Published in "The Minnesota lectures on clusters of galaxies and large-scale structure". San Francisco, CA, Astronomical Society of the Pacific, 1988, p. 19-39.

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THE CLUSTERING OF LIGHT AND OF MASS

AUGUSTUS OEMLER, JR.


Yale University Observatory, P.O. Box 6666, New Haven, CT 06511


Abstract. Contradictions between cosmological theory and observations are greatly eased if luminous galaxies are not reliable tracers of the distribution of mass. However, an analysis of existing data suggests that light and mass do have the same distribution on scales larger than about one hundred kiloparsecs. This implies that the cosmic density parameter, Omega appeq 0.15, and that baryons probably dominate the mass of the universe.


Table of Contents

INTRODUCTION

GENESIS OF THE IDEA
Missing Mass in Galaxies
The Cosmological Context
Theoretical Difficulties
A Way Out

MECHANISMS OF LUMINOSITY-MASS SEGREGATION

OBSERVATIONAL TESTS
Tests of Biased Galaxy Formation

DISCUSSION

REFERENCES

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