Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001pabei..19..387x&link_type=abstract
Progress in Astronomy, Vol. 19, No. 3, p. 387 - 396 (2001)
Astronomy and Astrophysics
Astronomy
Active Galaxies, Galactic Nuclei, Seyfert Galaxies, Interstellar Matter: Masers, Radio Lines
Scientific paper
Main observational results and theoretical studies for H2O megamasers are briefly reviewed. The H2O megamaser emission often originates in thin circumnuclear disks near the centers of active galactic nuclei (AGN) and has been detected in 20 galaxies with isotropic luminosities of about 10 - 6000 Lsolar. All of megamaser galaxies show evidence for nuclear activity, being classified as either Seyfert 2 or LINER, so there appears to be a link between the megamaser phenomenon and AGN. There was a trend for megamasers to occur preferentially in highly inclined host galaxies. The AGN apparently produces the seed radio photons and the X-ray photons or shock waves need to pump the maser material. The observed spectral charateristics support a model with inverted molecular gas located in front of the nuclear source that in part amplifies the background continuum.
Jiang Dongrong
Xu Ye
Yu Zhiyao
Zheng Xingwu
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