Saha, Preetha ; Bharadwaj, Somnath ; Roy, Nirupam ; Choudhuri, Samir ; Chattopadhyay, Debatri (2019) A study of Kepler supernova remnant: angular power spectrum estimation from radio frequency data Monthly Notices of the Royal Astronomical Society, 489 (4). pp. 5866-5875. ISSN 0035-8711
Full text not available from this repository.
Official URL: http://doi.org/10.1093/mnras/stz2528
Related URL: http://dx.doi.org/10.1093/mnras/stz2528
Abstract
Supernova remnants (SNRs) have a variety of overall morphology as well as rich structures over a wide range of scales. Quantitative study of these structures can potentially reveal fluctuations of density and magnetic field originating from the interaction with ambient medium and turbulence in the expanding ejecta. We have used 1.5 GHz (L band) and 5 GHz (C band) VLA data to estimate the angular power spectrum Cℓ of the synchrotron emission fluctuations of the Kepler SNR. This is done using the novel, visibility-based, Tapered Gridded Estimator of Cℓ. We have found that, for ℓ = (1.9–6.9) × 104, the power spectrum is a broken power law with a break at ℓ = 3.3 × 104, and power-law index of −2.84 ± 0.07 and −4.39 ± 0.04 before and after the break, respectively. The slope −2.84 is consistent with 2D Kolmogorov turbulence and earlier measurements for the Tycho SNR. We interpret the break to be related to the shell thickness of the SNR (0.35 pc) which approximately matches ℓ = 3.3 × 104 (i.e. 0.48 pc). However, for ℓ > 6.9 × 104, the estimated Cℓ of L band is likely to have dominant contribution from the foregrounds while for C band the power-law slope −3.07 ± 0.02 is roughly consistent with 3D Kolmogorov turbulence like that observed at large ℓ for Cas A and Crab SNRs.
Item Type: | Article |
---|---|
Source: | Copyright of this article belongs to The Royal Astronomical Society. |
Keywords: | ISM: Supernova Remnants; ISM: Individual: Kepler SNR; Methods: Statistical; Turbulence, MHD. |
ID Code: | 116270 |
Deposited On: | 09 Apr 2021 04:02 |
Last Modified: | 09 Apr 2021 04:02 |
Repository Staff Only: item control page