X-Ray Polarimetry of the Crab Nebula with PolarLight: Polarization Recovery after the Glitch and a Secular Position Angle Variation

Journal
Date Issued
2021
Author(s)
Long, Xiangyun
•
Feng, Hua
•
Li, Hong
•
Zhu, Jiahuan
•
Wu, Qiong
•
Huang, Jiahui
•
Minuti, Massimo
•
Jiang, Weichun
•
Wang, Weihua
•
Xu, Renxin
•
•
Yang, Dongxin
•
Citraro, Saverio
•
Nasimi, Hikmat
•
Yu, Jiandong
•
Jin, Ge
•
Zeng, Ming
•
An, Peng
•
Baldini, Luca
•
Bellazzini, Ronaldo
•
Brez, Alessandro
•
Latronico, Luca
•
Sgrò, Carmelo
•
Spandre, Gloria
•
Pinchera, Michele
•
•
DOI
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.
Volume
912
Issue
2
Start page
L28
Uri
Url
Issn Identifier
2041-8205
Ads BibCode
2021ApJ...912L..28L
Rights
open.access
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