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

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 enough. In this work we therefore revised the analysis of the possible thermal emission at radio frequencies from this SNR using the recently published, corrected flux density values. A model including the sum of non-thermal (purely synchrotron) and thermal (bremsstrahlung) components is applied to fit the integrated radio spectrum of this SNR. The contribution of thermal component to the total volume emissivity at 1 GHz is estimated to be ? 37%. The ambient density is also estimated to be n ? 9 cm-3 for T = 104 K. Again we obtained a relatively significant presence of thermal emission at radio frequencies from the SNR, which can support interaction between SNR HB 3 and adjacent molecular cloud associated with the H ii region W3. Our model estimates for thermal component contribution to total volume emissivity at 1 GHz and ambient density are similar to those obtained earlier (? 40 %, ? 10 cm-3 ). It is thus obvious that the corrected flux density values do not affect the basic conclusions. Nedavno je ustanovljeno da su neke od vrednosti gustina fluksa evoluiranog ostatka supernove (OSN) HB 3 (G132.7+1.3) netacne. U ovom radu smo ponovili analizu mogu e termalne radio-emisije OSN HB 3 koriste i korigovane vrednosti gustina fluksa. Model koji pretpostavlja sumu netermalne i termalne komponente primenjen je za fitovanje radio-spektra ostatka. Ucesce termalne komponente u ukupnoj zapreminskoj emisivnosti na 1 GHz je procenjeno na ? 37 %. Gustina okolne sredine je takodje procenjena na n ? 9 cm-3 za T = 104 K. Ponovo je, dakle, nadjeno znacajno prisustvo termalne komponente u ukupnoj zapreminskoj emisivnosti, tako da mozemo da podrzimo hipotezu o interakciji izmedju ostatka i molekularnog oblaka. Procene prisustva termalne komponente u ukupnoj zapreminskoj emisivnosti na 1 GHz i gustine okolne sredine su slicne sa ranije odredjenim (? 40 %, ? 10 cm-3 ). Jasno je da vrednosti korigovanih gustina fluksa ne menjaju osnovne zakljucke ovog rada.