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arxiv: 2303.12034 · v3 · pith:CNL222QKnew · submitted 2023-03-21 · 🌌 astro-ph.HE

The first X-ray polarimetric observation of the black hole binary LMC X-1

Jakub Podgorny , Lorenzo Marra , Fabio Muleri , Nicole Rodriguez Cavero , Ajay Ratheesh , Michal Dovciak , Romana Mikusincova , Maimouna Brigitte
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James F. Steiner Alexandra Veledina Stefano Bianchi Henric Krawczynski Jiri Svoboda Philip Kaaret Giorgio Matt Javier A. Garcia Pierre-Olivier Petrucci Alexander A. Lutovinov Andrey N. Semena Alessandro Di Marco Michela Negro Martin C. Weisskopf Adam Ingram Juri Poutanen Banfsheh Beheshtipour Sohee Chun Kun Hu Tsunefumi Mizuno Zhang Sixuan Francesco Tombesi Silvia Zane 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 Enrico Costa Alessandra De Rosa Ettore Del Monte Laura Di Gesu Niccolo Di Lalla 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 Andrea Marinucci Alan P. Marscher Herman L. Marshall Francesco Massaro Ikuyuki Mitsuishi Chi-Yung Ng Stephen L. O'Dell Nicola Omodei Chiara Oppedisano Alessandro Papitto George G. Pavlov Abel L. Peirson Matteo Perri Melissa Pesce-Rollins Maura Pilia Andrea Possenti Simonetta Puccetti Brian D. Ramsey John Rankin Oliver J. Roberts Roger W. Romani Carmelo Sgro Patrick Slane Paolo Soffitta Gloria Spandre Doug 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 Kinwah Wu Fei Xie
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keywords polarizationcentx-raydiscemissionassumedbinarycomponent
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We report on an X-ray polarimetric observation of the high-mass X-ray binary LMC X-1 in the high/soft state, obtained by the Imaging X-ray Polarimetry Explorer (IXPE) in October 2022. The measured polarization is below the minimum detectable polarization of 1.1 per cent (at the 99 per cent confidence level). Simultaneously, the source was observed with the NICER, NuSTAR and SRG/ART-XC instruments, which enabled spectral decomposition into a dominant thermal component and a Comptonized one. The low 2-8 keV polarization of the source did not allow for strong constraints on the black-hole spin and inclination of the accretion disc. However, if the orbital inclination of about 36 degrees is assumed, then the upper limit is consistent with predictions for pure thermal emission from geometrically thin and optically thick discs. Assuming the polarization degree of the Comptonization component to be 0, 4, or 10 per cent, and oriented perpendicular to the polarization of the disc emission (in turn assumed to be perpendicular to the large scale ionization cone orientation detected in the optical band), an upper limit to the polarization of the disc emission of 1.0, 0.9 or 0.9 per cent, respectively, is found (at the 99 per cent confidence level).

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Cited by 1 Pith paper

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  1. Polarization Signatures from GRMHD Simulations of Black Hole Accretion

    astro-ph.HE 2026-05 unverdicted novelty 2.0

    Polarization signatures from GRMHD simulations of black hole accretion can help probe disk, corona, and jet properties when combined with X-ray polarimetry observations.