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Interstellar Fringes from PSR B0834+06

Published online by Cambridge University Press:  12 April 2016

Barney Rickett ,
Andrew Lyne  and
Yashwant Gupta
Barney Rickett
Affiliation:
University of California, San Diego, CA 92093-0407, USA
Andrew Lyne
Affiliation:
University of Manchester, Nuffield Radio Astronomy Laboratories, Jodrell Bank, Macclesfield, SK11 9DL
Yashwant Gupta
Affiliation:
National Centre for Radio Astrophysics, TIFR, Post Bag 3, Ganeshkhind, Pune 411 007, India

Extract

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The spectra of radio flux from pulsars show deep modulations, over a typical time scale Δtd and frequency scale Δfd. These random diffractive interstellar scintillations are caused by inhomogeneities in the interstellar plasma on scales of 105m to 106m; on occasion there are also refractive modulations caused by very much larger scales. We report here an episode of periodic modulations of the dynamic spectrum of PSR B0834+06 seen in the sequence of observations centered at 408 MHz reported by Gupta et al. (1994 - GRL). There were 12 observations of about 2 hours covering 5 MHz spaced over 14 months. An episode of very fine periodic fringes was detected, though the period 45 kHz in frequency was barely resolved by the 19.5 kHz channel bandwiths; the period in time was about 5 minutes and was fully resolved. The normal Δfd was about 4 MHz (GRL) - ≈90 times the fringe period.

Type
Part 6 Winds and the ISM
Information
International Astronomical Union Colloquium , Volume 160: Pulsars: Problems and Progress , 1996 , pp. 471 - 472
Copyright
Copyright © Astronomical Society of the Pacific 1996

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