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Polarized x-rays from a magnetar

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arxiv 2205.08898 v1 pith:RBODMX2C submitted 2022-05-18 astro-ph.HE

Polarized x-rays from a magnetar

Roberto Taverna , Roberto Turolla , Fabio Muleri , Jeremy Heyl , Silvia Zane , Luca Baldini , Denis Gonz\'alez Caniulef , Matteo Bachetti
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John Rankin Ilaria Caiazzo Niccol\`o Di Lalla Victor Doroshenko Manel Errando Ephraim Gau Demet K{\i}rm{\i}z{\i}bayrak Henric Krawczynski Michela Negro Mason Ng Nicola Omodei Toru Tamagawa Keisuke Uchiyama Martin C. Weisskopf Ivan Agudo Lucio A. Antonelli Wayne H. Baumgartner Ronaldo Bellazzini Stefano Bianchi Stephen D. Bongiorno Raffaella Bonino Alessandro Brez Niccol\`o Bucciantini Fiamma Capitanio Simone Castellano Elisabetta Cavazzuti Stefano Ciprini Enrico Costa Alessandra De Rosa Ettore Del Monte Laura Di Gesu Alessandro Di Marco Immacolata Donnarumma Michal Dov\v{c}iak Steven R. Ehlert Teruaki Enoto Yuri Evangelista Sergio Fabiani Riccardo Ferrazzoli Javier A. Garcia Shuichi Gunji Kiyoshi Hayashida Wataru Iwakiri Svetlana G. Jorstad Vladimir Karas Takao Kitaguchi Jeffery J. Kolodziejczak Fabio La Monaca Luca Latronico Ioannis Liodakis Simone Maldera Alberto Manfreda Fr\'ed\'eric Marin Andrea Marinucci Alan P. Marscher Herman L. Marshall Giorgio Matt Ikuyuki Mitsuishi Tsunefumi Mizuno Stephen C.-Y. Ng Stephen L. O'Dell Chiara Oppedisano Alessandro Papitto George G. Pavlov Abel L. Peirson Matteo Perri Melissa Pesce-Rollins Maura Pilia Andrea Possenti Juri Poutanen Simonetta Puccetti Brian D. Ramsey Ajay Ratheesh Roger W. Romani Carmelo Sgr\`o Patrick Slane Paolo Soffitta Gloria Spandre Fabrizio Tavecchio Yuzuru Tawara Allyn F. Tennant Nicolas E. Thomas Francesco Tombesi Alessio Trois Sergey Tsygankov Jacco Vink Kinwah Wu Fei Xie
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keywords ixpepolarizationx-raydegreeneutronobservationspolarizedstar
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We report on the first detection of linearly polarized x-ray emission from an ultra-magnetized neutron star with the Imaging X-ray Polarimetry Explorer (IXPE). The IXPE 35 observations of the anomalous x-ray pulsar 4U 0142+61 reveal a linear polarization degree of $(12\pm 1)\%$ throughout the IXPE 2--8 keV band. We detect a substantial variation of the polarization with energy: the degree is $(14\pm 1)\%$ at 2--4 keV and $(41\pm 7)\%$ at 5.5--8 keV, while it drops below the instrumental sensitivity around 4--5 keV, where the polarization angle swings by $\sim 90^\circ$. The IXPE observations give us completely new information about the properties of the neutron star surface and magnetosphere and lend further support to the presence of the quantum mechanical effect of vacuum birefringence.

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  1. Detectability of Magnetar-Induced Vacuum Birefringence with IXPE and eXTP

    hep-ph 2026-05 unverdicted novelty 4.0

    Vacuum birefringence time delays from magnetars are an order of magnitude larger than previous estimates and should be quantitatively measurable by IXPE and eXTP, especially for 1RXS J170849.0-400910.