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Unveiling blazar synchrotron emission: a multiwavelength polarimetric study of high-synchrotron and low-synchrotron peaked populations

The polarimetric properties of blazars enable us to place constraints on the acceleration mechanisms that fuel their powerful jets. By studying the multiwavelength polarimetric behaviour of high-synchrotron peaked (HSP) and low-synchrotron peaked (LSP) blazars, we aim to explore differences in their...

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Main Authors: Capecchiacci, Sara (Author) , Liodakis, Ioannis (Author) , Middei, Riccardo (Author) , Kim, Dawoon E. (Author) , Gesu, Laura Di (Author) , Agudo, Iván (Author) , Agís-González, Beatriz (Author) , Arbet-Engels, Axel (Author) , Blinov, Dmitry (Author) , Chen, Chien-Ting (Author) , Ehlert, Steven R. (Author) , Gau, Ephraim (Author) , Heckmann, Lea (Author) , Hu, Kun (Author) , Jorstad, Svetlana G. (Author) , Kaaret, Philip (Author) , Kouch, Pouya M. (Author) , Krawczynski, Henric (Author) , Lindfors, Elina (Author) , Marin, Frédéric (Author) , Marscher, Alan P. (Author) , Myserlis, Ioannis (Author) , O’Dell, Stephen L. (Author) , Pacciani, Luigi (Author) , Paneque, David (Author) , Perri, Matteo (Author) , Puccetti, Simonetta (Author) , Saade, M. Lynne (Author) , Tavecchio, Fabrizio (Author) , Tennant, Allyn F. (Author) , Traianou, Efthalia (Author) , Weisskopf, Martin C. (Author) , Wu, Kinwah (Author) , Aceituno, Francisco José (Author) , Bonnoli, Giacomo (Author) , Casanova, Víctor (Author) , Emery, Gabriel (Author) , Escudero, Juan (Author) , Morcuende, Daniel (Author) , Otero-Santos, Jorge (Author) , Sota, Alfredo (Author) , Piirola, Vilppu (Author) , Borman, George A. (Author) , Kopatskaya, Evgenia N. (Author) , Larionova, Elena G. (Author) , Morozova, Daria A. (Author) , Shishkina, Ekaterina V. (Author) , Savchenko, Sergey S. (Author) , Vasilyev, Andrey A. (Author) , Grishina, Tatiana S. (Author) , Troitskiy, Ivan S. (Author) , Zhovtan, Alexey V. (Author) , McCall, Callum (Author) , Jermak, Helen E. (Author) , Steele, Iain A. (Author) , Bachev, Rumen (Author) , Strigachev, Anton (Author) , Imazawa, Ryo (Author) , Sasada, Mahito (Author) , Fukazawa, Yasushi (Author) , Kawabata, Koji S. (Author) , Uemura, Makoto (Author) , Mizuno, Tsunefumi (Author) , Nakaoka, Tatsuya (Author) , Tochihara, Sumie (Author) , Akai, Takahiro (Author) , Akitaya, Hiroshi (Author) , Berdyugin, Andrei V. (Author) , Kagitani, Masato (Author) , Kravtsov, Vadim (Author) , Poutanen, Juri (Author) , Sakanoi, Takeshi (Author) , Álvarez-Ortega, Diego (Author) , Casadio, Carolina (Author) , Kang, Sincheol (Author) , Lee, Sang-Sung (Author) , Kim, Sanghyun (Author) , Cheong, Whee Yeon (Author) , Jeong, Hyeon-Woo (Author) , Song, Chanwoo (Author) , Li, Shan (Author) , Nam, Myeong-Seok (Author) , Gurwell, Mark (Author) , Keating, Garrett (Author) , Rao, Ramprasad (Author) , Angelakis, Emmanouil (Author) , Kraus, Alexander (Author) , Benke, Petra (Author) , Debbrecht, Lena (Author) , Eich, Julia (Author) , Eppel, Florian (Author) , Gokus, Andrea (Author) , Hämmerich, Steven (Author) , Heßdörfer, Jonas (Author) , Kadler, Matthias (Author) , Kirchner, Dana (Author) , Paraschos, Georgios Filippos (Author) , Rösch, Florian (Author) , Schulga, Wladislaw (Author)
Format: Article (Journal)
Language:English
Published: November 2025
In: Astronomy and astrophysics
Year: 2025, Volume: 703, Pages: 1-11
ISSN:1432-0746
DOI:10.1051/0004-6361/202555392
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1051/0004-6361/202555392
Verlag, kostenfrei, Volltext: https://www.aanda.org/articles/aa/abs/2025/11/aa55392-25/aa55392-25.html
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Author Notes:Sara Capecchiacci, Ioannis Liodakis, Riccardo Middei, Dawoon E. Kim, Laura Di Gesu, Iván Agudo, Beatriz Agís-González, Axel Arbet-Engels, Dmitry Blinov, Chien-Ting Chen, Steven R. Ehlert, Ephraim Gau, Lea Heckmann, Kun Hu, Svetlana G. Jorstad, Philip Kaaret, Pouya M. Kouch, Henric Krawczynski, Elina Lindfors, Frédéric Marin, Alan P. Marscher, Ioannis Myserlis, Stephen L. O’Dell, Luigi Pacciani, David Paneque, Matteo Perri, Simonetta Puccetti, M. Lynne Saade, Fabrizio Tavecchio, Allyn F. Tennant, Efthalia Traianou, Martin C. Weisskopf, Kinwah Wu, Francisco José Aceituno, Giacomo Bonnoli, Víctor Casanova, Gabriel Emery, Juan Escudero, Daniel Morcuende, Jorge Otero-Santos, Alfredo Sota, Vilppu Piirola, George A. Borman, Evgenia N. Kopatskaya, Elena G. Larionova, Daria A. Morozova, Ekaterina V. Shishkina, Sergey S. Savchenko, Andrey A. Vasilyev, Tatiana S. Grishina, Ivan S. Troitskiy, Alexey V. Zhovtan, Callum McCall, Helen E. Jermak, Iain A. Steele, Rumen Bachev, Anton Strigachev, Ryo Imazawa, Mahito Sasada, Yasushi Fukazawa, Koji S. Kawabata, Makoto Uemura, Tsunefumi Mizuno, Tatsuya Nakaoka, Sumie Tochihara, Takahiro Akai, Hiroshi Akitaya, Andrei V. Berdyugin, Masato Kagitani, Vadim Kravtsov, Juri Poutanen, Takeshi Sakanoi, Diego Álvarez-Ortega, Carolina Casadio, Sincheol Kang, Sang-Sung Lee, Sanghyun Kim, Whee Yeon Cheong, Hyeon-Woo Jeong, Chanwoo Song, Shan Li, Myeong-Seok Nam, Mark Gurwell, Garrett Keating, Ramprasad Rao, Emmanouil Angelakis, Alexander Kraus, Petra Benke, Lena Debbrecht, Julia Eich, Florian Eppel, Andrea Gokus, Steven Hämmerich, Jonas Heßdörfer, Matthias Kadler, Dana Kirchner, Georgios Filippos Paraschos, Florian Rösch, Wladislaw Schulga
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Summary:The polarimetric properties of blazars enable us to place constraints on the acceleration mechanisms that fuel their powerful jets. By studying the multiwavelength polarimetric behaviour of high-synchrotron peaked (HSP) and low-synchrotron peaked (LSP) blazars, we aim to explore differences in their emission mechanisms and magnetic field structure in the acceleration region. In this study, we take advantage of several X-ray polarisation observations of HSP by the IXPE, including four new observations of Mrk 501, along with optical polarisation observations of LSP from RoboPol and other instruments. We find that the polarisation degree (PD) distribution of HSP in X-rays is systematically higher than in optical and mm-radio wavelengths, as reported in previous IXPE publications. The distribution of the X-ray electric vector position angles (PA) is centred around the jet axis with most of the observations consistent with zero difference within uncertainties. In fact, the distribution of the offset of the PA from the jet axis is consistent between the LSP and HSP populations (with PA measured in optical for the first, X-ray for the latter), suggesting a common magnetic field structure close to the acceleration region. These results offer strong support for the emerging energy stratified scenario of particle acceleration followed by energy loss in blazar jets.
Item Description:Online veröffentlicht: 04. November 2025
Gesehen am 17.04.2026
Physical Description:Online Resource
ISSN:1432-0746
DOI:10.1051/0004-6361/202555392

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