Abstract
view Abstract Citations (24) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Optical surface brightnesses of dusty galaxies Jura, M. Abstract It is suggested that Freeman's (1970) result that the disk portions of spiral galaxies have a preferred central surface brightness might be the consequence of observing optically thick ensembles of a standard mix of stars and dust. Regardless of whether this hypothesis is correct, the observation that elliptical galaxies usually have central surface brightnesses considerably greater than the disk portions of spirals can be understood if there is much less dust within the elliptical systems. In particular, ellipticals probably have dust-to-total-mass ratios at least a factor of 100 smaller than in the disk portions of spirals, although there is no evidence that the dust-to-interstellar-gas ratios are different. When stars were forming within ellipticals, these galaxies were probably dustier than they are now, and their visible light output could have been substantially affected. It will probably be necessary to establish the dust content of galaxies as a function of redshift to use these objects as cosmological probes. Publication: The Astrophysical Journal Pub Date: June 1980 DOI: 10.1086/158005 Bibcode: 1980ApJ...238..499J Keywords: Brightness; Cosmic Dust; Elliptical Galaxies; Interstellar Matter; Light Emission; Spiral Galaxies; Cosmology; Red Shift; Surface Properties; Astrophysics full text sources ADS |
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