http://arxiv.org/abs/1801.08796
The RadioAstron space-VLBI mission has successfully detected extragalactic H2O MegaMaser emission regions at very long Earth to space baselines ranging between 1.4 and 26.7 Earth Diameters (ED). The preliminary results for two galaxies, NGC3079 and NGC4258, at baselines longer than one ED indicate masering environments and excitation conditions in these galaxies that are distinctly different. Further observations of NGC4258 at even longer baselines are expected to reveal more of the physics of individual emission regions.
W. Baan, A. Alakoz, T. An, et. al.
Mon, 29 Jan 18
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Comments: To be published in Astrophysical Masers: Unlocking the Mysteries of the Universe, IAU Symposium 336, 2017