Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990pasp..102..503v&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 102, May 1990, p. 503-506.
Astronomy and Astrophysics
Astronomy
12
Cosmic Dust, Galactic Evolution, Gravitational Collapse, Irregular Galaxies, Luminosity, Spiral Galaxies, Ionization, Metallicity, Radiation Distribution, Radiation Pressure, Spectral Line Width, Virgo Galactic Cluster
Scientific paper
New CCD observations of nearby spiral and irregular galaxies show a strong correlation between dustiness and luminosity. This correlation probably results from the well-known relation between the luminosity of a galaxy and the metallicity of its interstellar gas. The results suggest that the protogalactic halo may have collapsed under essentially dust-free conditions. It is argued that dust probably started to form during the terminal phase of the collapse of the halo of M 31. The metallicities of stars contributing most of the light in giant ellipticals are so high that they were, almost certainly, formed in a dusty environment.
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