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 $\approx37 %$. 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 ($\approx40 %$, $\approx10 \mathrm{ cm^{ -3}}$). It is clear that the corrected flux density values do not change the basic conclusions.

Categories: astro-ph

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