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arxiv: 2311.16313 · v1 · pith:L3TLIARNnew · submitted 2023-11-27 · 🌌 astro-ph.HE

X-ray Polarization of the Eastern Lobe of SS 433

Philip Kaaret , Riccardo Ferrazzoli , Stefano Silvestri , Michela Negro , Alberto Manfreda , Kinwah Wu , Enrico Costa , Paolo Soffitta
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Samar Safi-Harb Juri Poutanen Alexandra Veledina Alessandro Di Marco Patrick Slane Stefano Bianchi Adam Ingram Roger W. Romani Nicolo Cibrario Brydyn Mac Intyre Romana Mikusincova Ajay Ratheesh James F. Steiner Jiri Svoboda Stefano Tugliani Ivan Agudo Lucio A. Antonelli Matteo Bachetti Luca Baldini Wayne H. Baumgartner Ronaldo Bellazzini Stephen D. Bongiorno Raffaella Bonino Alessandro Brez Niccolo Bucciantini Fiamma Capitanio Simone Castellano Elisabetta Cavazzuti Chien-Ting Chen Stefano Ciprini Alessandra De Rosa Ettore Del Monte Laura Di Gesu Niccolo Di Lalla Immacolata Donnarumma Victor Doroshenko Michal Dovciak Steven R. Ehlert Teruaki Enoto Yuri Evangelista Sergio Fabiani Javier A. Garcia Shuichi Gunji Kiyoshi Hayashida Jeremy Heyl Wataru Iwakiri Svetlana G. Jorstad Vladimir Karas Fabian Kislat Takao Kitaguchi Jeffery J. Kolodziejczak Henric Krawczynski Fabio La Monaca Luca Latronico Ioannis Liodakis Simone Maldera Frederic Marin Andrea Marinucci Alan P. Marscher Herman L. Marshall Francesco Massaro Giorgio Matt Ikuyuki Mitsuishi Tsunefumi Mizuno Fabio Muleri Chi-Yung Ng Stephen L. O'Dell Nicola Omodei Chiara Oppedisano Alessandro Papitto George G. Pavlov Abel L. Peirson Matteo Perri Melissa Pesce-Rollins Pierre-Olivier Petrucci Maura Pilia Andrea Possenti Simonetta Puccetti Brian D. Ramsey John Rankin Oliver J. Roberts Carmelo Sgro Gloria Spandre Douglas A. Swartz Toru Tamagawa Fabrizio Tavecchio Roberto Taverna Yuzuru Tawara Allyn F. Tennant Nicholas E. Thomas Francesco Tombesi Alessio Trois Sergey S. Tsygankov Roberto Turolla Jacco Vink Martin C. Weisskopf Fei Xie Silvia Zane
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classification 🌌 astro-ph.HE
keywords polarizationmagneticx-rayaccelerationbulkdegreeeasternemission
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How astrophysical systems translate the kinetic energy of bulk motion into the acceleration of particles to very high energies is a pressing question. SS 433 is a microquasar that emits TeV gamma-rays indicating the presence of high-energy particles. A region of hard X-ray emission in the eastern lobe of SS 433 was recently identified as an acceleration site. We observed this region with the Imaging X-ray Polarimetry Explorer and measured a polarization degree in the range 38% to 77%. The high polarization degree indicates the magnetic field has a well ordered component if the X-rays are due to synchrotron emission. The polarization angle is in the range -12 to +10 degrees (east of north) which indicates that the magnetic field is parallel to the jet. Magnetic fields parallel to the bulk flow have also been found in supernova remnants and the jets of powerful radio galaxies. This may be caused by interaction of the flow with the ambient medium.

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