Pulsar Observations and Structure of the Local ISM

Details Pulsar Observations and Structure of the Local ISM Pulsar Observations and Structure of the Local ISM

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001ap%26ss.276..227r&link_type=abstract

Astrophysics and Space Science, v. 276, Issue 1, p. 227-231 (2001).

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

Results from new observations of pulsars using the Ooty Radio Telescope (ORT) are used for investigating the structure of the Local Interstellar Medium (LISM) and the nature of the plasma turbulence spectrum in the Interstellar Medium (ISM). The observations show anomalous scintillation towards several nearby pulsars, and these are modelled in terms of large-scale spatial inhomogeneities in the distribution of plasma density fluctuations in the LISM. A 3-component model, where the Solar neighborhood is surrounded by a shell of enhanced plasma turbulence, is proposed for the LISM. The inferred scattering structure is strikingly similar to the Local Bubble. The nature of the plasma turbulence spectrum is found to be Kolmogorov-like in the spatial scale range ~ 10^6 m to ~ 10^11 m, and there is evidence for excess power at larger spatial scales.

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