A1 Refereed original research article in a scientific journal
Discovery of X-Ray Polarization from the Black Hole Transient Swift J1727.8-1613
Authors: Veledina Alexandra, Muleri Fabio, Dovciak Michal, Poutanen Juri, Ratheesh Ajay, Capitanio Fiamma, Matt Giorgio, Soffitta Paolo, Tennant Allyn F., Negro Michela, Kaaret Philip, Costa Enrico, Ingram Adam, Svoboda Jiri, Krawczynski Henric, Bianchi Stefano, Steiner James F., Garcia Javier A., Kravtsov Vadim, Nitindala Anagha P., Ewing Melissa, Mastroserio Guglielmo, Marinucci Andrea, Ursini Francesco, Tombesi Francesco, Tsygankov Sergey S., Yang Yi-Jung, Weisskopf Martin C., Trushkin Sergei A., Egron Elise, Iacolina Maria Noemi, Pilia Maura, Marra Lorenzo, Mikusincova Romana, Nathan Edward, Parra Maxime, Petrucci Pierre-Olivier, Podgorny Jakub, Tugliani Stefano, Zane Silvia, Zhang Wenda, Agudo Ivan, Antonelli Lucio A., Bachetti Matteo, Baldini Luca, Baumgartner Wayne H., Bellazzini Ronaldo, Bongiorno Stephen D., Bonino Raffaella, Brez Alessandro, Bucciantini Niccolo, Castellano Simone, Cavazzuti Elisabetta, Chen Chien-Ting, Ciprini Stefano, De Rosa Alessandra, Del Monte Ettore, Di Gesu Laura, Di Lalla Niccolo, Di Marco Alessandro, Donnarumma Immacolata, Doroshenko Victor, Ehlert Steven R., Enoto Teruaki, Evangelista Yuri, Fabiani Sergio, Ferrazzoli Riccardo, Gunji Shuichi, Hayashida Kiyoshi, Heyl Jeremy, Iwakiri Wataru, Jorstad Svetlana G., Karas Vladimir, Kislat Fabian, Kitaguchi Takao, Kolodziejczak Jeffery J., La Monaca Fabio, Latronico Luca, Liodakis Ioannis, Maldera Simone, Manfreda Alberto, Marin Frederic, Marscher Alan P., Marshall Herman L., Massaro Francesco, Mitsuishi Ikuyuki, Mizuno Tsunefumi, Ng Chi-Yung, O'Dell Stephen L., Omodei Nicola, Oppedisano Chiara, Papitto Alessandro, Pavlov George G., Peirson Abel L., Perri Matteo, Pesce-Rollins Melissa, Possenti Andrea, Puccetti Simonetta, Ramsey Brian D., Rankin John, Roberts Oliver J., Romani Roger W., Sgro Carmelo, Slane Patrick, Spandre Gloria, Swartz Douglas A., Tamagawa Toru, Tavecchio Fabrizio, Taverna Roberto, Tawara Yuzuru, Thomas Nicholas E., Trois Alessio, Turolla Roberto, Vink Jacco, Wu Kinwah, Xie Fei
Publisher: Institute of Physics Publishing
Publication year: 2023
Journal: Astrophysical Journal Letters
Journal name in source: ASTROPHYSICAL JOURNAL LETTERS
Article number: L16
Volume: 958
Issue: 1
ISSN: 2041-8205
eISSN: 2041-8213
DOI: https://doi.org/10.3847/2041-8213/ad0781
Web address : https://iopscience.iop.org/article/10.3847/2041-8213/ad0781
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/182317474
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 ± 13 (errors at 68% confidence level; this translates to ∼20σ 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 submillimeter wavelengths. Since the submillimeter 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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