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Journal Articles The Astrophysical Journal Year : 2022

X-Ray Polarization Detection of Cassiopeia A with IXPE

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

Abstract

We report on a ~5σ detection of polarized 3-6 keV X-ray emission from the supernova remnant Cassiopeia A (Cas A) with the Imaging X-ray Polarimetry Explorer (IXPE). The overall polarization degree of 1.8% ± 0.3% is detected by summing over a large region, assuming circular symmetry for the polarization vectors. The measurements imply an average polarization degree for the synchrotron component of ~2.5%, and close to 5% for the X-ray synchrotron-dominated forward shock region. These numbers are based on an assessment of the thermal and nonthermal radiation contributions, for which we used a detailed spatial-spectral model based on Chandra X-ray data. A pixel-by-pixel search for polarization provides a few tentative detections from discrete regions at the ~ 3σ confidence level. Given the number of pixels, the significance is insufficient to claim a detection for individual pixels, but implies considerable turbulence on scales smaller than the angular resolution. Cas A's X-ray continuum emission is dominated by synchrotron radiation from regions within ≲1017 cm of the forward and reverse shocks. We find that (i) the measured polarization angle corresponds to a radially oriented magnetic field, similar to what has been inferred from radio observations; (ii) the X-ray polarization degree is lower than in the radio band (~5%). Since shock compression should impose a tangential magnetic-field structure, the IXPE results imply that magnetic fields are reoriented within ~1017 cm of the shock. If the magnetic-field alignment is due to locally enhanced acceleration near quasi-parallel shocks, the preferred X-ray polarization angle suggests a size of 3 × 1016 cm for cells with radial magnetic fields.
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insu-03822787 , version 1 (20-10-2022)

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Jacco Vink, Dmitry Prokhorov, Riccardo Ferrazzoli, Patrick Slane, Ping Zhou, et al.. X-Ray Polarization Detection of Cassiopeia A with IXPE. The Astrophysical Journal, 2022, 938, ⟨10.3847/1538-4357/ac8b7b⟩. ⟨insu-03822787⟩
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