X 射线脉冲星 X Persei 的 X 射线偏振：又一个正交转子？
高能天体物理现象
2023-07-05 v1 太阳与恒星天体物理
摘要
X Persei 是一个位于 Be 双星系统中、周期约为 835 s 的持久低光度 X 射线脉冲星。中子星表面的磁场强度尚不精确已知，但间接迹象表明磁场高于 G，这使其成为已知磁化最强的 X 射线脉冲星之一。本文我们展示了使用成像 X 射线偏振探测器（IXPE）对 X Persei 的观测结果。发现 X 射线偏振信号强烈依赖于脉冲星的自转相位。在 3-8 keV 能段中，能量平均偏振度在脉冲周期内从百分之几变化到 20%，并与脉冲 X 射线通量呈正相关。偏振角显示出显著变化，并在脉冲周期内完成两次完整旋转，导致脉冲相位平均偏振近乎为零。将旋转矢量模型应用于 IXPE 数据，我们获得了自转轴倾角、其在天空中的位置角以及磁倾角的估计。所得倾角接近于先前报道的 X Persei 的轨道倾角。偏振数据意味着自转轴与磁偶极轴之间存在大角度，这与近期报道的 X 射线脉冲星 GRO J100857 的结果相似。在使用最佳拟合旋转矢量模型消除偏振角随脉冲星相位旋转的影响后，发现了偏振度对能量的强烈依赖，其值从 2 keV 处的 0% 增加到 8 keV 处的 30%。
引用
@article{arxiv.2303.17325,
title = {X-ray polarimetry of X-ray pulsar X Persei: another orthogonal rotator?},
author = {A. A. Mushtukov and S. S. Tsygankov and J. Poutanen and V. Doroshenko and A. Salganik and E. Costa and A. Di Marco and J. Heyl and F. La Monaca and A. A. Lutovinov and I. A. Mereminsky and A. Papitto and A. N. Semena and A. E. Shtykovsky and V. F. Suleimanov and S. V. Forsblom and D. González-Caniulef and C. Malacaria and R. A. Sunyaev and I. Agudo and L. A. Antonelli and M. Bachetti and L. Baldini and W. H. Baumgartner and R. Bellazzini and S. Bianchi and S. D. Bongiorno and R. Bonino and A. Brez and N. Bucciantini and F. Capitanio and S. Castellano and E. Cavazzuti and C. -T. Chen and S. Ciprini and A. De Rosa and E. Del Monte and L. Di Gesu and N. Di Lalla and I. Donnarumma and M. Dovčiak and S. R. Ehlert and T. Enoto and Y. Evangelista and S. Fabiani and R. Ferrazzoli and J. A. Garcia and S. Gunji and K. Hayashida and W. Iwakiri and S. G. Jorstad and P. Kaaret and V. Karas and F. Kislat and T. Kitaguchi and J. J. Kolodziejczak and H. Krawczynski and L. Latronico and I. Liodakis and S. Maldera and A. Manfreda and F. Marin and A. P. Marscher and H. L. Marshall and F. Massaro and G. Matt and I. Mitsuishi and T. Mizuno and F. Muleri and M. Negro and C. -Y. Ng and S. L. O'Dell and N. Omodei and C. Oppedisano and G. G. Pavlov and A. L. Peirson and M. Perri and M. Pesce-Rollins and P. -O. Petrucci and M. Pilia and A. Possenti and S. Puccetti and B. D. Ramsey and J. Rankin and A. Ratheesh and O. J. Roberts and R. W. Romani and C. Sgrò and P. Slane and P. Soffitta and G. Spandre and D. A. Swartz and T. Tamagawa and F. Tavecchio and R. Taverna and Y. Tawara and A. F. Tennant and N. E. Thomas and F. Tombesi and A. Trois and R. Turolla and J. Vink and M. C. Weisskopf and K. Wu and F. Xie and S. Zane},
journal= {arXiv preprint arXiv:2303.17325},
year = {2023}
}
备注
11 pages, 7 figures, submitted to MNRAS