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

  title={Polarized x-rays constrain the disk-jet geometry in the black hole x-ray binary Cygnus X-1},
  author={Henric Krawczynski and Fabio Muleri and Michal Dov{\vc}iak and Alexandra Veledina and Nicole Rodriguez Cavero and Jiř{\'i} Svoboda and Adam Ingram and Giorgio Matt and Javier A. Garc{\'i}a and Vladislav Loktev and Michela Negro and Juri Poutanen and Takao Kitaguchi and Jakub Podgorn'y and John Rankin and Wenda Zhang and Andrei Berdyugin and Svetlana V. Berdyugina and Stefano Bianchi and Dmitry Blinov and Fiamma Capitanio and Niccolo’ Di Lalla and Paul A. Draghis and Sergio Fabiani and Masato Kagitani and Vadim Kravtsov and Sebastian Kiehlmann and Luca Latronico and Alexander A. Lutovinov and Nikos Mandarakas and Fr{\'e}d{\'e}ric Marin and Andrea Marinucci and Jonathan M. Miller and Tsunefumi Mizuno and Sergey V. Molkov and Nicola Omodei and P.-O. Petrucci and Ajay Ratheesh and Takeshi Sakanoi and Andrei N. Semena and Raphael Skalidis and Paolo Soffitta and Allyn F. Tennant and Phillipp Thalhammer and Francesco Tombesi and Martin. C. Weisskopf and Joern Wilms and Sixuan Zhang and Iv{\'a}n Agudo and Lucio Angelo Antonelli and Matteo Bachetti and Luca Baldini and Wayne H. Baumgartner and Ronaldo Bellazzini and Stephen D. Bongiorno and Raffaella Bonino and Alessandro Brez and Niccolo’ Bucciantini and Simone Castellano and Elisabetta Cavazzuti and Stefano Ciprini and Enrico Costa and Alessandra De Rosa and Ettore Del Monte and Laura Di Gesu and Alessandro Di Marco and Immacolata Donnarumma and Victor Doroshenko and Steven R. Ehlert and Teruaki Enoto and Yuri Evangelista and Riccardo Ferrazzoli and Shuichi Gunji and Kiyoshi Hayashida and Jeremy S. Heyl and Wataru B. Iwakiri and Svetlana G. Jorstad and Vladim{\'i}r Karas and Jeffery J. Kolodziejczak and Fabio La Monaca and Ioannis Liodakis and Simone Maldera and Alberto Manfreda and Alan P. Marscher and Herman L. Marshall and Ikuyuki Mitsuishi and C-Y. Ng and Stephen L. O’Dell and Chiara Oppedisano and Alessandro Papitto and George G. Pavlov and Abel L. Peirson and Matteo Perri and Melissa Pesce-Rollins and Maura Pilia and Andrea Possenti and Simonetta Puccetti and Brian D. Ramsey and Roger W. Romani and Carmelo Sgro’ and Patrick O. Slane and Gloria Spandre and Toru Tamagawa and Fabrizio Tavecchio and Roberto Taverna and Yuzuru Tawara and Nicholas E. Thomas and Alessio Trois and Sergey S. Tsygankov and Roberto Turolla and Jacco Vink and Kinwah Wu and Fei Xie and Silvia Zane},
  pages={650 - 654}
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… 
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