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arxiv: 2407.12779 · v1 · pith:R5QMMO2Nnew · submitted 2024-07-17 · 🌌 astro-ph.HE

Analysis of Crab X-ray Polarization using Deeper IXPE Observations

Josephine Wong , Tsunefumi Mizuno , Niccol\'o Bucciantini , Roger W. Romani , Yi-Jung Yang , Kuan Liu , Wei Deng , Kazuho Goya
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Fei Xie Maura Pilia Philip Kaaret Martin C. Weisskopf Stefano Silvestri C.-Y. Ng Chien-Ting Chen Iv\'an Agudo Lucio A. Antonelli Matteo Bachetti Luca Baldini Wayne H. Baumgartner Ronaldo Bellazzini Stefano Bianchi Stephen D. Bongiorno Raffaella Bonino Alessandro Brez Fiamma Capitanio Simone Castellano Elisabetta Cavazzuti Stefano Ciprini Enrico Costa Alessandra De Rosa Ettore Del Monte Laura Di Gesu Niccol\'o Di Lalla Alessandro Di Marco Immacolata Donnarumma Victor Doroshenko Michal Dov\v{c}iak Steven R. Ehlert Teruaki Enoto Yuri Evangelista Sergio Fabiani Riccardo Ferrazzoli Javier A. Garcia Shuichi Gunji Jeremy Heyl Wataru Iwakiri Svetlana G. Jorstad Vladimir Karas Fabian Kislat Takao Kitaguchi Jeffery J. Kolodziejczak Henric Krawczynski Fabio La Monaca Luca Latronico Ioannis Liodakis Simone Maldera Alberto Manfreda Fr\'ed\'eric Marin Andrea Marinucci Alan P. Marscher Herman L. Marshall Francesco Massaro Giorgio Matt Ikuyuki Mitsuishi Fabio Muleri Michela Negro Stephen L. O'Dell Nicola Omodei Chiara Oppedisano Alessandro Papitto George G. Pavlov Abel Lawrence Peirson Matteo Perri Melissa Pesce-Rollins Pierre-Olivier Petrucci Andrea Possenti Juri Poutanen Simonetta Puccetti Brian D. Ramsey John Rankin Ajay Ratheesh Oliver J. Roberts Carmelo Sgr\'o Patrick Slane Paolo Soffitta Gloria Spandre Douglas A. Swartz Toru Tamagawa Fabrizio Tavecchio Roberto Taverna Yuzuru Tawara Allyn F. Tennant Nicholas E. Thomas Francesco Tombesi Alessio Trois Sergey Tsygankov Roberto Turolla Jacco Vink Kinwah Wu Silvia Zane
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classification 🌌 astro-ph.HE
keywords polarizationfieldixpealonganalysiscrabdegreeinner
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We present Crab X-ray polarization measurements using IXPE data with a total exposure of 300ks, three times more than the initial 2022 discovery paper. Polarization is detected in three times more pulsar phase bins, revealing an S-shaped $+40^\circ$ polarization angle sweep in the main pulse and ${>}1\sigma$ departures from the OPTIMA optical polarization in both pulses, suggesting different radiation mechanisms or sites for the polarized emission at the two wavebands. Our polarization map of the inner nebula reveals a toroidal magnetic field, as seen in prior IXPE analyses. Along the southern jet, the magnetic field orientation relative to the jet axis changes from perpendicular to parallel and the polarization degree decreases by ${\sim}6\%$. These observations may be explained by kink instabilities along the jet or a collision with a dense, jet-deflecting medium at the tip. Using spectropolarimetric analysis, we find asymmetric polarization in the four quadrants of the inner nebula, as expected for a toroidal field geometry, and a spatial correlation between polarization degree and photon index.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Refined Constraints on the Hard X-ray Polarization of the Crab Pulsar and Nebula Derived from an Extended XL-Calibur Dataset

    astro-ph.HE 2026-04 accept novelty 6.0

    Refined Crab nebula polarization is 27.7 ± 4.9% at 127.2 ± 5.1 degrees in 19-64 keV, with a new pulsar-based phase recovery method enabling inclusion of 95% of GPS-off data for stronger phase-resolved constraints.