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arxiv: 2206.09972 · v2 · pith:OGFXQV33new · submitted 2022-06-20 · 🌌 astro-ph.HE · gr-qc

Polarized x-rays constrain the disk-jet geometry in the black hole x-ray binary Cygnus X-1

Henric Krawczynski , Fabio Muleri , Michal Dov\v{c}iak , Alexandra Veledina , Nicole Rodriguez Cavero , Jiri Svoboda , Adam Ingram , Giorgio Matt
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Javier A. Garcia Vladislav Loktev Michela Negro Juri Poutanen Takao Kitaguchi Jakub Podgorn\'y John Rankin Wenda Zhang Andrei Berdyugin Svetlana V. Berdyugina Stefano Bianchi Dmitry Blinov Fiamma Capitanio Niccol\`o Di Lalla Paul Draghis Sergio Fabiani Masato Kagitani Vadim Kravtsov Sebastian Kiehlmann Luca Latronico Alexander A. Lutovinov Nikos Mandarakas Fr\'ed\'eric Marin Andrea Marinucci Jon Miller Tsunefumi Mizuno Sergey V. Molkov Nicola Omodei Pierre-Olivier Petrucci Ajay Ratheesh Takeshi Sakanoi Andrei N. Semena Raphael Skalidis Paolo Soffitta Allyn F. Tennant Phillipp Thalhammer Francesco Tombesi Martin C. Weisskopf Joern Wilms Sixuan Zhang Iv\'an Agudo Lucio A. Antonelli Matteo Bachetti Luca Baldini Wayne H. Baumgartner Ronaldo Bellazzini Stephen D. Bongiorno Raffaella Bonino Alessandro Brez Niccol\`o Bucciantini Simone Castellano Elisabetta Cavazzuti Stefano Ciprini Enrico Costa Alessandra De Rosa Ettore Del Monte Laura Di Gesu Alessandro Di Marco Immacolata Donnarumma Victor Doroshenko Steven R. Ehlert Teruaki Enoto Yuri Evangelista Riccardo Ferrazzoli Shuichi Gunji Kiyoshi Hayashida Jeremy Heyl Wataru Iwakiri Svetlana G. Jorstad Vladimir Karas Jeffery J. Kolodziejczak Fabio La Monaca Ioannis Liodakis Simone Maldera Alberto Manfreda Alan P. Marscher Herman L. Marshall Ikuyuki Mitsuishi C.-Y. Ng Stephen L. O'Dell Chiara Oppedisano Alessandro Papitto George G. Pavlov Abel L. Peirson Matteo Perri Melissa Pesce-Rollins Maura Pilia Andrea Possenti Simonetta Puccetti Brian D. Ramsey Roger W. Romani Carmelo Sgr\`o Patrick Slane Gloria Spandre Toru Tamagawa Fabrizio Tavecchio Roberto Taverna Yuzuru Tawara Nicolas E. Thomas Alessio Trois Sergey Tsygankov Roberto Turolla Jacco Vink Kinwah Wu Fei Xie Silvia Zane
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classification 🌌 astro-ph.HE gr-qc
keywords x-raybinaryblackholecygnusemittingx-raysaccretes
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A black hole x-ray binary (XRB) system forms when gas is stripped from a normal star and accretes onto a black hole, which heats the gas sufficiently to emit x-rays. We report a polarimetric observation of the XRB Cygnus X-1 using the Imaging x-ray Polarimetry Explorer. The electric field position angle aligns with the outflowing jet, indicating that the jet is launched from the inner x-ray emitting region. The polarization degree is (4.01+-0.20)% at 2 to 8 kiloelectronvolts, implying that the accretion disk is viewed closer to edge-on than the binary orbit. The observations reveal that hot x-ray emitting plasma is spatially extended in a plane perpendicular to the jet axis, not parallel to the jet.

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