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Article
The Sub-Pc Scale Accretion Disk of Ngc 4258
Water megamasers have been found to trace parsec/sub-parsec, circumnuclear accretion disks in several AGN (e.g., Circinus, NGC 1068 & NGC 4258). High-spatial (0.5 mas) and velocity resolution (0.2 km s−1) VLBA im...
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Article
Shocks in the Radio Photospheres of Long Period Variables Stars