New high-frequency radio observations of the Cygnus Loop supernova remnant with the Italian radio telescopes
作者： S Loru , A Pellizzoni , E Egron , A Ingallinera , G Morlino
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摘要: Supernova remnants (SNRs) represent a powerful laboratory to study the Cosmic-Ray acceleration processes at shocks, and their relation properties of circumstellar medium. With aim studying high-frequency radio emission investigating energy distribution accelerated electrons magnetic field conditions, we performed single-dish observations large complex Cygnus Loop SNR from 7.0 24.8 GHz with Medicina Sardinia Radio Telescope, focusing on northern filament (NGC 6992) southern shell. Both regions show spectrum well fitted by power-law function ($S\propto\nu^{-\alpha}$), spectral index $\alpha=0.45\pm0.05$ for NGC 6992 $\alpha=0.49\pm0.01$ shell without any indication break. The spectra are significantly flatter than whole ($\alpha=0.54\pm0.01$), suggesting departure plain shock mechanisms, which could be related ongoing transition towards radiative shock. We model integrated considering evolution maximum amplification. Through parameters, infer 10 $\mu$G. This value is compatible pure adiabatic compression interstellar field, that amplification process currently inefficient.
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