Massive superclusters as a probe of the nature and amplitude of primordial density fluctuations

Details Massive superclusters as a probe of the nature and amplitude of primordial density fluctuations Massive superclusters as a probe of the nature and amplitude of primordial density fluctuations

Oct 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...297..365k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 297, Oct. 15, 1985, p. 365-370. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

30

Astronomical Models, Galactic Clusters, Interstellar Matter, Molecular Clouds, Space Density, Dark Matter, Mass Distribution, Normal Density Functions, Universe

Scientific paper

It is pointed out that correlation studies of galaxy positions have been widely used in the search for information about the large-scale matter distribution. The study of rare condensations on large scales provides an approach to extend the existing knowledge of large-scale structure into the weakly clustered regime. Shane (1975) provides a description of several apparent massive condensations within the Shane-Wirtanen catalog, taking into account the Serpens-Virgo cloud and the Corona cloud. In the present study, a description is given of a model for estimating the frequency of condensations which evolve from initially Gaussian fluctuations. This model is applied to the Corona cloud to estimate its 'rareness' and thereby estimate the rms density contrast on this mass scale. An attempt is made to find a conflict between the density fluctuations derived from the Corona cloud and independent constraints. A comparison is conducted of the estimate and the density fluctuations predicted to arise in a universe dominated by cold dark matter.

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