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

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6. GLOBAL H2, HI, AND IR IN GALAXIES

A major goal of extragalactic CO studies has been to understand the evolution of galaxies through comparison of the gas contents (H2 and H I) and star formation rates as a function of galaxy type, luminosity, and environment. Initial studies in this area were conducted by the investigators listed in Table 2, with statistical analyses presented by Rengarajan & Verma (1986), Verter (1987), and Young et al (1989). Here, we consider the global properties of over 300 galaxies from numerous studies (see Table 2), in which CO was mapped to determine the global flux.

Table 2. Published surveys of CO in galaxies
Galaxy
Class 		Sample
Size 		No.
Detected 		Telescope a Reference
Ellipticals 1 1 IRAM Huchtmeier et al (1988)
7 2 IRAM Gordon (1991)
IR Bright
Centers 20 10 FCRAO Young et al (1984b)
Maps 14 14 FCRAO Young et al (1986a)
High Luminosity 15 15 FCRAO Sanders et al (1986)
High Luminosity 3 3 OVRO Sanders et al (1988a)
Ultra-high Lum. 5 4 SEST Mirabel et al (1988b)
High Luminosity 4 4 OVRO Scoville et al (1989)
Global
Properties 		124 108 FCRAO Young et al (1989)
Maps 29 29 NRAO Tinney et al (1990)
High Luminosity 60 60 NRAO Sanders et al (1991)
Irregulars
Magellanic 6 1 NRAO Elmegreen et al (1980)
Star-forming 1 1 FCRAO Young et al (1984a)
Star-forming 3 3 FCRAO Tacconi & Young (1985)
Clumpy Irregulars 2 0 NRO Sofue et al (1986)
Dwarf Irr's 15 6 FCRAO Tacconi & Young (1987)
Blue Compact 12 0 IRAM Arnault et al (1988)
Galaxies
Isolated and Interacting
Maps 26 26 FCRAO Young et al (1986b)
Maps 93 90 FCRAO/NRAO Solomon & Sage (1988)
Markarian 14 14 IRAM Krugel et al (1990)
Quasars 1 1 IRAM Barvainis et al (1989)
1 1 IRAM Sanders et al (1989)
Radio Bright 21 20 FCRAO/NRAO Sanders & Mirabel (1985)
Seyferts 9 2 NRAO/BTL Bieging et al (1981)
9 0 NRAO Wilson et al (1979)
43 18 NRAO Heckman et al (1989)
2 2 IRAM Sanders et al (1989)
3 2 BIMA Meixner et al (1990)
12 4 NRO Taniguchi et al (1990a)
S0s
Centers 11 5 NRAO Sage and Wrobel (1989)
S0-Sa 20 11 FCRAO Thronson et al (1989a)
E-S0 24 22 OSO, SEST,
IRAM 		Wiklind & Henkel (1989)
Spirals
Gas-rich 29 5 NRAO Rickard et al (1977)
Nearby 81 5 NRAO Rowan-Robinson et al (1980)
Range of
Arm Types 29 20 BTL Stark et al (1987)
Hubble Types 19 6 BTL Verter (1983)
SAB Galaxies 23 5 NRAO Elmegreen & Elmegreen (1982)
Sc's 9 9 FCRAO Young & Scoville (1982b)
Spirals 13 11 NRAO Adler & Liszt (1989)
Starbursts 42 9 FCRAO Jackson et al (1989)
Nuclear
Starburts 		18 16 FCRAO Young & Devereux (1991)
Virgo Cluster
Centers 25 18 FCRAO Young et al (1985)
Centers 7 7 OVRO Canzian (1990)
Major Axis
Maps 		52 34 FCRAO Kenney & Young (1986, 1988a, b, 1989)
Total CO 47 25 BTL Stark et al (1986)
13CO Observations
Centers 8 5 BTL Encrenaz et al (1979)
Disks 6 6 NRAO Rickard & Blitz (1985)
Disks 6 6 FCRAO Young & Sanders (1986)
a Telescopes are as in Table 1.

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