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arxiv: 2508.14168 · v1 · pith:LCXHI2WVnew · submitted 2025-08-19 · 🌌 astro-ph.HE

Unveiling blazar synchrotron emission: a multiwavelength polarimetric study of HSP and LSP populations

Sara Capecchiacci , Ioannis Liodakis , Riccardo Middei , Dawoon E. Kim , Laura Di Gesu , Ivan Agudo , Beatriz Agis-Gonzalez , Axel Arbet-Engels
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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 Frederic 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 Jose Aceituno Giacomo Bonnoli Victor 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 Alvarez-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 Hammerich Jonas Hessdorfer Matthias Kadler Dana Kirchner Georgios Filippos Paraschos Florian Rosch Wladislaw Schulga
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classification 🌌 astro-ph.HE
keywords accelerationobservationsdistributionopticalpolarimetricpolarisationsynchrotronx-ray
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Polarimetric properties of blazars allow us to put 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, and optical polarisation observations of LSP from RoboPol and many others. 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 centered 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, in strong support of the emerging energy stratified picture of particle acceleration followed by energy loss in blazar jets.

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