IUE absorption studies of broad- and narrow-line gas in Seyfert galaxies

Details IUE absorption studies of broad- and narrow-line gas in Seyfert galaxies IUE absorption studies of broad- and narrow-line gas in Seyfert galaxies

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986inpr.conf...77v&link_type=abstract

In NASA. Ames Research Center Summer School on Interstellar Processes: Abstracts of Contributed Papers p 77-78 (SEE N87-15043 0

Astronomy and Astrophysics

Astronomy

Absorption Spectra, Broadband, Interstellar Gas, Line Spectra, Narrowband, Seyfert Galaxies, Galactic Nuclei, H Ii Regions, Iue, Photoionization, Ultraviolet Radiation, X Ray Astronomy

Scientific paper

The 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.

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