneous NuSTAR–Swift observation. find that this is counterpart to Swift J0042.6+4112, which was previously detected in BAT All-sky Hard Survey. This SwiftBAT had been suggested be combined emission number point sources; our new observations have identified single 0.5 50 as for first time. In 0.5–10 band, classified an Binary candidate various Chandra and XMM-Newton studies; however, since it not clearly associated with previous E 3 M⊙) donors at location source. The best interpretation nature pulsar intermediate-mass (<3 companion or symbiotic binary. discuss other possibilities more detail.
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