Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173...59v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 1, Feb. 1987, p. 59-80.
Astronomy and Astrophysics
Astrophysics
230
Brightness Distribution, Disk Galaxies, Galactic Radiation, Radial Distribution, Data Reduction, Star Distribution, Virgo Galactic Cluster
Scientific paper
The major conclusions from this paper are as follows: (1) A sample of spiral galaxies that is complete to a diameter of 2arcmin at the apparent isophote of 26.5 J-mag arcsec-2 has a narrow distribution of central surface brightness with μ0 = 21.8±0.6 J-mag arcsec-2 (mean and standard deviation). This is not produced by sample selection effects. (2) The bivariate distribution function of μ0 and scalelength h shows that the mean value of μ0 changes from about 21.5 at h ≡ 5 kpc to about 22 - 22.5 at h ≡ 1 kpc. The most abundant galaxy in the universe has μ0 ≡ 22.5 J-mag arcsec-2 and h ≡ 1 kpc. (3) The small spread in μ0 in the universe is probably a result of a constant ratio of visible to dark matter in all galaxies, if galaxies collapse with detailed conservation of angular momentum from uniformly rotating, uniform spheres that derive their angular momentum from tidal torques in a universe with hierarchical clustering. This model also explains the approximate exponential nature and the cut-offs in the stellar disk at about 4.5 scalelengths.
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