A revised interpretation of the reported glitch in PSR J1809-1943
ATel #16164; Benjamin Shaw (University of Manchester), Andrew Lyne (UoM), Mitchell Mickaliger (UoM), Lina Levin (UoM), Benjamin Stappers (UoM), Michael Keith (UoM), Patrick Weltevrede (UoM), Kaustubh Rajwade (ASTRON), Manisha Caleb (University of Sydney)
on 31 Jul 2023; 11:50 UT
Credential Certification: Benjamin Shaw (benjamin.shaw@manchester.ac.uk)
Subjects: Radio, Neutron Star, Pulsar, Magnetar
The radio-emitting magnetar PSR J1809-1943/XTE 1810-197 was recently observed to have undergone a step change to its rotational properties, which was interpreted in ATel #16086 as a glitch in its spin frequency. In the following weeks, having conducted regular follow-up monitoring using the Lovell and Mark II radio telescopes at the Jodrell Bank Observatory, we find that the observed pulse times-of-arrival are better explained by a dramatic and unusual step decrease in the magnetar's spin-down rate of 18% which occurred around MJD 60107. We continue to regularly monitor the magnetar as part of the Jodrell Bank pulsar timing programme.
