VSOP Observations of a Sub-Parsec Accretion Disk

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dc.creatorJones, D. L.
dc.creatorWehrle, A. E.
dc.creatorPiner, B. G.
dc.creatorMeier, D. L.
dc.date2000-03-08
dc.date.accessioned2026-07-07T01:52:40Z
dc.date.available2026-07-07T01:52:40Z
dc.descriptionThe physical conditions in the inner parsec of accretion disks believed to orbit the central black holes in active galactic nuclei can be probed by imaging the absorption of background radio emission by ionized gas in the disk. We report high angular resolution observations of the nearby galaxy NGC 4261 which show evidence for free-free absorption by a thin, nearly edge-on disk at several frequencies. The angular width, and probably the depth, of the absorption appears to increase with decreasing frequency, as expected. Because free-free absorption is much larger at lower frequencies, the longest possible baselines are needed to provide adequate angular resolution; observing at higher frequencies to improve resolution will not help.
dc.descriptionTo appear in "Astrophysical Phenomena Revealed by Space VLBI", ed. H. Hirabayashi, P. Edwards, and D. Murphy (ISAS, Japan)
dc.identifierhttps://arxiv.org/abs/astro-ph/0003119
dc.identifierhttp://arxiv.org/abs/astro-ph/0003119
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/697
dc.subjectAstrophysics
dc.titleVSOP Observations of a Sub-Parsec Accretion Disk
dc.typetext

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