Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89.1124e&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, Aug. 1984, p. 1124-1154. Research supported by the South African Council for Sci
Astronomy and Astrophysics
Astrophysics
23
Astrometry, Big Bang Cosmology, Galaxies, Brightness, Distance, Galactic Clusters, Luminosity, Point Spread Functions, Set Theory
Scientific paper
The theoretical foundations of established methods using astronomical observations of distant astronomical sources to determine the structure of the universe are reviewed. The authors give a general description of the relation between source and image properties, and apply it specifically to optical observations of galaxies. The concept of the observational map is developed and illustrated for well-defined families of galaxies for which the authors map source intrinsic magnitude and size onto the image apparent magnitude and angle. The properties of the resulting map, which is highly nonlinear, depend critically on the limiting surface brightness and point-spread characteristics of the particular observation. Using these maps as a basis, the authors discuss the nature and effects of several important selection effects.
Ellis George F. R.
Perry Jonathan
Sievers A. W.
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