학술논문
Discovery of X-ray Polarization from the Black Hole Transient Swift J1727.8-1613
Document Type
Working Paper
Author
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
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Subject
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Abstract
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.
Comment: 10 pages, 3 figures, submitted
Comment: 10 pages, 3 figures, submitted