Annu. Rev. Astron. Astrophys. 1991. 29: 581-625
Copyright © 1991 by . All rights reserved

Reprinted with kind permission from , 4139 El Camino Way, Palo Alto, California, USA


MOLECULAR GAS IN GALAXIES

J.S. Young

Department of Physics and Astronomy and Five College Radio
Astronomy Observatory
, University of Massachusetts, Amherst,
Massachusetts 01003

N.Z. Scoville

Astronomy Department, California Institute of Technology 105-24,
Pasadena, California 91125


Key Words: star formation, Hubble sequence, galaxy evolution, interstellar medium


Table of Contents

INTRODUCTION

MOLECULAR MASS DETERMINATIONS
Theoretical Basis
Empirical Basis

RADIAL DISTRIBUTIONS IN SPIRAL GALAXIES
Unbarred Spiral Galaxies
Barred Spiral Galaxies
13CO Observations of Galaxies

SPIRAL STRUCTURE IN M51

LOCAL GROUP GALAXIES

GLOBAL H2, HI, AND IR IN GALAXIES
Total H2 Masses
Ratio of H2 to HI
Gas Mass Fractions in Spiral Galaxies
The Gas-to-Dust Ratio in Spiral Galaxies
CO-IR Luminosity Correlation

STAR FORMATION RATES AND EFFICIENCIES IN GALAXIES
The Star Formation Efficiency in the Disks of NGC 6946 and M51
Arm-Interarm Variations

GALACTIC INTERACTIONS
Star Formation Efficiencies
Interaction Morphology

GALACTIC NUCLEI
M82
NGC 1068
Ultraluminous Infrared Galaxies
Quasars

CONCLUSIONS

REFERENCES

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