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The accurate measurement of extragalactic distances is a central challenge of modern astronomy, being required for any realistic description of the age, geometry and fate of the Universe. The measurement of relative extragalactic distances has become fairly routine, but estimates of absolute distances are rare 1. In the vicinity of the Sun, direct geometric… (More)
Electrostatic atomization has been studied to inject charged water droplets into oil in a microchannel reactor system. With a negative DC voltage, Taylor cone was formed and the droplets were injected into oil within 1/30 sec. The injection took place periodically with interval of a few seconds when the DC voltage was maintained. Using water, droplets of… (More)
We report a 3σ upper limit of 220 µJy on any 22-GHz continuum emission coincident with the central engine in NGC 4258. If NGC 4258 is powered by an advection-dominated accretion flow, this radio upper limit implies that the inner advection-dominated flow cannot extend significantly beyond ∼ 10 2 Schwarzschild radii.
We have observed the nuclear region of an edge-on spiral galaxy NGC 5793 with VLBI in order to determine the morphology of the central continuum source at 6 and 18 cm and the distribution of OH molecular gas at 18 cm on parsec scales. NGC 5793, with a type 2 Seyfert nucleus, is known to have peculiar H 2 O maser features in its center, indicating the… (More)