Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21931804s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #318.04
Astronomy and Astrophysics
Astrophysics
Scientific paper
With frequent flaring activity of its relativistic jets, Cygnus X-3 (Cyg X-3) is one of the most active Galactic microquasars. It is also the only Galactic black hole candidate with confirmed high energy gamma-ray emission thanks to detections by Fermi/LAT and AGILE. In early 2011 February, Cyg X-3 was observed to transit to a soft X-ray state, a period known to be associated with high energy gamma-ray emission. A giant ( 20 Jy) optically thin radio flare marked the end of the soft state. Fermi/LAT observations (E > 100 MeV) revealed gamma-ray activity associated with the giant radio flare. In addition, the observations unambiguously showed that the gamma-ray emission is not exclusively related to the spectacular and rare giant radio flares. A 3-week period of gamma-ray emission was also detected earlier during soft state, when Cyg X-3 was weakly flaring in radio, with 15 GHz peak flux density of 0.6 Jy. We present the results of a multi-wavelength campaign (which included data from OVRO, AMI, Ratan, RXTE/ASM, MAXI, Swift/BAT, Fermi/LAT), covering a period of the giant radio flare. We identify fluxes in radio and hard X-rays which could potentially be used as trigger criteria for further pointed observations in X-rays and other bands. JAT acknowledges partial support from NASA Fermi Guest Observer award NNX10AP83G and from NASA Astrophysics Data Analysis Program award NNX11AF84G. GD acknowledges support by the European Community contract ERC-StG-200911.
Corbel Sephane
Dubus Guillaume
Fermi LAT Collaboration
Szostek Anna
Tomsick John A.
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