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NuSTAR Hard X-ray Observation of the Gamma-ray Binary Candidate HESS J1832-093 | | Kaya Mori
; E. V. Gotthelf
; Charles J. Hailey
; Ben J. Hord
; Emma de Ona Wilhelmi
; Farid Rahoui
; John A. Tomsick
; Shuo Zhang
; Jaesub Hong
; Amani M. Garvin
; Steven E. Boggs
; Finn E. Christensen
; William W. Craig
; Fiona A. Harrison
; Daniel Stern
; William W. Zhang
; | | Date: |
5 Oct 2017 | | Abstract: | We present a hard X-ray observation of the TeV gamma-ray binary candidate
HESS J1832-093 coincident with supernova remnant (SNR) G22.7-0.2 using the
Nuclear Spectroscopic Telescope Array (NuSTAR). 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 the best-fit photon index $Gamma = 1.5pm0.1$. A re-analysis of archival
Chandra and XMM-Newton data finds that the long-term X-ray flux increase of
XMMU J183245-0921539 is $50^{+40}_{-20}$% (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 fp < 19% in the range 4 ms <
P < 40 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. | | Source: | arXiv, 1710.2118 | | Services: | Forum | Review | PDF | Favorites | |
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