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Correlation Between X-Ray Light-Curve Shape and Radio Arrival Time in the Vela Pulsar

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Lommen, AN and Donovan, J and Gwinn, C and Arzoumanian, Z and Harding, A and Strickman, M and Dodson, R and McCulloch, PM and Moffett, D (2007) Correlation Between X-Ray Light-Curve Shape and Radio Arrival Time in the Vela Pulsar. The Astrophysical Journal, 657 (1). pp. 436-440. ISSN 0004-637X

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Abstract

We report the results of simultaneous observations of the Vela pulsar in X-rays and radio from the RXTE satellite
and the Mount Pleasant Radio Observatory in Tasmania.We sought correlations between Vela’s X-ray emission and
radio arrival times on a pulse-by-pulse basis. At a confidence level of 99.8% we have found significantly higher flux
density in Vela’s main X-ray peak during radio pulses that arrived early. This excess flux shifts to the ‘‘trough’’ following
the second X-ray peak during radio pulses that arrive later. Our results suggest that the mechanism producing
the radio pulses is intimately connected to the mechanism producing X-rays. Current models using resonant absorption
of radio emission in the outer magnetosphere as a cause of the X-ray emission are explored as a possible explanation
for the correlation.

Item Type: Article
Journal or Publication Title: The Astrophysical Journal
Publisher: University of Chicago Press
Page Range: pp. 436-440
ISSN: 0004-637X
Identification Number - DOI: 10.1086/510797
Date Deposited: 07 Apr 2008 14:04
Last Modified: 18 Nov 2014 03:33
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