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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