Preprint article · Journal article
NuSTAR Hard X-Ray Observation of the Gamma-Ray Binary Candidate HESS J1832–093
Columbia University1
Institute of Space Sciences2
Harvard-Smithsonian Center for Astrophysics3
University of California at Berkeley4
Massachusetts Institute of Technology5
National Space Institute, Technical University of Denmark6
Astrophysics and Atmospheric Physics, National Space Institute, Technical University of Denmark7
California Institute of Technology8
NASA Goddard Space Flight Center9
We present a hard X-ray observation of the TeV gamma-ray binary candidate HESS J1832−093, which is coincident with the supernova remnant G22.7−0.2, using the Nuclear Spectroscopic Telescope Array. Non-thermal X-ray emission from XMMU J183245−0921539, the X-ray source associated with HESS J1832−093, is detected up to ~30 keV and is well-described by an absorbed power-law model with a best-fit photon index .
A re-analysis of archival Chandra and XMM-Newton data finds that the long-term X-ray flux increase of XMMU J183245−0921539 is (90% C.L.), much less than previously reported. A search for a pulsar spin period or binary orbit modulation yields no significant signal to a pulse fraction limit of in the range 4 ms ks.
No red noise is detected in the FFT power spectrum to suggest active accretion from a binary system. While further evidence is required, we argue that the X-ray and gamma-ray properties of XMMU J183245−0921539 are most consistent with a non-accreting binary generating synchrotron X-rays from particle acceleration in the shock formed as a result of the pulsar and stellar wind collision.
We also report on three nearby hard X-ray sources, one of which may be associated with diffuse emission from a fast-moving supernova fragment interacting with a dense molecular cloud.
Language: | English |
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Publisher: | American Astronomical Society |
Year: | 2017 |
Pages: | 80 |
ISSN: | 15384357 and 0004637x |
Types: | Preprint article and Journal article |
DOI: | 10.3847/1538-4357/aa8d15 |
ORCIDs: | Christensen, Finn Erland , 0000-0002-9709-5389 , 0000-0003-3847-3957 , 0000-0001-7655-4120 , 0000-0001-5506-9855 , 0000-0002-2967-790X , 0000-0003-2992-8024 , 0000-0003-2686-9241 and 0000-0002-1426-9698 |