Confirmation of glitch event observed in PSR J0742-2822
ATel #15631; L. Dunn (University of Melbourne, "UMelb"), C. Flynn (Swinburne University of Technology, "SUT"), M. Bailes (SUT), T. Bateman (SUT), D. Campbell-Wilson (Woodchester Observatory), A. Deller (SUT), A. J. Green (University of Sydney), V. Gupta (SUT), A. Jameson (SUT), Y. S. C. Lee (UMelb), A. Mandlik (SUT), A. Melatos (UMelb), G. Urquhart (SUT)
on 26 Sep 2022; 00:39 UT
Credential Certification: Chris Flynn (cflynn@swin.edu.au)
Referred to by ATel #: 15638
At Molonglo Observatory Synthesis Radio Telescope (MOST) near Canberra, Australia, we carry out a pulsar timing programme in which we observe 172 pulsars with near-daily cadence, as part of the UTMOST project (Bailes et al. 2017). Observations are at a central frequency of 831 MHz and with a bandwidth of 45 MHz.
We confirm the detection of a glitch in PSR J0742-2822, recently reported by Shaw et al. (ATel #15622) and Grover et al. (ATel #15629). Our first post-glitch observation was taken at MJD 59844.9 (2022-09-22 UTC). The automated glitch detection pipeline in place at UTMOST, based on the algorithm of Melatos et al. 2020, confidently detected the glitch with a natural log Bayes factor of 123. Our preliminary analysis shows a change in its rotation frequency by deltaF0/F0 = 4294(1)E-9. Although our observations are not dense enough to accurately constrain the glitch epoch, our data are consistent with a glitch epoch of approximately 59389.4 as reported previously.
We will continue to monitor the pulsar and we encourage other observers to help resolve the pulsar's glitch recovery.
References:
Bailes, M, et al., 2017, PASA, 34, e045.
https://astronomy.swin.edu.au/research/utmost/
Melatos, A, et al., 2020, The Astrophysical Journal, 896, 78
