New Distances to Four Supernova Remnants

TL;DR

This paper determines distances to four supernova remnants using H I spectra and channel maps, providing new measurements where none existed before, and finds no associated molecular gas for these remnants.

Contribution

The study introduces a method to measure distances to supernova remnants using H I absorption without prior distance data, expanding knowledge of their locations.

Findings

Distances to four SNRs were measured for the first time.

No molecular gas associated with the SNRs was detected.

Distances range from 3.5 to 9.0 kpc, with specified uncertainties.

Abstract

Distances are found for four supernova remnants without previous distance measurements. H I spectra and H I channel maps are used to determine the maximum velocity of H I absorption for the four supernova remnants (SNRs). We examined $^{13}$CO emission spectra and channel maps to look for possible molecular gas associated with each SNR, but did not find any. The resulting distances for the SNRs are $3.5 \pm 0.2$ kpc (G24.7+0.6), $4.7 \pm 0.3$ kpc (G29.6+0.1), $4.1 \pm 0.5$ kpc (G41.5+0.4) and $4.5 \pm 0 .4 - 9.0 \pm 0.4$ kpc (G57.2+0.8).