Polarized Gamma-Ray Emission from the Galactic Black Hole Cygnus X-1

被引：191

作者：

Laurent, P. ^{[1
]}

Rodriguez, J. ^{[2
]}

Wilms, J. ^{[3
]}

Bel, M. Cadolle ^{[4
]}

Pottschmidt, K. ^{[5
,6
,7
]}

Grinberg, V. ^{[3
]}

机构：

[1] Commissariat Energie Atom & Energies Alternat, Inst Rech Lois Fondamentales Univers CEA IRFU, F-75205 Paris 13, France

[2] Univ Paris Diderot, Inst Natl Sci Univers, CEA Saclay, DSM,IRFU,SAp,CEA,Lab AIM,CNRS, F-91191 Gif Sur Yvette, France

[3] Univ Erlangen Nurnberg, Dr Karl Remeis Sternwarte & Erlangen Ctr Astropar, D-96049 Bamberg, Germany

[4] European Space Astron Ctr, Sci Operat Dept, Int Gamma Ray Astrophys Lab INTEGRAL Sci Operat C, E-28691 Madrid, Spain

[5] CRESST, Greenbelt, MD 20771 USA

[6] NASA, Goddard Space Flight Ctr, Astrophys Sci Div, Greenbelt, MD 20771 USA

[7] Univ Maryland Baltimore Cty, Ctr Space Sci & Technol, Baltimore, MD 21250 USA

来源：

SCIENCE | 2011年 / 332卷 / 6028期

关键词：

BROAD-BAND SPECTRUM; X-RAY; ACCRETION DISKS; LOW/HARD STATE; RADIATION; JETS; TELESCOPE; IBIS;

D O I：

10.1126/science.1200848

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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 International Gamma-Ray Astrophysics Laboratory Imager on Board the Integral Satellite (INTEGRAL/IBIS) telescope. Spectral modeling of the data reveals two emission mechanisms: The 250- to 400-keV ( kilo-electron volt) 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.

引用

页码：438 / 439

页数：2

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