2019ApJ...882..112X -
Astrophys. J., 882, 112-112 (2019/September-2)
The likely Fermi detection of the be X-ray binary GRO J1008-57.
XING Y. and WANG Z.
Abstract (from CDS):
In our search for γ-ray emission from Be X-ray binaries from the analysis of the data obtained with the Large Area Telescope onboard the Fermi Gamma-Ray Space Telescope, we find likely detection of GRO J1008-57. The binary has an orbital period of 249.48 days, and it is only significantly detected in its orbital phase 0.8-0.9 (>4σ). Further light-curve analysis indicates that the detection is probably largely due to an emitting event in one orbital cycle around year 2012-2013, following a giant X-ray outburst of the source. This property of having occasional γ-ray emitting events is similar to that seen in another high-mass X-ray binary (HMXB) 4U 1036-56. However, models considering possible γ-ray emission from an accreting neutron star have difficulty in explaining the observed ∼1034 erg s–1 luminosity of the source, unless the distance was largely overestimated. Further observational studies are required, in order to more clearly establish the high-energy emission properties of GRO J1008-57 or similar HMXBs and find clues for understanding how γ-ray emission is produced from them.
Abstract Copyright:
© 2019. The American Astronomical Society. All rights reserved.
Journal keyword(s):
gamma rays: stars - pulsars: individual: GRO J1008-57 - stars: neutron
Simbad objects:
15
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