Hostname: page-component-54dcc4c588-dbm8p Total loading time: 0 Render date: 2025-09-23T08:39:22.051Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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.

Information

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

Armstrong, J.W., Rickett, B.J., Spangler, S.R., 1995, ApJ, 443, 209 CrossRefGoogle Scholar
Gwinn, C.R. et al, 1997, ApJ, 483, L53 Google Scholar
Gwinn, C.R. et al., 1998, ApJ, 505, 928 Google Scholar
Gwinn, C.R. et al., 1999, ApJ, in press.Google Scholar
Johnston, S., Nicastro, L., Koribalski, B., 1998, MNRAS, 297, 108 CrossRefGoogle Scholar
Macquart, J.-P., Johnston, S., Walker, M.A., Stinebring, D.R., 2000, ApJ, submitted.Google Scholar