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A survey of nulling pulsars using the Giant Meterwave Radio Telescope

Published online by Cambridge University Press:  20 March 2013

Vishal Gajjar
Affiliation:
NCRA-TIFR, India email: gajjar@ncra.tifr.res.in
Bhal Chandra Joshi
Affiliation:
NCRA-TIFR, India email: gajjar@ncra.tifr.res.in
Michael Kramer
Affiliation:
MPI für Radioastronomie, Germany
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Abstract

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Several pulsars show sudden cessation of pulsed emission, which is known as pulsar nulling. In this paper, the nulling behaviour of 15 pulsars is presented. The nulling fraction of these pulsars, along with the degree of reduction in the pulse energy during the null phase are reported for these pulsars. A unique nulling behaviour is re- ported for PSR J1738-2330, which also showed quasi-periodic bursts. The distributions of lengths of the null and burst phases as well as the typical nulling time scales are estimated for eight strong pulsars. A comparison of the nulling time scales of four pulsars with similar nulling fraction suggests that the fraction of null pulses probably does not quantify the nulling behaviour of a pulsar in full detail. Analysis of these distributions also indicate that while the null and the burst pulses occur in groups, the transition from the null to burst phase and vice verse can be modeled by a Poisson point process.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013
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