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Mapping the Emission Location of the Crab Pulsar’s Giant Pulses

Published online by Cambridge University Press:  04 June 2018

Robert Main  and
Marten H. van Kerkwijk
Robert Main
Affiliation:
Department of Astronomy & Astrophysics, University of Toronto, 50 Saint George Street, Toronto, ON, M5S 3H4, Canada email: main,[email protected]
Marten H. van Kerkwijk
Affiliation:
Department of Astronomy & Astrophysics, University of Toronto, 50 Saint George Street, Toronto, ON, M5S 3H4, Canada email: main,[email protected]
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Abstract

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The Crab pulsar has a striking radio profile, dominated by two pulse components (the main pulse and interpulse) which are comprised of giant pulses. These pulses are randomly occurring, they extend to extremely high flux densities, and are closely aligned with emission across the entire electromagnetic spectrum. The Crab, like many pulsars, exhibits scintillation – a pattern in frequency and time arising from interfering scattered images. The pattern varies with location, with the physical scale over which it changes by order unity corresponding to the spatial resolution of the scattering surface. For the Crab, the scattering is in the nebula and the estimated spatial resolution is of order the light cylinder radius. Comparing scintillation spectra of the two components, we infer a difference in physical location of the same order.

Keywords

pulsars: individual (Crab)scatteringtechniques: interferometric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S337: Pulsar Astrophysics the Next Fifty Years , September 2017 , pp. 83
Copyright
Copyright © International Astronomical Union 2018 

References

Main, R., van Kerkwijk, M. H., Pen, U.-L., Rudnitskii, A. G., Popov, M. V., Soglasnov, V. A., & Lyutikov, M., 2017, ApJL, submitted (arXiv:1709.09179)Google Scholar