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Study of the LISM Using Pulsar Scintillation

Published online by Cambridge University Press:  12 April 2016

N.D.R. Bhat ,
Y. Gupta  and
A.P. Rao
N.D.R. Bhat
Affiliation:
National Centre for Radio Astrophysics (TIFR), Pune 411 007, India.
Y. Gupta
Affiliation:
National Centre for Radio Astrophysics (TIFR), Pune 411 007, India.
A.P. Rao
Affiliation:
National Centre for Radio Astrophysics (TIFR), Pune 411 007, India.

Abstract

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We present here the results from an extensive scintillation study of twenty pulsars in the dispersion measure (DM) range 3 – 35 pc cm−3 carried out using the Ooty Radio Telescope, to investigate the distribution of ionized material in the local interstellar medium (LISM). Our analysis reveals several anomalies in the scattering strength, which suggest that the distribution of scattering material in the solar neighborhood is not uniform. Our model suggests the presence of a low density bubble surrounded by a shell of much higher density fluctuations. We are able to put some constraints on geometrical and scattering properties of such a structure, and find it to be morphologically similar to the local bubble known from other studies.

Type
Part IV Clouds, Ionized Gas, and Particles in the Local ISM
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 211 - 214
Copyright
Copyright © Springer-Verlag 1998

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