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arxiv: 2211.13764 · v1 · pith:NN4YUFZFnew · submitted 2022-11-24 · 🌌 astro-ph.HE · astro-ph.GA

X-ray Polarization Observations of BL Lacertae

Riccardo Middei , Ioannis Liodakis , Matteo Perri , Simonetta Puccetti , Elisabetta Cavazzuti , Laura Di Gesu , Steven R. Ehlert , Grzegorz Madejski
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Alan P. Marscher Herman L. Marshall Fabio Muleri Michela Negro Svetlana G. Jorstad Beatriz Ag\'is-Gonz\'alez Iv\'an Agudo Giacomo Bonnoli Maria I. Bernardos V\'ictor Casanova Maya Garc\'ia-Comas C\'esar Husillos Alessandro Marchini Alfredo Sota Pouya M. Kouch George A. Borman Evgenia N. Kopatskaya Elena G. Larionova Daria A. Morozova Sergey S. Savchenko Andrey A. Vasilyev Alexey V. Zhovtan Carolina Casadio Juan Escudero Ioannis Myserlis Antonio Hales Seiji Kameno Ruediger Kneissl Hugo Messias Hiroshi Nagai Dmitry Blinov Ioakeim G. Bourbah Sebastian Kiehlmann Evangelos Kontopodis Nikos Mandarakas Stylianos Romanopoulos Raphael Skalidis Anna Vervelaki Joseph R. Masiero Dimitri Mawet Maxwell A. Millar-Blanchaer Georgia V. Panopoulou Samaporn Tinyanont Andrei V. Berdyugin Masato Kagitani Vadim Kravtsov Takeshi Sakanoi Ryo Imazawa Mahito Sasada Yasushi Fukazawa Koji S. Kawabata Makoto Uemura Tsunefumi Mizuno Tatsuya Nakaoka Hiroshi Akitaya Mark Gurwell Ramprasad Rao Niccol\'o Di Lalla Nicol\'o Cibrario Immacolata Donnarumma Dawoon E. Kim Nicola Omodei Luigi Pacciani Juri Poutanen Fabrizio Tavecchio Lucio A. Antonelli Matteo Bachetti Luca Baldini Wayne H. Baumgartner Ronaldo Bellazzini Stefano Bianchi Stephen D. Bongiorno Raffaella Bonino Alessandro Brez Niccol\'o Bucciantini Fiamma Capitanio Simone Castellano Stefano Ciprini Enrico Costa Alessandra De Rosa Ettore Del Monte Alessandro Di Marco Victor Doroshenko Michal Dov\v{c}iak Teruaki Enoto Yuri Evangelista Sergio Fabiani Riccardo Ferrazzoli Javier A. Garcia Shuichi Gunji Kiyoshi Hayashida Jeremy Heyl Wataru Iwakiri Vladimir Karas Takao Kitaguchi Jeffery J. Kolodziejczak Henric Krawczynski Fabio La Monaca Luca Latronico Simone Maldera Alberto Manfreda Fr\'ed\'eric Marin Andrea Marinucci Francesco Massaro Giorgio Matt Ikuyuki Mitsuishi C.-Y. Ng Stephen L. O'Dell Chiara Oppedisano Alessandro Papitto George G. Pavlov Abel L. Peirson Melissa Pesce-Rollins Pierre-Olivier Petrucci Maura Pilia Andrea Possenti Brian D. Ramsey John Rankin Ajay Ratheesh Roger W. Romani Carmelo Sgr\'o Patrick Slane Paolo Soffitta Gloria Spandre Toru Tamagawa Roberto Taverna Yuzuru Tawara Allyn F. Tennant Nicholas E. Thomas Francesco Tombesi Alessio Trois Sergey Tsygankov Roberto Turolla Jacco Vink Martin C. Weisskopf Kinwah Wu Fei Xie Silvia Zane
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classification 🌌 astro-ph.HE astro-ph.GA
keywords polarizationemissionx-rayoriginanalysisblazarsfrequencylacertae
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Blazars are a class of jet-dominated active galactic nuclei with a typical double-humped spectral energy distribution. It is of common consensus the Synchrotron emission to be responsible for the low frequency peak, while the origin of the high frequency hump is still debated. The analysis of X-rays and their polarization can provide a valuable tool to understand the physical mechanisms responsible for the origin of high-energy emission of blazars. We report the first observations of BL Lacertae performed with the Imaging X-ray Polarimetry Explorer ({IXPE}), from which an upper limit to the polarization degree $\Pi_X<$12.6\% was found in the 2-8 keV band. We contemporaneously measured the polarization in radio, infrared, and optical wavelengths. Our multiwavelength polarization analysis disfavors a significant contribution of proton synchrotron radiation to the X-ray emission at these epochs. Instead, it supports a leptonic origin for the X-ray emission in BL Lac.

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