Periodic Emission from the Gamma-Ray Binary 1FGL J1018.6-5856
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.
- Publication:
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Science
- Pub Date:
- January 2012
- DOI:
- 10.1126/science.1213974
- arXiv:
- arXiv:1202.3164
- Bibcode:
- 2012Sci...335..189F
- Keywords:
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- ASTRONOMY;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- Contact authors: R.H.D. Corbet, M. Kerr, C.C. Cheung