Mathematics – Logic
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...375..429c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 375, July 10, 1991, p. 429-431. NSERC-supported research.
Mathematics
Logic
17
Cosmology, Galactic Mass, Red Shift, Galactic Structure, Universe
Scientific paper
The fraction of galaxies which are merging is a rapidly increasing function of redshift, which for z less than about 0.5 varies as (1 + z)exp m, where m is quite sensitive to both the density parameter, Omega, and the cosmological constant, Lambda. The index m has weak dependencies on the details of the mass and structure of the merging galaxies but does depend on the rate at which the mean velocity dispersion of the universe grows with time; however, these parameters are strongly constrained by current epoch observations. The current estimates of m from a variety of astronomical sources gives m about 4.5 + or - 1. As a consequence, the current merger observations favor abs. value of Lambda less than about 1.5 H(0)-squared, Omega = 1 + or - 0.5, in a zero curvature universe. The merger data is marginally incompatible with Omega = 0.1 and any Lambda.
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