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Title:
Broad hydroxyl emission in IC 4553
Authors:
Baan, W. A.; Wood, P. A. D.; Haschick, A. D.
Affiliation:
AA(Pennsylvania State University, University Park, PA), AB(Pennsylvania State University, University Park, PA), AC(Haystack Observatory, Westford, MA)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 260, Sept. 15, 1982, p. L49-L52. (ApJL Homepage)
Publication Date:
09/1982
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Galactic Nuclei, Hydroxyl Emission, Interstellar Masers, Peculiar Galaxies, Radio Galaxies, Emission Spectra, Galactic Rotation, Line Spectra, Power Spectra, Radial Velocity, Starburst Galaxies
DOI:
10.1086/183868
Bibliographic Code:
1982ApJ...260L..49B

Abstract

The main line transitions of hydroxyl (OH) have been detected in emission in the peculiar galaxy IC 4553. The 1667 and 1665 MHz transitions appear in a ratio of 4.2:1, and both have a radial velocity of 5375 km/sec and a full width at half-maximum of 108 km/sec. This is the first detection of broad OH emission in an external galaxy. The features are probably due to stimulated emission from many H II/OH masers in the active nuclear region of the galaxy. It is suggested that IC 4553 is a starburst galaxy.

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