Journal article

Mode switching and oscillations in PSR B1828-11

IH Stairs, AG Lyne, M Kramer, BW Stappers, J van Leeuwen, A Tung, RN Manchester, GB Hobbs, DR Lorimer, A Melatos



The young pulsar PSR B1828-11 has long been known to show correlated shape and spindown changes with time-scales of roughly 500 and 250 d, perhaps associated with large-scale magnetospheric switching. Here, we present multihour observations with the Parkes and Green Bank Telescopes at multiple phases across the 500-d cycle and show that the pulsar undergoes mode-changing between two stable, extreme profile states. The fraction of time spent in each profile state naturally accounts for the observed overall 'shape parameter' (defined to be 0 for wide profiles and 1 for narrow ones); this and the variable rate of the mode transitions are directly related to the spindown changes. We observe that..

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University of Melbourne Researchers


Awarded by Netherlands Organisation for Scientific Research (NWO) under project 'CleanMachine'

Awarded by NSF RII Track I award

Funding Acknowledgements

IHS is supported by an NSERC Discovery Grant and by the Canadian Institute for Advanced Research. Pulsar research at the Jodrell Bank Centre for Astrophysics and the observations using the Lovell Telescope are supported by a consolidated grant from the STFC in the UK. JvL received funding for this research from the Netherlands Organisation for Scientific Research (NWO) under project 'CleanMachine' (614.001.301). DRL was supported by NSF RII Track I award number 1458952. The Green Bank Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. The Parkes radio telescope is part of the Australia Telescope National Facility which is funded by the Australian Government for operation as a National Facility managed by CSIRO. This research made use of Astropy, a community-developed core Python package for Astronomy (Astropy Collaboration, 2013). We thank Ryan Hyslop, Jennifer Riley, Raymond Lum, Cindy Tamand Sarah (Traine) Keith for their work on earlier versions of the analysis.