Other
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..585j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 15, 1984, p. 585-592.
Other
18
Absorption Spectra, Barred Galaxies, Interstellar Matter, Stellar Spectra, Supernovae, Halos, Red Shift, Signal To Noise Ratios
Scientific paper
It is pointed out that supernovae in other galaxies create spontaneous opportunities to probe spectroscopically the gaseous material in galactic halos. Because of their brightness, supernovae offer an unparalleled chance to obtain spectra with high wavelength resolution and/or signal-to-noise ratio. The present investigation is concerned with observations of visual interstellar lines in the spectrum of a supernova discovered on July 3, 1983, and identified as Type I. The supernova was located 124 arc sec south and 122 arc sec west of the nucleus of M83. Evidence is obtained that for velocities near that of M83, the line of sight toward the supernova contains a complex array of absorption features of Ca II. In both Ca II and Na I, the absorptions associated with M83 are far more prominent than those halfway through the disk (and halo) of the Milky Way Galaxy. It is felt that many of the displaced velocity components in the M83 system arise from a gaseous halo.
Harding Paul
Jenkins Edward B.
Morton Donald C.
Rodgers Alexander W.
York Don G.
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