Spin-down and emission variations for PSR J0742-2822
Abstract
PSR J0742-2822 is known for its quasi-periodic changes in the observed pulse profile and spindown 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.
- Publication:
-
Research in Astronomy and Astrophysics
- Pub Date:
- March 2021
- DOI:
- 10.1088/1674-4527/21/2/42
- Bibcode:
- 2021RAA....21...42D
- Keywords:
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- pulsars: general;
- stars: pulsar;
- methods: timing