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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
Authors/Creators:	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
Journal or Publication Title:	The Astrophysical Journal
Publisher:	University of Chicago Press
ISSN:	0004-637X
DOI / ID Number:	10.1086/510797
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