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Astron. Astrophys. 356, 1136-1140 (2000)

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Post-glitch RXTE-PCA observations of the Vela pulsar

M.A. Gürkan  *  1, A. Baykal 1, M.A. Alpar  **  1, H.B. Ögelman 2 and T. Strohmayer 3

1 Middle East Technical University, Physics Department, 06531, Ankara, Turkey
2 Department of Physics, University of Wisconsin, 1150 University Avenue, Madison, WI 53706, USA
3 NASA, Goddard Space Flight Center, Greenbelt, MD 20771, USA

Received 18 August 1999 / Accepted 25 February 2000

Abstract

We report the results of analysis of observations of the Vela Pulsar by PCA on RXTE. Our data consists of two parts. The first part contains observations at 1, 4, and 9 days after the glitch in 1996 and has 27000 sec. total exposure time. The second part of observations were performed three months after this glitch and have a total exposure time of 93000 sec. We found pulsations in both sets. The observed spectrum is a power-law with no apparent change in flux or count rate. The theoretical expectations of increase in flux due to internal heating after a glitch are smaller than the uncertainty of the observations.

Key words: radiation mechanisms: non-thermal – radiation mechanisms: thermal – stars: pulsars: individual: Vela

* Present address: Northwestern University, Department of Physics and Astronomy, 2145 Sheridan Road, Evanston, IL 60208, USA
** Present address: Faculty of Sciences and Engineering, Sabanc University, Karaköy, Istanbul, Turkey

Send offprint requests to: A. Gürkan

Correspondence to: A. Gürkan (ato@nwu.edu)

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© European Southern Observatory (ESO) 2000

Online publication: April 17, 2000
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