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Title:
CO excitation and H2 masses of infrared-luminous galaxies
Authors:
Radford, Simon J. E.; Downes, D.; Solomon, P. M.
Affiliation:
AA(Institut de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AB(Institut de Radioastronomie Millimetrique, Saint-Martin-d'Heres, France), AC(Grenoble, Observatoire, France; Max-Planck-Institut fuer Radioastronomie, Bonn, Federal Republic of Germany; New York, State University, Stony Brook)
Publication:
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 368, Feb. 10, 1991, p. L15-L18. (ApJL Homepage)
Publication Date:
02/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
CARBON MONOXIDE, GALACTIC RADIATION, GAS DENSITY, HYDROGEN, INFRARED SOURCES (ASTRONOMY), INTERSTELLAR GAS, MOLECULAR CLOUDS, MOLECULAR EXCITATION, BRIGHTNESS TEMPERATURE, DENSITY MEASUREMENT, MASS TO LIGHT RATIOS, MILKY WAY GALAXY, QUASARS
DOI:
10.1086/185937
Bibliographic Code:
1991ApJ...368L..15R

Abstract

The CO(2-1) and CO(1-0) emission from four infrared-luminous galaxies, Arp 193, Arp 220, Mrk 231, and VII Zw 31, was mapped with the IRAM 30 m telescope. These maps show the molecular gas is concentrated in the central regions. The CO(2-1)/CO(1-0) brightness temperature ratio for these galaxies is low, 0.6-0.75, indicating the CO is subthermally excited in regions of moderate H2 density, roughly 400/cu cm. The intrinsic CO(1-0) brightness temperatures are inferred to be between 6 and 13 K, even if the gas kinetic temperatures are much higher. For these galaxies, the H2 mass-to-CO luminosity ratio is similar to that measured for giant molecular clouds in the Milky Way molecular ring.

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