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


Lommen, A and Donovan, J and Gwinn, C and Arzoumanian, Z and Harding, A and Strickman, M and Dodson, R and McCulloch, PM and Moffett, D, 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 (2007) [Refereed Article]

DOI: doi:10.1086/510797


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. © 2007. The American Astronomical Society. All rights reserved.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:McCulloch, PM (Professor Peter McCulloch)
ID Code:45698
Year Published:2007
Web of Science® Times Cited:10
Deposited By:Physics
Deposited On:2007-08-01
Last Modified:2009-12-02

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