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Periodic Emission from the Gamma-ray Binary 1FGL J1018.6-5856Gamma-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 IFGL JI018.6-5856 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 06V f) star optical counterpart and a radio counterpart that is also apparently modulated on the orbital period. IFGL J1018.6-5856 is thus a gamma-ray binary, and its detection suggests the presence of other fainter binaries in the Galaxy.
Document ID
20120014293
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
External Source(s)
doi:10.1126/science.1213974
Authors
Celic, O. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Corbet, R. H. D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Donato, D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ferrara, E. C. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Gehrels, N. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Harding, A. K. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hays, E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
McEnery, J. E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Thompson, D. J. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Troja, E. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 26, 2013
Publication Date
January 13, 2012
Publication Information
Publication: Science
Volume: 335
Issue: 6065
Subject Category
Astronomy
Report/Patent Number
GSFC.JA.6544.2012
Report Number: GSFC.JA.6544.2012
Distribution Limits
Public
Copyright
Public Use Permitted.

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