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Intensity Dependence of the PSR 0329+54 Pulse Profile
Published online by Cambridge University Press: 27 September 2017
Abstract
Following the analysis by Krishnamohan and Downs (1983) of the Vela pulsar, we have investigated the behavior of the core and outrider components of PSR 0329+54 by calculating pulse profiles at different pulse intensities. VLA observations of individual pulses from PSR 0329+54 at 1415 MHz were used in our analysis. Our investigation reveals the following dependencies upon increasing core peak intensity:
(i) earlier core arrival times,
(ii) decreasing separation of the left outrider relative to the core,
(iii) increasing separation of the right outrider relative to the core,
(iv) decreasing outrider-to-core peak intensity ratios, and
(v) essentially constant core width.
To explain these dependencies, we propose a simple model in which the location of the core centroid is altered near the neutron star surface. The model and data are consistent with the mode-switching signatures and magnetospheric absorption features known to exist in this pulsar.
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