[ Previous | Next | ADS ]

Glitch event observed in the Vela pulsar (PSR J0835-4510)

ATel #6903; Fabian Jankowski (Swinburne University of Technology), Matthew Bailes (Swinburne University of Technology), Ewan Barr (Swinburne University of Technology), Timothy Bateman (CSIRO), Shivani Bhandari (Swinburne University of Technology), Frank Briggs (ANU), Manisha Caleb (ANU), Duncan Campbell-Wilson (University of Sydney), Chris Flynn (Swinburne University of Technology), Anne Green (University of Sydney), Richard Hunstead (University of Sydney), Andrew Jameson (Swinburne University of Technology), Evan Keane (Swinburne University of Technology), Vikram Ravi (Swinburne University of Technology), Vivek Venkatraman Krishnan (Swinburne University of Technology), Willem van Straten (Swinburne University of Technology)
on 12 Jan 2015; 03:47 UT
Credential Certification: Evan Keane (ekean@jb.man.ac.uk)

Subjects: Radio, Neutron Star, Transient, Pulsar

We are in the process of refurbishing the Molonglo Observatory Synthesis radio Telescope (MOST) near Canberra, Australia with a new digital backend, correlator and beam former (the UTMOST upgrade). We carry out timing observations of the Vela pulsar (PSR J0835-4510) with nearly daily cadence.

We detected a glitch event in the recent timing data. Our preliminary analysis shows a change in its rotation frequency on MJD 56922 +- 3 (2014-09-22 UT) by |delta F0/F0| = 3.9E-10 which is accompanied by a change in spin down rate by |delta F1/F1| = 8.0E-05. To more accurately model the observed arrival times required a change in F2 with value |delta F2/F2| = 7.5E-01.

This link shows a plot of the best least-squares fit of our glitch model to our data: best fit of glitch model to post-fit residuals.

We will continue to monitor the pulsar and we encourage other observers to help resolve the pulsar's glitch recovery.