Polarized Gamma-ray Emission From The Galactic Black Hole Cygnus X-1

Details Polarized Gamma-ray Emission From The Galactic Black Hole Cygnus X-1 Polarized Gamma-ray Emission From The Galactic Black Hole Cygnus X-1

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011xau5.confe..34l&link_type=abstract

"The Second Ferrara Workshop on "X-ray Astrophysics up to 511 keV", held in Ferrara (Italy), September 14 - 16, 2011, article #3

Astronomy and Astrophysics

Astrophysics

Scientific paper

Because of their inherently high flux allowing the detection of clear signals, black hole X-ray binaries are interesting candidates for polarization studies, even if no polarization signals have been observed from them before. Such measurements would provide further detailed insight into these sources' emission mechanisms. We measured the polarization of the gamma-ray emission from the black hole binary system Cygnus X-1 with the INTEGRAL/IBIS telescope. Spectral modeling of the data reveals two emission mechanisms: The 250- to 400-keV data are consistent with emission dominated by Compton scattering on thermal electrons and are weakly polarized. The second spectral component seen in the 400-keV to 2-MeV band is by contrast strongly polarized, revealing that the MeV emission is probably related to the jet first detected in the radio band.

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