A glitch in the radio-emitting magnetar PSR J1809-1943
ATel #16086; 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 16 Jun 2023; 09:32 UT
Credential Certification: Benjamin Shaw (benjamin.shaw@manchester.ac.uk)
Subjects: Radio, Neutron Star, Pulsar, Magnetar
Referred to by ATel #: 16164
We have observed a glitch in the pulse arrival times of the radio-emitting magnetar PSR J1809-1943/XTE 1810-197, which we monitor routinely as part of the pulsar timing programme at the Jodrell Bank Observatory. PSR J1809-1943 has a spin-frequency of ~0.2 Hz and a inferred magnetic flux density of ~2E14 G. We observe this source with an average cadence of once every five days using a 384 MHz wide band, centred on 1520 MHz. The glitch is the first known such event in this source, though it is possible that earlier glitches are obscured by the strong timing noise that is exhibited by the magnetar. The glitch was detected using an automated glitch detection pipeline. Preliminary analysis indicates that the magnetar underwent a step change in spin-frequency of (1.74+/-0.29)E-07 Hz (1-sigma), corresponding to a fractional rotational spin-up of (9.6+/-1.6)E-07. We constrain the glitch epoch to be MJD 60099+/-7. We are continuing to monitor the post-glitch evolution of PSR J1809-1943, in order to identify any step-changes to the spin-down rate and examine any glitch-associated changes to the radio pulse profile. Follow-up observations at other wavelengths are also encouraged.
