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Article Contents

ABSTRACT

1.HOW TO OBSERVE H2 IN GALAXIES?
1.1.The H2 / CO conversion ratio
1.2.Dust as a tracer
1.3.Gamma-rays
1.4.Direct H2 observations

2.CO AND H2 CONTENT OF GALAXIES
2.1.Variation with morphological type
2.2.Dwarf and LSB galaxies
2.3.Ultra-luminous IRAS galaxies

3.SPATIAL DISTRIBUTION
3.1.Radial Distributions
3.2.Large-scale Structure
3.3.Vertical Structure
3.4.Small scale structure of clouds

4.H2 AS A DARK MATTER CANDIDATE
4.1.Baryonic mass fraction
4.2.The smallest fragments
4.3.Gamma-rays
4.4.Various models of H2 as dark matter
4.5.Detection possibilities

5.CONCLUSIONS

REFERENCES