Fermi-LAT data spanning 15 years yield a power-law GeV spectrum for HESS J0632+057 with a possible 10-100 GeV turnover, and FAST observations set a 2 microJy upper limit on radio pulsations from the system.
Periodic Emission from the Gamma-ray Binary 1FGL J1018.6-5856
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abstract
Gamma-ray binaries are stellar systems containing a neutron star or black hole with gamma-ray emission produced by an interaction between the components. These systems are rare, even though binary evolution models predict dozens in our Galaxy. A search for gamma-ray binaries with the Fermi Large Area Telescope (LAT) shows that 1FGL J1018.6-5856 exhibits intensity and spectral modulation with a 16.6 day period. We identified a variable X-ray counterpart, which shows a sharp maximum coinciding with maximum gamma-ray emission, as well as an O6V((f)) star optical counterpart and a radio counterpart that is also apparently modulated on the orbital period. 1FGL J1018.6-5856 is thus a gamma-ray binary, and its detection suggests the presence of other fainter binaries in the Galaxy.
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Fermi-LAT and FAST observation of the gamma-ray binary HESS J0632+057
Fermi-LAT data spanning 15 years yield a power-law GeV spectrum for HESS J0632+057 with a possible 10-100 GeV turnover, and FAST observations set a 2 microJy upper limit on radio pulsations from the system.