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Nanoarcsecond Single-Dish Imaging of the Vela Pulsar

Published online by Cambridge University Press:  12 April 2016

J.-P. Macquart ,
S. Johnston ,
M. Walker  and
D. Stinebring
J.-P. Macquart
Affiliation:
Special Research Centre for Theoretical Astrophysics, School of Physics, University of Sydney, New South Wales 2006, Australia
S. Johnston
Affiliation:
Special Research Centre for Theoretical Astrophysics, School of Physics, University of Sydney, New South Wales 2006, Australia
M. Walker
Affiliation:
Special Research Centre for Theoretical Astrophysics, School of Physics, University of Sydney, New South Wales 2006, Australia
D. Stinebring
Affiliation:
Department of Physics, Oberlin College, Oberlin, OH 44074

Abstract

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We have measured the properties of the diffractive scintillation toward the Vela pulsar under the extremely strong scattering conditions encountered at 660 MHz. We obtain a decorrelation bandwidth of vd = 244±4 Hz and diffractive decorrelation timescale of tdiff = 3.3±0.3s. Our measurement of the modulation indices m = 0.87±0.003±0.05 and m = 0.93±0.03±0.05 (one For each polarization stream), are at variance with the modulation index of the Vela pulsar obtained at 2.3 GHz by Gwinn et al. (F997) if the deviation from a modulation index of unity is ascribed to a source size effect.

Type
Part 3. Studies of Radio Emission
Information
International Astronomical Union Colloquium , Volume 177: Pulsar Astronomy - 2000 and Beyond , 2000 , pp. 215 - 218
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

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