Turbulence in Cold Neutral ISM and in Supernova Remnants

Details Turbulence in Cold Neutral ISM and in Supernova Remnants Turbulence in Cold Neutral ISM and in Supernova Remnants

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aspc..407..272r&link_type=abstract

The Low-Frequency Radio Universe ASP Conference Series, Vol. 407, proceedings of the conference held 8-12 December 2008, at Nati

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present estimates of the intensity fluctuation power spectra of the synchrotron radiation intensity fluctuations at 6 and 20 cm for the Cas A and the Crab Nebula. It is found that the intensity fluctuations of both sources have a power law power spectrum with index -3.24 consistent with the magnetohydrodynamic turbulence in the synchrotron emitting plasma. For Cas A, due to the anisotropy of the perturbation at length scales larger than the shell thickness, there is a break in the power spectrum and the power law index changes from -3.2 to -2.2 at large angular scale. The H I opacity fluctuation power spectrum derived from the H I 21 cm absorption towards Cas A is also a scale free power law with index -2.7, consistent with the near-Kolmogorov turbulence in the diffuse interstellar medium.

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