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IUE absorption studies of broad- and narrow-line gas in Seyfert galaxiesThe interstellar medium of a galaxy containing an active nucleus may be profoundly affected by the high energy (X-ray, EUV) continuum flux emanating from the central source. The energetic source may photoionize the interstellar medium out to several kiloparsecs, thereby creating a global H II region. The International Ultraviolet Explorer (IUE) satellite has attempted to observe in several Seyfert galaxies (NGC 3516, NGC 4151, NGC 1068, 3C 120) the narrow absorption lines expected from such global H II regions. Instead, in two of the galaxies (NGC 3516, NGC 4151) broad, variable absorption lines at C IV lambda 1550, N V lambda 1240, and Si IV lambda 1400 were found, as well as weaker absorption features at O I lambda 1302 and C II lambda 1335. These features swamp any possible global H II region absorption. Such broad absorption features have previously been observed in IUE data, but their origin is still not well understood.
Document ID
19870005651
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Voit, G. M. (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Shull, J. M. (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Begelman, M. C. (Joint Inst. for Lab. Astrophysics Boulder, CO, United States)
Date Acquired
August 13, 2013
Publication Date
October 1, 1986
Publication Information
Publication: NASA. Ames Research Center Summer School on Interstellar Processes: Abstracts of Contributed Papers
Subject Category
Astrophysics
Accession Number
87N15084
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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IDRelationTitle19870005610Collected WorksSummer School on Interstellar Processes: Abstracts of contributed papers
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