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Title:
Molecular gas in luminous infrared galaxies
Authors:
Sanders, D. B.; Scoville, N. Z.; Soifer, B. T.
Affiliation:
AA(California Institute of Technology, Pasadena; Hawaii, University, Honolulu), AB(California Institute of Technology, Pasadena), AC(California Institute of Technology, Pasadena)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 370, March 20, 1991, p. 158-171. Research supported by NASA IRAS Extended Mission Program. (ApJ Homepage)
Publication Date:
03/1991
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
GALACTIC STRUCTURE, INFRARED SOURCES (ASTRONOMY), LUMINOSITY, MOLECULAR GASES, ACTIVE GALACTIC NUCLEI, EMISSION SPECTRA, INFRARED ASTRONOMY SATELLITE, INTERSTELLAR MATTER, LINE SPECTRA, RED SHIFT
DOI:
10.1086/169800
Bibliographic Code:
1991ApJ...370..158S

Abstract

Radio observations of 60 bright IRAS galaxies with redshifts of 1500-25,000 km/sec are reported. Data obtained in the 1-0 line of CO using the 12-m NRAO radio telescope during 1985-1988 are presented in extensive tables, graphs, and line profiles and analyzed along with similar data on 29 less distant IRAS bright galaxies (Tinney et al., 1990). The galaxies are found to have H2 masses of (1-60) x 10 to the 9th solar mass and a mean ratio of H2 to warm dust of 540 + or - 290, corresponding to a total gas/dust ratio of 900-1100. The discrepancy between this value and that for the Galaxy (about 150) is tentatively attributed to the presence of undetected cold dust or errors in interpreting the IR data. The mechanisms which might be responsible for the high ratios of IR luminosity to H2 mass (2-220 solar luminosity per solar mass) are discussed.

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