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Article Contents

ABSTRACT

1.INTRODUCTION

2.MOLECULAR GAS FROM THE INNER TO THE OUTER REGIONS OF GALAXIES

3.MOLECULAR ISM MASSES: BASIC EQUATIONS
3.1.Brightness Temperature, Flux Density and Luminosity
3.2.Observations of the Molecular ISM using CO Line Emission
3.2.1.CO(J = 1-0) Line Emission
3.2.2.CO(J = 2-1) Line Emission
3.3.Observations of the Molecular ISM using Dust Continuum Emission
3.4.The ISM in Extreme Environments Such as the Outskirts
3.4.1.Variations of α10 (or XCO)
3.4.2.Variations of R21/10
3.4.3.Variations of Dust Properties and Temperature

4.MOLECULAR GAS OBSERVATIONS IN THE OUTSKIRTS OF DISK GALAXIES
4.1.The Milky Way
4.1.1.Properties of Molecular Clouds in the Outer Milky Way
4.2.Extragalactic Disk Galaxies
4.2.1.Molecular Gas Detections
4.2.2.Star Formation in Extragalactic Disk Galaxies
4.2.3.Theory

5.MOLECULAR GAS OBSERVATIONS IN THE OUTSKIRTS OF EARLY-TYPE GALAXIES

6.MOLECULAR GAS OBSERVATIONS IN GALAXY GROUPS AND CLUSTERS

7.CONCLUSIONS AND FUTURE DIRECTIONS

REFERENCES