Periodic emission from the gamma-ray binary 1FGL J1018.6-5856 |
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| Authors: | Fermi LAT Collaboration Ackermann M Ajello M Ballet J Barbiellini G Bastieri D Belfiore A Bellazzini R Berenji B Blandford R D Bloom E D Bonamente E Borgland A W Bregeon J Brigida M Bruel P Buehler R Buson S Caliandro G A Cameron R A Caraveo P A Cavazzuti E Cecchi C Çelik Ö Charles E Chaty S Chekhtman A Cheung C C Chiang J Ciprini S Claus R Cohen-Tanugi J Corbel S Corbet R H D Cutini S de Luca A den Hartog P R de Palma F Dermer C D Digel S W do Couto e Silva E Donato D Drell P S Drlica-Wagner A Dubois R Dubus G Favuzzi C Fegan S J Ferrara E C Focke W B Fortin P Fukazawa Y Funk S Fusco P |
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| Affiliation: | W. W. Hansen Experimental Physics Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics and SLAC National Accelerator Laboratory, Stanford University, Stanford, CA 94305, USA. |
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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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