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arxiv: 2309.15928 · v1 · pith:I4TFIXFXnew · submitted 2023-09-27 · 🌌 astro-ph.HE · astro-ph.SR

Discovery of X-ray Polarization from the Black Hole Transient Swift J1727.8-1613

Alexandra Veledina , Fabio Muleri , Michal Dovciak , Juri Poutanen , Ajay Ratheesh , Fiamma Capitanio , Giorgio Matt , Paolo Soffitta
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Allyn F. Tennant Michela Negro Philip Kaaret Enrico Costa Adam Ingram Jiri Svoboda Henric Krawczynski Stefano Bianchi James F. Steiner Javier A. Garcia Vadim Kravtsov Anagha P. Nitindala Melissa Ewing Guglielmo Mastroserio Andrea Marinucci Francesco Ursini Francesco Tombesi Sergey S. Tsygankov Yi-Jung Yang Martin C. Weisskopf Sergei A. Trushkin Elise Egron Maria Noemi Iacolina Maura Pilia Lorenzo Marra Romana Mikusincova Edward Nathan Maxime Parra Pierre-Olivier Petrucci Jakub Podgorny Stefano Tugliani Silvia Zane Wenda Zhang Ivan Agudo Lucio A. Antonelli Matteo Bachetti Luca Baldini Wayne H. Baumgartner Ronaldo Bellazzini Stephen D. Bongiorno Raffaella Bonino Alessandro Brez Niccolo Bucciantini Simone Castellano Elisabetta Cavazzuti Chien-Ting Chen Stefano Ciprini Alessandra De Rosa Ettore Del Monte Laura Di Gesu Niccolo Di Lalla Alessandro Di Marco Immacolata Donnarumma Victor Doroshenko Steven R. Ehlert Teruaki Enoto Yuri Evangelista Sergio Fabiani Riccardo Ferrazzoli Shuichi Gunji Kiyoshi Hayashida Jeremy Heyl Wataru Iwakiri Svetlana G. Jorstad Vladimir Karas Fabian Kislat Takao Kitaguchi Jeffery J. Kolodziejczak Fabio La Monaca Luca Latronico Ioannis Liodakis Simone Maldera Alberto Manfreda Frederic Marin Alan P. Marscher Herman L. Marshall Francesco Massaro Ikuyuki Mitsuishi Tsunefumi Mizuno Chi-Yung Ng Stephen L. O'Dell Nicola Omodei Chiara Oppedisano Alessandro Papitto George G. Pavlov Abel L. Peirson Matteo Perri Melissa Pesce-Rollins Andrea Possenti Simonetta Puccetti Brian D. Ramsey John Rankin Oliver J. Roberts Roger W. Romani Carmelo Sgro Patrick Slane Gloria Spandre Douglas A. Swartz Toru Tamagawa Fabrizio Tavecchio Roberto Taverna Yuzuru Tawara Nicholas E. Thomas Alessio Trois Roberto Turolla Jacco Vink Kinwah Wu Fei Xie
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classification 🌌 astro-ph.HE astro-ph.SR
keywords polarizationx-rayanglebrightcoronadetectiondiscoveryelongated
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We report the first detection of the X-ray polarization of the bright transient Swift J1727.8-1613 with the Imaging X-ray Polarimetry Explorer. The observation was performed at the beginning of the 2023 discovery outburst, when the source resided in the bright hard state. We find a time- and energy-averaged polarization degree of 4.1%+/-0.2% and a polarization angle of 2.2+/-1.3 degrees (errors at 68% confidence level; this translates to about 20-sigma significance of the polarization detection). This finding suggests that the hot corona emitting the bulk of the detected X-rays is elongated, rather than spherical. The X-ray polarization angle is consistent with that found in sub-mm wavelengths. Since the sub-mm polarization was found to be aligned with the jet direction in other X-ray binaries, this indicates that the corona is elongated orthogonal to the jet.

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