X-ray Polarization of the Black Hole X-ray Binary 4U 1630-47 Challenges Standard Thin Accretion Disk Scenario
Creators: name: Ratheesh, Ajay
name: Dovčiak, Michal
name: Krawczynski, Henric
name: Podgorný, Jakub
name: Marra, Lorenzo
name: Veledina, Alexandra
name: Suleimanov, Valery
name: Cavero, Nicole Rodriguez
name: Steiner, James
name: Svoboda, Jiri
name: Marinucci, Andrea
name: Bianchi, Stefano
name: Negro, Michela
name: Matt, Giorgio
name: Tombesi, Francesco
name: Poutanen, Juri
name: Ingram, Adam
name: Taverna, Roberto
name: West, Andrew
name: Karas, Vladimir
name: Ursini, Francesco
name: Soffitta, Paolo
name: Capitanio, Fiamma
name: Viscolo, Domenico
name: Manfreda, Alberto
name: Muleri, Fabio
name: Parra, Maxime
name: Beheshtipour, Banafsheh
name: Chun, Sohee
name: Cibrario, Niccolò
name: Di Lalla, Niccolò
name: Fabiani, Sergio
name: Hu, Kun
name: Kaaret, Philip
name: Loktev, Vladislav
name: Mikušincová, Romana
name: Mizuno, Tsunefumi
name: Omodei, Nicola
name: Petrucci, Pierre-Olivier
name: Puccetti, Simonetta
name: Rankin, John
name: Zane, Silvia
name: Zhang, Sixuan
name: Agudo, Iván
name: Antonelli, Lucio
name: Bachetti, Matteo
name: Baldini, Luca
name: Baumgartner, Wayne
name: Bellazzini, Ronaldo
name: Bongiorno, Stephen
name: Bonino, Raffaella
name: Brez, Alessandro
name: Bucciantini, Niccolò
name: Castellano, Simone
name: Cavazzuti, Elisabetta
name: Chen, Chien-Ting
name: Ciprini, Stefano
name: Costa, Enrico
name: De Rosa, Alessandra
name: Del Monte, Ettore
name: Di Gesu, Laura
name: Di Marco, Alessandro
name: Donnarumma, Immacolata
name: Doroshenko, Victor
name: Ehlert, Steven
name: Enoto, Teruaki
name: Evangelista, Yuri
name: Ferrazzoli, Riccardo
name: Garcia, Javier
name: Gunji, Shuichi
name: Hayashida, Kiyoshi
name: Heyl, Jeremy
name: Iwakiri, Wataru
name: Jorstad, Svetlana
name: Kislat, Fabian
name: Kitaguchi, Takao
name: Kolodziejczak, Jeffery
name: La Monaca, Fabio
name: Latronico, Luca
name: Liodakis, Ioannis
name: Maldera, Simone
name: Marin, Frédéric
name: Marscher, Alan
name: Marshall, Herman
name: Massaro, Francesco
name: Mitsuishi, Ikuyuki
name: Ng, C. -Y.
name: O'Dell, Stephen
name: Oppedisano, Chiara
name: Papitto, Alessandro
name: Pavlov, George
name: Peirson, Abel
name: Perri, Matteo
name: Pesce-Rollins, Melissa
name: Pilia, Maura
name: Possenti, Andrea
name: Ramsey, Brian
name: Roberts, Oliver
name: Romani, Roger
name: Sgrò, Carmelo
name: Slane, Patrick
name: Spandre, Gloria
name: Swartz, Douglas
name: Tamagawa, Toru
name: Tavecchio, Fabrizio
name: Tawara, Yuzuru
name: Tennant, Allyn
name: Thomas, Nicholas
name: Trois, Alessio
name: Tsygankov, Sergey
name: Turolla, Roberto
name: Vink, Jacco
name: Weisskopf, Martin
name: Wu, Kinwah
name: Xie, Fei
Publisher: name: arXiv
Year: 2023
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: Large energy-dependent X-ray polarization degree is detected by the Imaging X-ray Polarimetry Explorer ({IXPE}) in the high-soft emission state of the black hole X-ray binary 4U 1630--47. The highly significant detection (at $\approx50σ$ confidence level) of an unexpectedly high polarization, rising from $\sim6\%$ at $2$ keV to $\sim10\%$ at $8$ keV, cannot be easily reconciled with standard models of thin accretion discs. In this work we compare the predictions of different theoretical models with the {IXPE} data and conclude that the observed polarization properties are compatible with a scenario in which matter accretes onto the black hole through a thin disc, covered by a partially-ionized atmosphere flowing away at mildly relativistic velocities.
description: Published in ApJ (https://doi.org/10.3847/1538-4357/ad226e)