Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.2102c&link_type=abstract
American Astronomical Society, HEAD meeting #11, #21.02; Bulletin of the American Astronomical Society, Vol. 41, p.692
Astronomy and Astrophysics
Astronomy
Scientific paper
Cygnus X-3 is a high-mass X-ray binary with a Wolf-Rayet star companion and with a short orbital period. It occasionally becomes one of the brightest radio source among the Galactic binary systems, with major flares from its relativistic jets. In the 1970's and early 1980's, it was postulated to be a source of high and very high energy gamma rays, that generated considerable excitement in the field of gamma-ray astronomy. With its unprecedented sensitivity, the Large Area Telescope (LAT) aboard the Fermi Gamma-Ray Space Telescope continuously scans the entire sky every 3 hours and is ideally suited to probe the high energy emission of binary systems. Here, we will report the results of one year of observations with the LAT of the very crowded Cygnus region, with specific focus on the microquasar Cygnus X-3
The Fermi Large Area Telescope has detected a variable high energy source coinciding with the position of the X-ray binary and microquasar Cygnus X-3. Its identification with Cygnus X-3 is secured by the detection of its orbital period in gamma rays, as well as the correlation of the LAT flux with radio emission from the relativistic jets of Cygnus X-3. The gamma-ray emission likely originates from within the binary system, opening new areas in which to study the formation of relativistic jets.
Corbel Stephane
Fermi LAT Collaboration
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