The X-Ray Polarization View of Mrk 421 in an Average Flux State as Observed by the Imaging X-Ray Polarimetry Explorer - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical journal letters Year : 2022

The X-Ray Polarization View of Mrk 421 in an Average Flux State as Observed by the Imaging X-Ray Polarimetry Explorer

Laura Di Gesu , Immacolata Donnarumma , Fabrizio Tavecchio , Iván Agudo , Thibault Barnounin (1) , Nicolò Cibrario , Niccolò Di Lalla , Alessandro Di Marco , Juan Escudero , Manel Errando , Svetlana G. Jorstad , Dawoon E. Kim , Pouya M. Kouch , Ioannis Liodakis , Elina Lindfors , Grzegorz Madejski , Herman L. Marshall , Alan P. Marscher , Riccardo Middei , Fabio Muleri , Ioannis Myserlis , Michela Negro , Nicola Omodei , Luigi Pacciani , Alessandro Paggi , Matteo Perri , Simonetta Puccetti , 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 , Simone Castellano , Elisabetta Cavazzuti , Stefano Ciprini , Enrico Costa , Alessandra de Rosa , Ettore del Monte , Victor Doroshenko , Michal Dovčiak , Steven R. Ehlert , 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 , Frédéric Marin (1) , Andrea Marinucci , Francesco Massaro , Giorgio Matt , Ikuyuki Mitsuishi , Tsunefumi Mizuno , C. -Y. Ng , Stephen L. O'Dell , Chiara Oppedisano , Alessandro Papitto , George G. Pavlov , Abel L. Peirson , Melissa Pesce-Rollins , Pierre-Olivier Petrucci (2) , Maura Pilia , Andrea Possenti , Juri Poutanen , Brian D. Ramsey , John Rankin , Ajay Ratheesh , Roger W. Romani , Carmelo Sgrò , Patrick Slane , Paolo Soffitta , Gloria Spandre , Toru Tamagawa , Roberto Taverna , Yuzuru Tawara , Allyn F. Tennant , Nicolas E. Thomas , Francesco Tombesi , Alessio Trois , Sergey Tsygankov , Roberto Turolla , Jacco Vink , Martin C. Weisskopf , Kinwah Wu , Fei Xie , Silvia Zane
Laura Di Gesu
  • Function : Author
Immacolata Donnarumma
  • Function : Author
Fabrizio Tavecchio
  • Function : Author
Iván Agudo
  • Function : Author
Nicolò Cibrario
  • Function : Author
Niccolò Di Lalla
  • Function : Author
Alessandro Di Marco
  • Function : Author
Juan Escudero
  • Function : Author
Manel Errando
  • Function : Author
Svetlana G. Jorstad
  • Function : Author
Dawoon E. Kim
  • Function : Author
Pouya M. Kouch
  • Function : Author
Ioannis Liodakis
  • Function : Author
Elina Lindfors
  • Function : Author
Grzegorz Madejski
  • Function : Author
Herman L. Marshall
  • Function : Author
Alan P. Marscher
  • Function : Author
Riccardo Middei
  • Function : Author
Fabio Muleri
  • Function : Author
Ioannis Myserlis
  • Function : Author
Michela Negro
  • Function : Author
Nicola Omodei
  • Function : Author
Luigi Pacciani
  • Function : Author
Alessandro Paggi
  • Function : Author
Matteo Perri
  • Function : Author
Simonetta Puccetti
  • Function : Author
Lucio A. Antonelli
  • Function : Author
Matteo Bachetti
  • Function : Author
Luca Baldini
  • Function : Author
Wayne H. Baumgartner
  • Function : Author
Ronaldo Bellazzini
  • Function : Author
Stefano Bianchi
  • Function : Author
Stephen D. Bongiorno
  • Function : Author
Raffaella Bonino
  • Function : Author
Alessandro Brez
  • Function : Author
Niccolò Bucciantini
  • Function : Author
Fiamma Capitanio
  • Function : Author
Simone Castellano
  • Function : Author
Elisabetta Cavazzuti
  • Function : Author
Stefano Ciprini
  • Function : Author
Enrico Costa
  • Function : Author
Alessandra de Rosa
  • Function : Author
Ettore del Monte
  • Function : Author
Victor Doroshenko
  • Function : Author
Michal Dovčiak
  • Function : Author
Steven R. Ehlert
  • Function : Author
Teruaki Enoto
  • Function : Author
Yuri Evangelista
  • Function : Author
Sergio Fabiani
  • Function : Author
Riccardo Ferrazzoli
  • Function : Author
Javier A. Garcia
  • Function : Author
Shuichi Gunji
  • Function : Author
Kiyoshi Hayashida
  • Function : Author
Jeremy Heyl
  • Function : Author
Wataru Iwakiri
  • Function : Author
Vladimir Karas
  • Function : Author
Takao Kitaguchi
  • Function : Author
Jeffery J. Kolodziejczak
  • Function : Author
Henric Krawczynski
  • Function : Author
Fabio La Monaca
  • Function : Author
Luca Latronico
  • Function : Author
Simone Maldera
  • Function : Author
Alberto Manfreda
  • Function : Author
Andrea Marinucci
  • Function : Author
Francesco Massaro
  • Function : Author
Giorgio Matt
  • Function : Author
Ikuyuki Mitsuishi
  • Function : Author
Tsunefumi Mizuno
  • Function : Author
C. -Y. Ng
  • Function : Author
Stephen L. O'Dell
  • Function : Author
Chiara Oppedisano
  • Function : Author
Alessandro Papitto
  • Function : Author
George G. Pavlov
  • Function : Author
Abel L. Peirson
  • Function : Author
Melissa Pesce-Rollins
  • Function : Author
Maura Pilia
  • Function : Author
Andrea Possenti
  • Function : Author
Juri Poutanen
  • Function : Author
Brian D. Ramsey
  • Function : Author
John Rankin
  • Function : Author
Ajay Ratheesh
  • Function : Author
Roger W. Romani
  • Function : Author
Carmelo Sgrò
  • Function : Author
Patrick Slane
  • Function : Author
Paolo Soffitta
  • Function : Author
Gloria Spandre
  • Function : Author
Toru Tamagawa
  • Function : Author
Roberto Taverna
  • Function : Author
Yuzuru Tawara
  • Function : Author
Allyn F. Tennant
  • Function : Author
Nicolas E. Thomas
  • Function : Author
Francesco Tombesi
  • Function : Author
Alessio Trois
  • Function : Author
Sergey Tsygankov
  • Function : Author
Roberto Turolla
  • Function : Author
Jacco Vink
  • Function : Author
Martin C. Weisskopf
  • Function : Author
Kinwah Wu
  • Function : Author
Fei Xie
  • Function : Author
Silvia Zane
  • Function : Author

Abstract

Particle acceleration mechanisms in supermassive black hole jets, such as shock acceleration, magnetic reconnection, and turbulence, are expected to have observable signatures in the multiwavelength polarization properties of blazars. The recent launch of the Imaging X-Ray Polarimetry Explorer (IXPE) enables us, for the first time, to use polarization in the X-ray band (2-8 keV) to probe the properties of the jet synchrotron emission in high-synchrotron-peaked BL Lac objects (HSPs). We report the discovery of X-ray linear polarization (degree Πx = 15% ± 2% and electric vector position angle ψ x = 35° ± 4°) from the jet of the HSP Mrk 421 in an average X-ray flux state. At the same time, the degree of polarization at optical, infrared, and millimeter wavelengths was found to be lower by at least a factor of 3. During the IXPE pointing, the X-ray flux of the source increased by a factor of 2.2, while the polarization behavior was consistent with no variability. The higher level of Πx compared to longer wavelengths, and the absence of significant polarization variability, suggest a shock is the most likely X-ray emission site in the jet of Mrk 421 during the observation. The multiwavelength polarization properties are consistent with an energy-stratified electron population, where the particles emitting at longer wavelengths are located farther from the acceleration site, where they experience a more disordered magnetic field.
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insu-03828205 , version 1 (25-10-2022)

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Laura Di Gesu, Immacolata Donnarumma, Fabrizio Tavecchio, Iván Agudo, Thibault Barnounin, et al.. The X-Ray Polarization View of Mrk 421 in an Average Flux State as Observed by the Imaging X-Ray Polarimetry Explorer. The Astrophysical journal letters, 2022, 938, ⟨10.3847/2041-8213/ac913a⟩. ⟨insu-03828205⟩
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