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

Details Dust-to-gas ratio in the outer regions of spiral galaxies Dust-to-gas ratio in the outer regions of spiral galaxies

Nov 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...241..965j&link_type=abstract

Astrophysical Journal, Part 1, vol. 241, Nov. 1, 1980, p. 965-968. Research supported by the Alfred P. Sloan Foundation, NASA,

Astronomy and Astrophysics

Astrophysics

11

Cosmic Dust, Galactic Structure, Hydrogen Clouds, Interstellar Matter, Spiral Galaxies, Absorption Spectra, Halos, Interstellar Gas, Line Spectra, Optical Thickness

Scientific paper

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.

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