Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-11-14
Astrophys.J.657:436-440,2007
Astronomy and Astrophysics
Astrophysics
6 pages, 5 figures, accepted by ApJ
Scientific paper
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 the 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 2nd 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.
Arzoumanian Zaven
Dodson Richard
Donovan Jennifer
Gwinn Carl
Harding Albert
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