Cooperative galaxy formation and large-scale structure

Details Cooperative galaxy formation and large-scale structure Cooperative galaxy formation and large-scale structure

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...405..403b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 405, no. 2, p. 403-412.

Astronomy and Astrophysics

Astrophysics

82

Cosmology, Dark Matter, Density (Mass/Volume), Galactic Clusters, Galactic Evolution, Mass Distribution, Luminosity, Mathematical Models

Scientific paper

We consider a model in which galaxy formation occurs at high peaks of the mass density field, as in the standard picture for biased galaxy formation, but is further enhanced by the presence of nearby galaxies. This modification is accomplished by assuming the threshold for galaxy formation to be modulated by large-scale density fluctuations rather than to be spatially invariant. We show that even a weak modulation can produce significant large-scale clustering. In a universe dominated by cold dark matter, a 2 percent - 3 percent modulation on a scale exceeding 10/h Mpc produces enough additional clustering to fit the angular correlation function of the APM galaxy survey. We discuss several astrophysical mechanisms for which there are observational indications that cooperative effects could occur on the scale required.

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