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Properties of OH Megamaser Galaxies

Published online by Cambridge University Press:  14 August 2015

Rafik Kandalyan*
Affiliation:
378433 Byurakan Astrophysical Observatory, Armenia e-mail: [email protected]@ipia.sci.am

Abstract

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An analysis of a sample of OH megamaser galaxies is presented. It is shown that the dependence of OH luminosity on FIR (far infrared) luminosity is not quadratic, as previously assumed, but closer to linear. Using a luminosity function of the luminous infrared galaxies, as well as linear relationship between OH and FIR luminosities the expected number of OH megamaser galaxies has been estimated. Spectral energy distributions (SED) of 16 megamaser galaxies have been constructed using multiwavelength (from radio to X-ray) data. The SED of megamasers look closely similar from radio to X-ray. It is shown that the maser amplification coefficient depends both on the OH main line to 60 micron ratio and the main line to 2.2 micron ratio. The OH main lines ratio (f1667/f1665) decreases, while the flux density at 10 micron is increasing.

Type
II. Joint Discussions
Copyright
Copyright © Kluwer 1998

References

Baan, W.A., (1989) Infrared Properties of OH Galaxies, ApJ, Vol. 338, pp. 804811 CrossRefGoogle Scholar
Baan, W.A., (1991) Active Nuclei and Molecular Megamasers, in Skylines: Proceedings of the Third Haystack Conf., Haschick, A.D. & Ho, P.T.P., eds. (ASP Conf.Ser., 16), pp. 4555 Google Scholar
Baan, W.A., (1997), Exploring OH Megamasers, this issue, IAU GA JD 21 Google Scholar
Baan, W.A. et al., (1992) IRAS 14070+0525: An OH Gigamaser at z=0.265, ApJ, Vol. 396, pp. L99L102 CrossRefGoogle Scholar
Burdyuzha, V. & Romberg, B., (1990) The Possible Existence of Powerful Masers at Early Epochs of the Universe, A&A, Vol. 234, pp. 4042 Google Scholar
Kandalyan, R.A., (1996) Megamaser Galaxies, Astrophysics, Vol. 39, pp. 237244 CrossRefGoogle Scholar
Martin, J.-M. et al., (1988) Dwarf and Giant Extragalactic Megamasers: IRAS 1224-0036 and IRAS 1201+1941, A&A, Vol. 201, L13L18 Google Scholar
Sanders, D.B. et al., (1988) Warm Ultraluminous Galaxies in the IRAS Survey: The Transition from Galaxy to Quasar, ApJ, Vol. 328, pp. L35L39 CrossRefGoogle Scholar
Saunders, W. et al., (1990) The 60 micron and Far Infrared Luminosity Function of IRAS Galaxies, MNRAS, Vol. 242, pp. 318337 CrossRefGoogle Scholar