摘要: Luminous extragalactic masers are traditionally referred to as the `megamasers'. Those produced by water molecules associated with accretion disks, radio jets, or outflows in nuclear regions of active galactic nuclei (AGN). The majority OH maser sources instead driven intense star formation ultra-luminous infrared galaxies, although a few cases emission traces rotating (toroidal disk) structures around engines AGN. Thus, detailed studies provide fundamental contribution our knowledge main components AGN, constitute unique tools measure geometric distances host and have great impact on probing the, so far, paradigmatic Unified Model
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