Publication Date:
2021-08-23
Description:
We present a systematic study of the supernova remnant (SNR) populations in the nearby galaxies NGC 45, NGC 55, NGC 1313, and NGC 7793 based on deep H $
m {alpha }$ and [S ii] imaging. We find 42 candidate and 51 possible candidate SNRs based on the [S ii]/H $
m {alpha }$〉0.4 criterion, 81 of which are new identifications. We derive the H $
m {alpha }$ and the joint [S ii]–H $
m {alpha }$ luminosity functions after accounting for incompleteness effects. We find that the H $
m {alpha }$ luminosity function of the overall sample is described with a skewed Gaussian with a mean equal to $
m log (L_{Halpha }/10^{36}, erg, s^{-1})=0.07$ and $
m sigma (log (L_{Halpha }/10^{36}, erg, s^{-1}))=0.58$. The joint [S ii]–H $
m {alpha }$ function is parametrized by a skewed Gaussian along the log([S ii]$
m /10^{36}, erg, s^{-1}) = 0.88 imes log (L_{Halpha }/10^{36}, erg, s^{-1}) - 0.06$ line and a truncated Gaussian with $
m mu (log (L_{[S, II]}/10^{36})) = 0.024$ and $
m sigma (log (L_{[S, II]}/10^{36})) = 0.14$, on its vertical direction. We also define the excitation function as the number density of SNRs as a function of their [S ii]/H $
m {alpha }$ ratios. This function is represented by a truncated Gaussian with a mean at −0.014. We find a sub-linear [S ii]–H $
m {alpha }$ relation indicating lower excitation for the more luminous objects.
Print ISSN:
0035-8711
Electronic ISSN:
1365-2966
Topics:
Physics
