X-Ray Polarimetry of the Crab Nebula with PolarLight: Polarization Recovery after the Glitch and a Secular Position Angle Variation
Xiangyun Long, Hua Feng, Hong Li, Jiahuan Zhu, Qiong Wu, Jiahui Huang, M. Minuti, Weichun Jiang, Weihua Wang, Renxin Xu, E. Costa, Dongxin Yang, Saverio Citraro, Hikmat Nasimi, Jiandong Yu, Ge Jin, M. Zeng, Peng An, L. Baldini, R. Bellazzini, A. Brez, L. Latronico, C. Sgró, G. Spandre, Michele Pinchera, Fabio Muleri, P. Soffitta
Abstract
Abstract We report follow-up observations of the Crab Nebula with the PolarLight X-ray polarimeter, which revealed a possible variation in polarization associated with a pulsar glitch in 2019. The new observations confirm that the polarization has recovered roughly 100 days after the glitch. With the new observations, we find that the polarization angle (PA) measured with PolarLight from the total nebular emission has a difference of 18.°0 ± 4.°6 from that measured 42 yr ago with OSO-8, indicating a secular evolution of polarization with either the Crab Nebula or pulsar. The long-term variation in PA could be a result of multiple glitches in the history, magnetic reconnection, or movement of synchrotron emitting structures in the nebula, or secular evolution of the pulsar magnetic geometry.