Vol 21, No 2

Spin-down and emission variations for PSR J0742−2822

Shi-Jun Dang, Na Wang, Hui-Hui Wang, Jian-Ping Yuan, Lun-Hua Shang, Rai Yuen, Ming-Yu Ge, Xia Zhou, Shuang-Qiang Wang, Fei-Fei Kou, Wei-Ming Yan, Jing-Bo Wang, Zhi-Gang Wen, Jun-Tao Bai, Zhi-Yong Liu, Zu-Rong Zhou


Abstract PSR J0742−2822 is known for its quasi-periodic changes in the observed pulse profile and spin-down rate. In this paper, we analyzed 13 years of timing data obtained with the Nanshan 25-m radio telescope and the Parkes 64-m radio telescope. We found that the average values of the spin-down rate (\(\langle\dot{\nu}\rangle\)) of this pulsar changed in four different states. We investigated the correlation between \(\dot{\nu}\) and W50, and ascertained that the correlation changed in different \(\langle\dot{\nu}\rangle\) states. Moreover, not all the changes in (\langle\dot{\nu}\rangle\) states and correlation can be associated with glitch activities. We examined the long term evolution of γ-ray flux (0.1–300 GeV) and the pulse profiles corresponding to the four different states using Fermi-LAT Pass 8 (P8R3) data from 2008 August 5 to 2019 October 1. We did not detect a significant change in γ-ray flux or the pulse profile. Our results suggest that the connection between pulsar rotation and emission is more complex than previously reported for this pulsar.


Keywords pulsars: general — stars: pulsar — methods: timing

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