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arxiv: 2311.05497 · v3 · pith:BZD4A6KMnew · submitted 2023-11-09 · 🌌 astro-ph.HE

Tracking the X-ray Polarization of the Black Hole Transient Swift J1727.8-1613 during a State Transition

Adam Ingram , Niek Bollemeijer , Alexandra Veledina , Michal Dovciak , Juri Poutanen , Elise Egron , Thomas D. Russell , Sergei A. Trushkin
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Michela Negro Ajay Ratheesh Fiamma Capitanio Riley Connors Joseph Neilsen Alexander Kraus Maria Noemi Iacolina Alberto Pellizzoni Maura Pilia Francesco Carotenuto Giorgio Matt Guglielmo Mastroserio Philip Kaaret Stefano Bianchi Javier A. Garcia Matteo Bachetti Kinwah Wu Enrico Costa Melissa Ewing Vadim Kravtsov Henric Krawczynski Vladislav Loktev Andrea Marinucci Lorenzo Marra Romana Mikusincova Edward Nathan Maxime Parra Pierre-Olivier Petrucci Simona Righini Paolo Soffitta James F. Steiner Jiri Svoboda Francesco Tombesi Stefano Tugliani Francesco Ursini Yi-Jung Yang Silvia Zane Wenda Zhang Ivan Agudo Lucio A. Antonelli 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 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 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 Allyn F. Tennant Nicholas E. Thomas Alessio Trois Sergey S. Tsygankov Roberto Turolla Jacco Vink Martin C. Weisskopf Fei Xie
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keywords polarizationx-rayobservationsstateblackholej1727soft
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We report on an observational campaign on the bright black hole X-ray binary Swift J1727.8$-$1613 centered around five observations by the Imaging X-ray Polarimetry Explorer (IXPE). These observations track for the first time the evolution of the X-ray polarization of a black hole X-ray binary across a hard to soft state transition. The 2--8 keV polarization degree decreased from $\sim$4\% to $\sim$3\% across the five observations, but the polarization angle remained oriented in the North-South direction throughout. Based on observations with the Australia Telescope Compact Array (ATCA), we find that the intrinsic 7.25 GHz radio polarization aligns with the X-ray polarization. Assuming the radio polarization aligns with the jet direction (which can be tested in the future with higher spatial resolution images of the jet), our results imply that the X-ray corona is extended in the disk plane, rather than along the jet axis, for the entire hard intermediate state. This in turn implies that the long ($\gtrsim$10 ms) soft lags that we measure with the Neutron star Interior Composition ExploreR (NICER) are dominated by processes other than pure light-crossing delays. Moreover, we find that the evolution of the soft lag amplitude with spectral state does not follow the trend seen for other sources, implying that Swift J1727.8$-$1613 is a member of a hitherto under-sampled sub-population.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Bridging X-ray Polarization with Timing & Spectroscopic Parameters of a galactic black hole: Swift J1727.8-1613

    astro-ph.HE 2026-05 unverdicted novelty 5.0

    Discovery of Spearman correlation 0.8 between energy-dependent time lag and polarization degree in Swift J1727.8-1613, with theoretical arguments for additional mechanisms beyond inverse Comptonization.