Spectral energy distribution of OH megamaser galaxies |
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| Authors: | R A Kandalian |
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| Institution: | (1) V. A. Ambartsumian Byurakan Astrophysical Observatory, Armenia |
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| Abstract: | The properties of OH megamaser galaxies are analyzed. Using the linear dependence of L
OH
on L
FIR
and the luminosity function for IR galaxies, the expected number of megamasers is estimated. From observational data at many
frequencies (from radio waves to x rays), the spectral energy distributions (SEDs) of 16 objects have been plotted and studied.
The SEDs of megamasers have the same form from the radio to the x ray range. Considerable emission is observed in the 3 μm
range, which evidently indicates the presence of red giants and supergiants in these objects. Possible reasons for the departure
of the slope of the dependence of L
OH
on L
FIR
from unity are considered. The assumption that collisional pumping may play an important role in the inversion of ground levels
of the OH molecule and the saturated gain mechanism in megamasers is confirmed.
Translated from Astrofizika, Vol. 42, No. 1, pp. 23–36, January–March, 1999. |
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| Keywords: | |
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