IXPE and Multiwavelength Observations of Blazar PG 1553+113 Reveal an Orphan Optical Polarization Swing

Riccardo Middei, Matteo Perri, Simonetta Puccetti, Ioannis Liodakis, Laura Di Gesu, Alan P. Marscher, Nicole Rodriguez Cavero, Fabrizio Tavecchio, Immacolata Donnarumma, Herman L. Marshall, Víctor Casanova, Giacomo Bonnoli, Beatriz Agís-González, Carolina Casadio, Alfredo Sota, Ioannis Myserlis, Juan Escudero, Pouya M. Kouch, Albrecht Sievers, Mark Gurwell, Elina Lindfors, Ramprasad Rao, Garrett K. Keating, Sincheol Kang, Sang-Sung Lee, Whee Yeon Cheong, Sang-Hyun Kim, Hyeon-Woo Jeong, Luigi Pacciani, Dawoon E. Kim, Marco Laurenti, Francisco José Aceituno, Svetlana G. Jorstad, Iván Agudo, Emmanouil Angelakis, Alexander Kraus, Lucio A. Antonelli, Matteo Bachetti, Luca Baldini, Wayne H. Baumgartner, Ronaldo Bellazzini, Stefano Bianchi, Stephen D. Bongiorno, Raffaella Bonino, Alessandro Brez, Niccolò Bucciantini, Fiamma Capitanio, Elisabetta Cavazzuti, Chien-Ting Chen, Simone Castellano, Stefano Ciprini, Enrico Costa, Alessandra De Rosa, Ettore Del Monte, Niccolò Di Lalla, Michal Dovčiak, Victor Doroshenko, Alessandro Di Marco, Steven R. Ehlert, Teruaki Enoto, Sergio Fabiani, Yuri Evangelista, Riccardo Ferrazzoli, Takao Kitaguchi, Jeffery J. Kolodziejczak, Henric Krawczynski, Fabio La Monaca, Luca Latronico, Simone Maldera, Alberto Manfreda, Frédéric Marin, Andrea Marinucci, Javier A. García, Kiyoshi Hayashida, Shuichi Gunji, Wataru Iwakiri, Jeremy Heyl, Fabian Kislat, Vladimir Karas, Philip Kaaret, Francesco Massaro, Giorgio Matt, Ikuyuki Mitsuishi, Tsunefumi Mizuno, Fabio Muleri, Michela Negro, Chi-Yung Ng, Stephen L. O’Dell, Nicola Omodei, Alessandro Papitto, Chiara Oppedisano, Brian D. Ramsey, Juri Poutanen, Ajay Ratheesh, John Rankin, Oliver J. Roberts, Roger W. Romani, Carmelo Sgrò, Patrick Slane, Paolo Soffitta, Gloria Spandre, Abel L. Peirson, Pierre-Olivier Petrucci, Melissa Pesce-Rollins, Maura Pilia, Andrea Possenti, George G. Pavlov, Douglas A. Swartz, Toru Tamagawa, Roberto Taverna, Yuzuru Tawara, Allyn F. Tennant, Nicholas E. Thomas, Francesco Tombesi, Alessio Trois, Sergey S. Tsygankov, Jacco Vink, Roberto Turolla, Silvia Zane, Martin C. Weisskopf, Kinwah Wu, Fei Xie

doi:10.3847/2041-8213/acec3e

<jats:title>Abstract</jats:title> <jats:p>The lower-energy peak of the spectral energy distribution of blazars has commonly been ascribed to synchrotron radiation from relativistic particles in the jets. Despite the consensus regarding jet emission processes, the particle acceleration mechanism is still debated. Here, we present the first X-ray polarization observations of PG 1553+113, a high-synchrotron-peak blazar observed by the Imaging X-ray Polarimetry Explorer (IXPE). We detect an X-ray polarization degree of (10 ± 2)% along an electric-vector position angle of <jats:italic>ψ</jats:italic> <jats:sub>X</jats:sub> = 86° ± 8°. At the same time, the radio and optical polarization degrees are lower by a factor of ∼3. During our IXPE pointing, we observed the first orphan optical polarization swing of the IXPE era, as the optical angle of PG 1553+113 underwent a smooth monotonic rotation by about 125°, with a rate of ∼17° day<jats:sup>–1</jats:sup>. We do not find evidence of a similar rotation in either radio or X-rays, which suggests that the X-ray and optically emitting regions are separate or, at most, partially cospatial. Our spectropolarimetric results provide further evidence that the steady-state X-ray emission in blazars originates in a shock-accelerated and energy-stratified electron population.</jats:p>

IXPE and Multiwavelength Observations of Blazar PG 1553+113 Reveal an Orphan Optical Polarization Swing

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IXPE and Multiwavelength Observations of Blazar PG 1553+113 Reveal an Orphan Optical Polarization Swing

書誌事項

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収録刊行物

被引用文献 (7)*注記

参考文献 (87)*注記

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