Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943301c&link_type=abstract
American Astronomical Society, AAS Meeting #219, #433.01
Astronomy and Astrophysics
Astronomy
Scientific paper
We present the discovery of a new gamma-ray binary system from a search for periodic modulation in the Fermi LAT light curves of all sources in the first Fermi-LAT catalog. 1FGL J1018.6-5856 was found to have a 16.6 day modulation in its gamma-ray flux that is accompanied by spectral variability. We identify counterparts in the X-ray, radio, and optical wavebands using data from the Swift XRT, ATCA, and telescopes at SAAO and LCO. The X-ray and radio counterparts are highly variable: the X-ray flux appears to be modulated on the orbital period with maximum X-ray flux coinciding with the phase of maximum gamma-ray flux. The optical counterpart has a spectral type of approximately O6V((f)) and shows little variability in a series of Swift UVOT observations. The overall properties of 1FGL J1018.6-5856 indicate that it is a member of the rare gamma-ray binary class of objects, and that it shares several properties with LS 5039. However, there are some differences from LS 5039, including the relative phasing of the gamma-ray flux and spectral modulation and the shape of the X-ray light curve. We conclude that 1FGL J1018.6-5856 is a new gamma-ray binary, and its discovery suggests that Fermi has begun to reveal the predicted population of such objects.
Coe Malcolm J.
Corbet Robin H. D.
Di Mille Francesco
Edwards Philip G.
Fermi LAT Collaboration
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