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Article Contents

ABSTRACT

1.INTRODUCTION

2. THE BARYON BUDGET AT z 0

2.1. Stars and Remnants in Galaxies

2.1.1. Luminosity Fractions

2.1.2. The Mean Luminosity Density

2.1.3. Mass-to-light Ratio of the Spheroid Component

2.1.4. Mass-to-Light Ratio of the Disk Component

2.1.5. Baryons in Stars and Remnants

2.2. Atomic and Molecular Gas

2.3. Baryons in Clusters of Galaxies

2.4. Baryons in Groups

2.4.1. Warm Plasma in Groups

2.4.2. Plasma in Cool Low Surface Density Clouds

2.4.3. Scaling from Clusters to Groups

2.5. Summary of the Low-Resolution Budget

2.6. Uncounted Components

2.6.1. Warm Plasma in the Voids

2.6.2. MACHOs

2.6.3. Dwarf Galaxies and Low Surface Brightness Galaxies

3. THE BARYON BUDGET AT z 3

4. NUCLEOSYNTHESIS

5. DISCUSSION

5.1. Comparison with Earlier Estimates

5.2. Observable and Unobservable Baryons

5.3. The Nucleosynthesis Check

5.4. The Check From the Budget at z 3

5.5. Concluding Remarks

REFERENCES