The area of isodensity contours in cosmological models and galaxy surveys

Details The area of isodensity contours in cosmological models and galaxy surveys The area of isodensity contours in cosmological models and galaxy surveys

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..647r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 340, May 15, 1989, p. 647-660.

Astronomy and Astrophysics

Astrophysics

35

Cosmology, Galactic Clusters, Dark Matter, Density Distribution, Gravitational Effects, Red Shift

Scientific paper

The contour crossing statistic, defined as the mean number of times per unit length that a straight line drawn through the field crosses a given contour, is applied to model density fields and to smoothed samples of galaxies. Models in which the matter is in a bubble structure, in a filamentary net, or in clusters can be distinguished from Gaussian density distributions. The shape of the contour crossing curve in the initially Gaussian fields considered remains Gaussian after gravitational evolution and biasing, as long as the smoothing length is longer than the mass correlation length. With a smoothing length of 5/h Mpc, models containing cosmic strings are indistinguishable from Gaussian distributions. Cosmic explosion models are significantly non-Gaussian, having a bubbly structure. Samples from the CfA survey and the Haynes and Giovanelli (1986) survey are more strongly non-Gaussian at a smoothing length of 6/h Mpc than any of the models examined. At a smoothing length of 12/h Mpc, the Haynes and Giovanelli sample appears Gaussian.

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