Statistics – Computation
Scientific paper
Jun 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...329...24l&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 329, June 1, 1988, p. 24-37. NSF-supported research.
Statistics
Computation
16
Cosmology, Elliptical Galaxies, Hubble Constant, Red Shift, Computational Astrophysics, Universe
Scientific paper
This paper discusses a measurement of volume as a function of redshift, which has been used to determine bounds on the cosmological density parameter Ω and dimensionless form λ of the cosmological constant. The basic data are redshifts and fluxes of a complete, magnitude-limited catalog of galaxies in several small areas of the sky; the median redshift of the sample is 0.5. These data and a measurement of the local density of bright galaxies determine the volume element (to a factor of H03) as a function of redshift. The Ansatz that the shape of the Schechter luminosity function and the comoving density of galaxies are unchanging is used to derive the volume element from the observed number of galaxies. The author describes some parameterizations of evolution and their bearing on the measurement of Ω. He addresses also the issue of whether systematic effects can make an Ω = 0 universe alias as Ω = 1.
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