ZW 15107 + 0724 and the family of OH megamasers

Details ZW 15107 + 0724 and the family of OH megamasers ZW 15107 + 0724 and the family of OH megamasers

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...320..154b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 320, Sept. 1, 1987, p. 154-158.

Astronomy and Astrophysics

Astronomy

23

Electron Transitions, Emission Spectra, Ground State, H I Regions, Line Spectra, Masers, Hydroxyl Compounds, Infrared Lasers, Molecular Gases, Radiation Distribution, Radio Sources (Astronomy), Seyfert Galaxies

Scientific paper

The galaxy Zw 15107 + 0724 exhibits broad H I absorption at its systematic velocity of 3902 km/s and emission in the two main ground-state transitions of OH. The isotropic luminosity of the 1667 MHz OH emission line is 10.8 solar, which makes it the weakest megamaser yet found. The optical depth of the OH line is approximately -0.37. An assessment of the infrared properties of OH megamasers indicates that these sources have an approximately thermal IR spectrum with a temperature between 50 and 90 K. The OH absorbing galaxies, which have an edge-on molecular disk as do the megamaser galaxies, do not distinguish themselves significantly from a much larger sample of strong infrared sources. Megamaser galaxies appear to be a very early phase of Seyfert 2 or H II nuclear activity, when much dust is still present close to the nucleus.

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