Galaxy counts as a cosmological test

Details Galaxy counts as a cosmological test Galaxy counts as a cosmological test

Dec 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974apj...194..555b&link_type=abstract

Astrophysical Journal, vol. 194, Dec. 15, 1974, pt. 1, p. 555-558.

Mathematics

Logic

32

Astronomical Models, Cosmology, Galactic Evolution, Luminosity, Absorption Spectra, Astronomical Catalogs, Intergalactic Media, Red Shift, Spiral Galaxies

Scientific paper

Analytical approximations and numerical calculations are given for the number-magnitude relation for galaxies. It is shown that this relation is no more sensitive to the cosmological model (in particular, to the value of q0 in the standard Friedmann models without cosmological constant) than to effects of galactic evolution and possible intergalactic absorption. Counts are expected to be dominated by spiral galaxies. The number-magnitude relation is thus not a straightforward cosmological test, since its interpretation will require a good knowledge of the luminosity functions, spectra, and evolution of all types of galaxies.

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