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Title:
OH megamasers in high-luminosity IRAS galaxies
Authors:
Mirabel, I. F.; Sanders, D. B.
Affiliation:
AA(CONICET, Instituto de Astronomia y Fisica del Espacio, Buenos Aires, Argentina; Universidad de Puerto Rico, San Juan), AB(California Institute of Technology, Pasadena)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 15, 1987, p. 688-693. NSF-NASA-supported research. (ApJ Homepage)
Publication Date:
11/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Abundance, Galactic Radiation, Hydrogen Clouds, Hydroxyl Emission, Infrared Astronomy Satellite, Interstellar Masers, Carbon Monoxide, Far Infrared Radiation, Radial Velocity, Star Formation
DOI:
10.1086/165764
Bibliographic Code:
1987ApJ...322..688M

Abstract

OH megamaser emission and H I and CO profiles from the distant infrared galaxies IRAS 10173 + 0828, III Zw 035, and Zw 475.056 are reported. The OH isotropic luminosities at 1667 MHz are 463, 534, and 6.6 solar luminosities, respectively. Far-infrared pumping efficiencies of the OH greater than 1 percent are found in IRAS 10173 + 0828 and III Zw 035. These two galaxies show anomalously large 1667/1665 MHz emission line ratios. OH megamasers reside in the nuclei of superluminous far-infrared galaxies that have a high content of molecular gas, high efficiency of star formation, and in some instances, a striking deficiency of atomic hydrogen.

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