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A Very Rapid Extreme Scattering Event in the IDV Source 0954+658

Published online by Cambridge University Press:  05 March 2013

Giuseppe Cimò ,
T. Beckert ,
T. P. Krichbaum ,
L. Fuhrmann ,
A. Kraus ,
A. Witzel  and
J. A. Zensus
Giuseppe Cimò*
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, Germany
T. Beckert
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, Germany
T. P. Krichbaum
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, Germany
L. Fuhrmann
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, Germany
A. Kraus
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, Germany
A. Witzel
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, Germany
J. A. Zensus
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, Bonn, Germany
*
[email protected]
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Abstract

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Extreme scattering events (ESEs) are dramatic variations of the flux density at gigahertz frequencies caused by ray path distortions within an isolated inhomogeneity (‘plasma lens’) in the interstellar medium. These events are characterised by a deep flux density minimum in the light curve with, in some cases, surrounding maxima. The variability time scales range from weeks to months. These phenomena show a strong frequency dependence, in which the variability amplitudes increase with wavelength. During an intraday variability (IDV) monitoring project (March 2000), a feature resembling an ESE-like event appeared in the variable light curve of 0954+658, however with a time scale of less than two days. We will discuss this effect and its implications for a better description of the interstellar medium.

Keywords

quasars: individual (0954+658)ISM: structure
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 19 , Issue 1 , 2002 , pp. 10 - 13
Copyright
Copyright © Astronomical Society of Australia 2002

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