利用IXPE对仙后座A的X射线偏振探测
高能天体物理现象
2022-10-26 v2
摘要
我们报告利用成像X射线偏振探测器（IXPE）对超新星遗迹仙后座A的3-6 keV偏振X射线发射的探测。在假定偏振矢量圆对称的前提下，通过对大区域求和，探测到总体偏振度%。这些测量意味着同步辐射成分的平均偏振度约为%，而X射线同步辐射主导的前向激波区域接近5%。这些数值基于对热与非热辐射贡献的评估，其中我们使用了基于Chandra X射线数据的详细空间-光谱模型。逐像素的偏振搜索在置信水平下从离散区域给出若干暂定探测。鉴于像素数量，该显著性不足以宣称单个像素的探测，但意味着小于角分辨率尺度的显著湍流。Cas A的X射线连续辐射由距前向与反向激波 cm区域内同步辐射主导。我们发现：i）测得的偏振角对应于径向取向的磁场，类似于由射电观测推断的结果；ii）X射线偏振度低于射电波段（%）。由于激波压缩应施加切向磁场结构，IXPE结果意味着磁场在距激波cm内被重新取向。若磁场排列归因于准平行激波附近局部增强的加速，优选的X射线偏振角暗示具有径向磁场的胞元尺寸为 cm。
引用
@article{arxiv.2206.06713,
title = {X-ray polarization detection of Cassiopeia A with IXPE},
author = {Jacco Vink and Dmitry Prokhorov and Riccardo Ferrazzoli and Patrick Slane and Ping Zhou and Kazunori Asakura and Luca Baldini and Niccolo Bucciantini and Enrico Costa and Alessandro Di Marco and Jeremy Heyl and Frederic Marin and Tsunefumi Mizuno and C. Y. Ng and Melissa Pesce-Rollins and Brian D. Ramsey and John Rankin and Ajay Ratheesh and Carmelo Sgro and Paolo Soffitta and Douglas A. Swartz and Toru Tamagawa and Martin C. Weisskopf and Yi-Jung Yang and Ronaldo Bellazzini and Raffaella Bonino and Elisabetta Cavazzuti and Luigi Costamante and Niccolo Di Lalla and Luca Latronico and Simone Maldera and Alberto Manfreda and Francesco Massaro and Ikuyuki Mitsuishi and Nicola Omodei and Chiara Oppedisano and Silvia Zane and Ivan Agudo and Lucio A. Antonelli and Matteo Bachetti and Wayne H. Baumgartner and Stefano Bianchi and Stephen D. Bongiorno and Alessandro Brez and Fiamma Capitanio and Simone Castellano and Stefano Ciprini and Alessandra De Rosa and Ettore Del Monte and Laura Di Gesu and Immacolata Donnarumma and Victor Doroshenko and Michal Dovciak and Steven R. Ehlert and Teruaki Enoto and Yuri Evangelista and Sergio Fabiani and Javier A. Garcia and Shuichi Gunji and Kiyoshi Hayashida and Wataru Iwakiri and Svetlana G. Jorstad and Vladimir Karas and Takao Kitaguchi and Jeffery J. Kolodziejczak and Henric Krawczynski and Fabio La Monaca and Ioannis Liodakis and Andrea Marinucci and Alan P. Marscher and Herman L. Marshall and Giorgio Matt and Fabio Muleri and Stephen L. O'Dell and Alessandro Papitto and George G. Pavlov and Abel L. Peirson and Matteo Perri and Maura Pilia and Andrea Possenti and Juri Poutanen and Simonetta Puccetti and Roger W. Romani and Gloria Spandre and Fabrizio Tavecchio and Roberto Taverna and Yuzuru Tawara and Allyn F. Tennant and Nicolas E. Thomas and Francesco Tombesi and Alessio Trois and Sergey Tsygankov and Roberto Turolla and Kinwah Wu and Fei Xie},
journal= {arXiv preprint arXiv:2206.06713},
year = {2022}
}
备注
IXPE collaboration paper. Accepted by the Astrophysical Journal. This version reflects the version accepted by ApJ. With respect to version 1: new figures added to the Appendix and extension to the text, in particular the discussion section and Appendix