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Astrophysics

arXiv:astro-ph/0003119 (astro-ph)
[Submitted on 8 Mar 2000]

Title:VSOP Observations of a Sub-Parsec Accretion Disk

Authors:D. L. Jones, A. E. Wehrle, B. G. Piner, D. L. Meier
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Abstract: The 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.
Comments: To appear in "Astrophysical Phenomena Revealed by Space VLBI", ed. H. Hirabayashi, P. Edwards, and D. Murphy (ISAS, Japan)
Subjects: Astrophysics (astro-ph)
Cite as: arXiv:astro-ph/0003119
  (or arXiv:astro-ph/0003119v1 for this version)
  https://doi.org/10.48550/arXiv.astro-ph/0003119

Submission history

From: Dayton Jones [view email]
[v1] Wed, 8 Mar 2000 22:41:34 UTC (20 KB)
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