An analysis of the possible thermal emission at radio frequencies from an evolved supernova remnant HB 3 (G132.7 + 1.3): revisited

Abstract

It has recently been reported that some of the flux density values for an evolved supernova remnant (SNR) HB 3 (G132.7 + 1.3) are not accurate. In this work we revised an analysis of the possible thermal emission at radio frequencies from the SNR HB 3 using the recently published, corrected, flux density values. A model including a sum of non-thermal (purely synchrotron) and thermal (bremsstrahlung) component is applied for fitting integrated radio spectrum of the SNR. The contribution of thermal component in total volume emissivity at $1\mathrm{GHz}$ was estimated to be $\approx 37$. The ambient density was also estimated to be $n\approx 9{\mathrm{cm}}^{-3}$ for the $\mathrm{T}=10^4\mathrm{K}$. Again, we obtained the relatively significant presence of thermal emission at radio frequencies from the SNR so we could support interaction between SNR HB 3 and adjacent molecular cloud associated with the H {\sc ii} region W3. Our model estimates for thermal component contribution to total volume emissivity at $1\mathrm{GHz}$ and ambient density are similar to those obtained earlier ($\approx 40$, $\approx 10\mathrm{c}{\mathrm{m}}^{-3}$). It is clear that the corrected flux density values do not change the basic conclusions.

6 pages, 1 figure

References in corpus (2)

• The radio spectrum and magnetic field structure of SNR HB3
• An Analysis of the Broadband (22-3900 MHz) Radio Spectrum of HB3 (G132.7+1.3): The Detection of Thermal Radio Emission from an Evolved Supernova Remnant?

Cited by in corpus (1)

• On the radio spectra of supernova remnants