The Analysis of the Possible Thermal Emission at Radio Frequencies from Supernova Remnants G39.2-0.3 (3C396) and G156.2+5.7

Details The Analysis of the Possible Thermal Emission at Radio Frequencies from Supernova Remnants G39.2-0.3 (3C396) and G156.2+5.7 The Analysis of the Possible Thermal Emission at Radio Frequencies from Supernova Remnants G39.2-0.3 (3C396) and G156.2+5.7

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009pobeo..86...95o&link_type=abstract

Publications of the Astronomical Observatory of Belgrade, vol. 86, pp. 95-100

Astronomy and Astrophysics

Astronomy

Scientific paper

The presence of thermal emission at radio frequencies (10 MHz-100 GHz) may be a useful tool for identifying interactions between supernova remnants (SNRs) and molecular clouds, and also for estimating the ambient density near SNRs by using only radio continuum data. In this paper possible thermal emission at radio frequencies from Galactic SNRs G39.2-0.3 (3C396) and G156.2+5.7 is analyzed. A model including the sum of non-thermal (purely synchrotron) and thermal (bremsstrahlung) component is applied to fit the integrated radio spectrum of the SNR. For SNR 3C396 the contribution of thermal component to the total volume emissivity at 1 GHz is estimated to be 47.6 per cent. Our ambient density estimates can support the hypothesis that the SNR is embedded in the dense molecular cloud material. In the case of the SNR G156.2+5.7, the available flux density values at only four different radio frequencies are insufficient for a detailed statistical analysis. Despite the inability to get firmer conclusions about contribution of thermal component to the total volume emissivity we calculated its value to be 31.5 per cent and estimated the average ambient density.

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