Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...227...67a&link_type=abstract
Astrophysical Journal, Part 1, vol. 227, Jan. 1, 1979, p. 67-72. Research supported by the National Science Foundation of Nethe
Astronomy and Astrophysics
Astrophysics
59
Astronomical Photometry, Brightness, Galactic Structure, Luminous Intensity, Elliptical Galaxies, Isophotes, Luminosity, Spiral Galaxies
Scientific paper
Disney's (1976) suggestion is reexamined that selection effects dominate Fish's (1964) law concerning the potential energy-mass relation for elliptical galaxies and Freeman's (1970) law concerning the extrapolated central surface brightness of disk galaxies. It is found that selection effects may indeed have influenced the samples discussed by Fish and Freeman, but not in the sense described by Disney. In particular, it is argued that the data set does not show a bias toward large galaxies, but there is a bias against the faint end of the distribution of central surface brightnesses. It is therefore suggested that the observed paucity of ellipticals and spirals with very high extrapolated central surface brightnesses is probably real. Hence Fish's and Freeman's laws should be reformulated to state that very few elliptical and spiral galaxies have extrapolated central isophotes in B which are brighter than, respectively, 12.0 mag per square arcsec and 19.5 mag per square arcsec.
Allen Rosalind J.
Shu Frank H.
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