Distances to Supernova Remnants G31.9+0.0 and G54.4−0.3 Associated with Molecular Clouds

New distances to the supernova remnants (SNRs) G31.9+0.0 and G54.4−0.3 have been found. The analysis method uses H i absorption spectra and CO channel maps. Individual H i channel maps are used to verify absorption features in the H i absorption spectrum or to determine if they have noise. Both of t...

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Bibliographic Details
Published in:The Astrophysical journal 2017-07, Vol.843 (2), p.119
Main Authors: Ranasinghe, S., Leahy, D. A.
Format: Article
Language:English
Subjects:
ABSORPTION
ABSORPTION SPECTRA
Astrophysics
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
CARBON MONOXIDE
CLOUDS
HYDROGEN
ISM: individual objects (G31.9+0.0, G54.4−0.3)
ISM: supernova remnants
Kinematics
Molecular clouds
NOISE
SPECTRA
Supernova
SUPERNOVA REMNANTS
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Summary:New distances to the supernova remnants (SNRs) G31.9+0.0 and G54.4−0.3 have been found. The analysis method uses H i absorption spectra and CO channel maps. Individual H i channel maps are used to verify absorption features in the H i absorption spectrum or to determine if they have noise. Both of the SNRs are associated with molecular clouds so accurate kinematic velocities are determined. The H iabsorption is used to resolve the kinematic distance ambiguity. The resulting new distance for G31.9+0.0 is 7.1 0.4 kpc and for G54.4−0.3 it is 6.6 0.6 kpc. These are significant revisions to the previous values.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/aa7894