Biasing and distribution functions for different galaxy types in optical and IRAS catalogs

Details Biasing and distribution functions for different galaxy types in optical and IRAS catalogs Biasing and distribution functions for different galaxy types in optical and IRAS catalogs

Sep 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...396..430l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 396, no. 2, Sept. 10, 1992, p. 430-444. Research supported by Virginia Inst

Astronomy and Astrophysics

Astrophysics

45

Astronomical Catalogs, Galactic Structure, Spatial Distribution, Galactic Clusters, Galactic Mass, Many Body Problem, Red Shift

Scientific paper

A simple general objective method for determining the distribution functions (counts in cells) of biased subsamples is described. This method does not depend on any specific definition of a 'cluster'. Applying this to morphological subsets of the UGC and ESO catalogs, and to the IRAS catalog, quantifies the excess clustering of early-type E + S0 galaxies relative to Sa + Sb spirals. Spirals are distributed nearly randomly, while the average probability of finding an elliptical in a region containing M galaxies is about M exp 0.3. If the present galaxy distribution is similar to the distribution when stripping and merging occurred, then these processes do not account for the observed morphology-density relation of ellipticals and spirals. Models in which stripping or merging occurred at high redshifts are constrained by the requirement that they evolve into the presently observed distribution functions of ellipticals and spirals, which are consistent with simple gravitational clustering.

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