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Explaining the subpulse drift velocity of pulsar magnetosphere within the space-charge limited flow model

Morozova, Viktoriya S. and Ahmedov, Bobomurat J. and Zanotti, Olindo (2014) Explaining the subpulse drift velocity of pulsar magnetosphere within the space-charge limited flow model. Monthly Notices of the Royal Astronomical Society, 444 (2). pp. 1144-1156. ISSN 0035-8711. doi:10.1093/mnras/stu1486.

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We try to explain the subpulse drift phenomena adopting the space-charge limited flow model and comparing the plasma drift velocity in the inner region of pulsar magnetospheres with the observed velocity of drifting subpulses. We apply the approach described in a recent paper of van Leeuwen & Timokhin, where it was shown that the standard estimation of the subpulse drift velocity through the total value of the scalar potential drop in the inner gap gives inaccurate results, while the exact expression relating the drift velocity to the gradient of the scalar potential should be used instead. After considering a selected sample of sources taken from the catalogue of Weltevrede et al. with coherently drifting subpulses and reasonably known observing geometry, we show that their subpulse drift velocities would correspond to the drift of the plasma located very close or above the pair formation front. Moreover, a detailed analysis of PSR B0826−34 and PSR B0818−41 reveals that the variation of the subpulse separation with the pulse longitude can be successfully explained by the dependence of the plasma drift velocity on the angular coordinates.

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Additional Information:© 2014 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2014 July 22. Received 2014 May 25; in original form 2014 February 11. First published online August 27, 2014. This research was partially supported by the Volkswagen Stiftung (Grant 86 866). We would like to thank Luciano Rezzolla for support, as well as Farruh Atamurotov for important discussions. VM thanks Christian Ott for hospitality at Caltech. BA’s research is supported in part by the project F2-FA-F113 of the UzAS and by the ICTP through the OEA-NET-76, OEA-PRJ-29 projects. OZ acknowledges support to the European Research Council under the European Union’s Seventh Framework Programme (FP7/2007- 2013) in the frame of the research project STiMulUs, ERC Grant agreement no. 278267. We would like to thank our referee for very valuable comments, which helped us to improve the quality of the manuscript.
Funding AgencyGrant Number
Volkswagen Stiftung86 866
European Research Council (European Union)278267
Subject Keywords:stars: neutron – pulsars: general – pulsars: individual: B0826-34, B0818-41
Issue or Number:2
Record Number:CaltechAUTHORS:20141106-125403337
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Official Citation:Viktoriya S. Morozova, Bobomurat J. Ahmedov, and Olindo Zanotti Explaining the subpulse drift velocity of pulsar magnetosphere within the space-charge limited flow model MNRAS (October 21, 2014) Vol. 444 1144-1156 doi:10.1093/mnras/stu1486 First published online August 27, 2014
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:51374
Deposited By: Tony Diaz
Deposited On:06 Nov 2014 21:38
Last Modified:10 Nov 2021 19:09

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