Astronomy and Astrophysics – Astronomy
Scientific paper
May 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244....8d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 1, 1990, p. 8-24.
Astronomy and Astrophysics
Astronomy
61
Disk Galaxies, Elliptical Galaxies, Galactic Bulge, Galactic Structure, Visible Spectrum, Absorption Spectra, Brightness Distribution, Galactic Clusters, Galactic Evolution, Universe
Scientific paper
The visibility of inclined, two-component bulge/disk galaxies is considered. It is found that the visibility function is a sharply peaked function of the intrinsic central surface brightness of the disk, the peak of the distribution closely corresponding with the peak predicted for a face-on disk. It is shown that a characteristic surface brightness can be defined for a given catalog. Sample visibility curves are given for various galaxy selection criteria, galaxy parameters, and detector dynamic ranges. The visibility of early-type galaxies is found to be less than that of late types, so the bulge/elliptical luminosity of the universe may have been underestimated previously. The strong influence of even a small bulge component on the extrapolated value of the disk central surface brightness, along with arguments about visibility, are shown to produce a very narrow surface brightness distribution in close agreement with observational data.
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