ZW 15107 + 0724 and the family of OH megamasers

Abstract

view Abstract Citations (30) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS ZW 15107+0724 and the Family of OH Megamasers Baan, Willem A. ; Henkel, Christian ; Haschick, Aubrey D. Abstract 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. Publication: The Astrophysical Journal Pub Date: September 1987 DOI: 10.1086/165531 Bibcode: 1987ApJ...320..154B Keywords: 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; Astrophysics; GALAXIES: INDIVIDUAL ALPHANUMERIC: ZW 15107; 0724; GALAXIES: SEYFERT; MASERS full text sources ADS | data products NED (18) SIMBAD (14)