The mass function from local density maxima - Groups and clusters of galaxies

Details The mass function from local density maxima - Groups and clusters of galaxies The mass function from local density maxima - Groups and clusters of galaxies

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345....3c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 1, 1989, p. 3-11.

Statistics

Computation

45

Computational Astrophysics, Cosmology, Density Distribution, Galactic Clusters, Mass Distribution, Dark Matter, Galactic Evolution, Luminosity, Mass To Light Ratios

Scientific paper

The mass function of galaxy systems in a cold dark matter cosmogony is considered with the peak constraint that proto-objects form around local density maxima. Different possible definitions of peak mass are analyzed to test their reliability down to the low-mass tail. The effects of non-Gaussian features on the distribution of primordial fluctuations are also discussed. A prediction of the model is the time evolution of the luminosity function and the characteristic mass: a self-similar evolution provides a fairly accurate description even at moderate redshifts. The resulting mass multiplicity, within a biased cold dark matter model with Gaussian, scale-invariant (n = 1), adiabatic primordial perturbations, provides a fit of the existing data on the optical luminosity function for groups and clusters of galaxies.

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