Roy, Nirupam ; Bharadwaj, Somnath ; Dutta, Prasun ; Chengalur, Jayaram N. (2009) Magnetohydrodynamic turbulence in supernova remnants Monthly Notices of the Royal Astronomical Society, 393 (1). L26-L30. ISSN 0035-8711
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Official URL: http://onlinelibrary.wiley.com/doi/10.1111/j.1745-...
Related URL: http://dx.doi.org/10.1111/j.1745-3933.2008.00591.x
Abstract
We present estimates of the angular power spectra of the synchrotron radiation intensity fluctuations at 6 and 20 cm for the shell-type supernova remnant Cas A and the filled-centre Crab supernova remnant. We find that the intensity fluctuations of both the sources have a power-law power spectrum with index −3.24 ± 0.03. This power-law power spectrum is consistent with the magnetohydrodynamic turbulence in the synchrotron emitting plasma. For Cas A, there is a break in the power spectrum and the power-law index changes from −3.2 to −2.2 at large angular scale. This transition occurs at an angular scale that corresponds to the shell thickness of Cas A. We interpret this as a transition from three-to two-dimensional turbulence on scales that are, respectively, smaller and larger than the shell thickness.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to John Wiley and Sons. |
| Keywords: | MHD; Turbulence; ISM: General; ISM: Individual: Cas A; ISM: Individual: Crab Nebula; Supernova Remnants |
| ID Code: | 63566 |
| Deposited On: | 29 Sep 2011 04:10 |
| Last Modified: | 29 Sep 2011 04:10 |
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