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

Journal
Date Issued
2023
Author(s)
Veledina, Alexandra
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Dovčiak, Michal
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Poutanen, Juri
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Tennant, Allyn F.
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Negro, Michela
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Kaaret, Philip
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Roberts, Oliver J.
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Romani, Roger W.
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Sgrò, Carmelo
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Slane, Patrick
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Spandre, Gloria
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Swartz, Douglas A.
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Tamagawa, Toru
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Taverna, Roberto
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Tawara, Yuzuru
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Thomas, Nicholas E.
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Turolla, Roberto
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Vink, Jacco
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Wu, Kinwah
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Ingram, Adam
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Svoboda, Jiří
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Krawczynski, Henric
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Bianchi, Stefano
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Steiner, James F.
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García, Javier A.
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Kravtsov, Vadim
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Nitindala, Anagha P.
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Ewing, Melissa
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Marinucci, Andrea
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Tsygankov, Sergey S.
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Yang, Yi-Jung
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Weisskopf, Martin C.
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Trushkin, Sergei A.
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Nathan, Edward
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Petrucci, Pierre-Olivier
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Podgorný, Jakub
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Tugliani, Stefano
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Zane, Silvia
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Zhang, Wenda
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Agudo, Iván
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Baldini, Luca
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Baumgartner, Wayne H.
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Bellazzini, Ronaldo
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Bongiorno, Stephen D.
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Bonino, Raffaella
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Brez, Alessandro
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Castellano, Simone
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Cavazzuti, Elisabetta
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Chen, Chien-Ting
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Ciprini, Stefano
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Di Gesu, Laura
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Di Lalla, Niccolò
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Donnarumma, Immacolata
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Doroshenko, Victor
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Ehlert, Steven R.
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Enoto, Teruaki
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Gunji, Shuichi
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Hayashida, Kiyoshi
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Heyl, Jeremy
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Iwakiri, Wataru
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Jorstad, Svetlana G.
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Karas, Vladimir
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Kislat, Fabian
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Kitaguchi, Takao
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Kolodziejczak, Jeffery J.
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Latronico, Luca
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Liodakis, Ioannis
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Maldera, Simone
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Manfreda, Alberto
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Marin, Frédéric
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Marscher, Alan P.
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Marshall, Herman L.
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Mitsuishi, Ikuyuki
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Mizuno, Tsunefumi
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Ng, Chi-Yung
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O'Dell, Stephen L.
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Omodei, Nicola
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Oppedisano, Chiara
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Pavlov, George G.
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Peirson, Abel L.
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Pesce-Rollins, Melissa
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Puccetti, Simonetta
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Ramsey, Brian D.
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DOI
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 (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.
Volume
958
Issue
1
Start page
L16
Uri
Url
Issn Identifier
2041-8205
Ads BibCode
2023ApJ...958L..16V
Rights
open.access
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