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Dust-to-gas ratio in the outer regions of spiral galaxies (1980)

Jura, M.

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Publication Date: 2011-08-18

Description: Some spiral galaxies are surrounded by extended clouds of neutral hydrogen; if dust is associated with this gas, the dust should appear as a faint extended reflection nebula illuminated by the light from the entire galaxy. It is suggested that observations of the surface brightness of the outer regions of M83 and M101 could be worthwhile, since these two galaxies are bright and have extended surrounding gas clouds. Such studies would be of interest with regard to the possible presence of faint extended halos of stars around galaxies, the extent of the metallicity gradients in galaxies, and the value of the dust-to-gas ratio in quasar absorption-line systems.

Keywords: ASTROPHYSICS

Type: Astrophysical Journal; vol. 241

Format: text

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