Broad hydroxyl emission in IC 4553

Details Broad hydroxyl emission in IC 4553 Broad hydroxyl emission in IC 4553

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260l..49b&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 260, Sept. 15, 1982, p. L49-L52.

Astronomy and Astrophysics

Astrophysics

104

Galactic Nuclei, Hydroxyl Emission, Interstellar Masers, Peculiar Galaxies, Radio Galaxies, Emission Spectra, Galactic Rotation, Line Spectra, Power Spectra, Radial Velocity, Starburst Galaxies

Scientific paper

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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