Other
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.229..505p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 229, Dec. 1, 1987, p. 505-515.
Other
59
Astronomical Spectroscopy, Brightness Distribution, Galactic Clusters, Surface Properties
Scientific paper
A survey of a complete sample of galaxies in the region of the Fornax cluster is presented. Measurements with the APM machine are used to derive the observed distribution of galaxy surface brightness for 1550 objects. Corrections for surface brightness-dependent selection effects are then made in order to estimate the true distribution. The sample is divided into two distinct populations. The 'normal' galaxies with extrapolated central surface brightness form a uniformly distributed background of field galaxies. Their surface brightness distribution peaks at S(x) = 21.75 B-micron and has a width of about 2 mag. Low surface brightness galaxies (S(x) of less than about 22.5 B-micron), on the other hand, are strongly clumped about the cluster center. There appear to be few low surface brightness field galaxies. The central surface brightness distribution for these cluster galaxies is essentially flat in the accessible range 22.5-24.2 B-micron and their numbers rise rapidly towards faint magnitudes (for a distance modulus of 31.0 for Fornax, the absolute magnitude range studied is from -14.4 to -11.9).
Cawson G. M. M.
Disney Michael J.
Kibblewhite Edward J.
Phillipps Steve
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