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The High Time Resolution Universe Pulsar Survey – V. Single-pulse energetics and modulation properties of 315 pulsars

Burke-Spolaor, S. and Johnston, S. and Bailes, M. and Bates, S. D. and Bhat, N. D. R. and Burgay, M. and Champion, D. J. and D'Amico, N. and Keith, M. J. and Kramer, M. and Levin, L. and Milia, S. and Possenti, S. and Stappers, B. and van Straten, W. (2012) The High Time Resolution Universe Pulsar Survey – V. Single-pulse energetics and modulation properties of 315 pulsars. Monthly Notices of the Royal Astronomical Society, 423 (2). pp. 1351-1367. ISSN 0035-8711. http://resolver.caltech.edu/CaltechAUTHORS:20130214-090251768

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Abstract

We report on the pulse-to-pulse energy distributions and phase-resolved modulation properties for catalogued pulsars in the southern High Time Resolution Universe intermediate-latitude survey. We selected the 315 pulsars detected in a single-pulse search of this survey, allowing a large sample unbiased regarding any rotational parameters of neutron stars. We found that the energy distribution of many pulsars is well described by a log-normal distribution, with few deviating from a small range in log-normal scale and location parameters. Some pulsars exhibited multiple energy states corresponding to mode changes, and implying that some observed ‘nulling’ may actually be a mode-change effect. PSR J1900−2600 was found to emit weakly in its previously identified ‘null’ state. We found evidence for another state-change effect in two pulsars, which show bimodality in their nulling time-scales; that is, they switch between a continuous-emission state and a single-pulse-emitting state. Large modulation occurs in many pulsars across the full integrated profile, with increased sporadic bursts at leading and trailing sub-beam edges. Some of these high-energy outbursts may indicate the presence of ‘giant pulse’ phenomena. We found no correlation with modulation and pulsar period, age or other parameters. Finally, the deviation of integrated pulse energy from its average value was generally quite small, despite the significant phase-resolved modulation in some pulsars; we interpret this as tenuous evidence of energy regulation between distinct pulsar sub-beams.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://arxiv.org/abs/1203.6068arXivDiscussion Paper
http://dx.doi.org/10.1111/j.1365-2966.2012.20998.xDOIArticle
http://mnras.oxfordjournals.org/content/423/2/1351.abstractPublisherArticle
http://mnras.oxfordjournals.org/content/423/2/1351/suppl/DC1PublisherSupplementary Data
Additional Information:© 2012 CSIRO Monthly Notices of the Royal Astronomical Society. First published online June 21, 2012. Accepted 2012 March 19.. In original form 2012 March 15. The Parkes radio telescope is part of the Australia Telescope National Facility which is funded by the Commonwealth of Australia for operation as a National Facility managed by CSIRO. A portion of research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration.
Group:TAPIR
Funders:
Funding AgencyGrant Number
Commonwealth Scientific and Research Organization (CSIRO)UNSPECIFIED
NASA/JPL/CaltechUNSPECIFIED
Non-Subject Keywords:astronomical databases: miscellaneous; pulsars general
Record Number:CaltechAUTHORS:20130214-090251768
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20130214-090251768
Official Citation:S. Burke-Spolaor, S. Johnston, M. Bailes, S. D. Bates, N. D. R. Bhat, M. Burgay, D. J. Champion, N. D’Amico, M. J. Keith, M. Kramer, L. Levin, S. Milia, A. Possenti, B. Stappers, and W. van Straten The High Time Resolution Universe Pulsar Survey – V. Single-pulse energetics and modulation properties of 315 pulsars MNRAS (2012) Vol. 423 1351-1367 doi:10.1111/j.1365-2966.2012.20998.x First published online June 21, 2012
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:36917
Collection:CaltechAUTHORS
Deposited By: JoAnn Boyd
Deposited On:20 Feb 2013 20:02
Last Modified:13 Apr 2016 22:58

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