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

Journal Article · Mon Jul 10 00:00:00 EDT 2017 · Astrophysical Journal

DOI:https://doi.org/10.3847/1538-4357/AA7894· OSTI ID:22663408

Ranasinghe, S.; Leahy, D. A. ^[1]

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1. Department of Physics and Astronomy, University of Calgary, Calgary, AB T2N 1N4 (Canada)

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.

• OSTI ID: 22663408
• Journal Information: Astrophysical Journal, Vol. 843, Issue 2; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
ABSORPTION
ABSORPTION SPECTRA
CARBON MONOXIDE
CLOUDS
HYDROGEN
NOISE
SPECTRA
SUPERNOVA REMNANTS