The ultraviolet spectrum of NGC 4151 from 1978 to 1990 - General characteristics and evolution

Details The ultraviolet spectrum of NGC 4151 from 1978 to 1990 - General characteristics and evolution The ultraviolet spectrum of NGC 4151 from 1978 to 1990 - General characteristics and evolution

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...382..483u&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 382, Dec. 1, 1991, p. 483-500. Research supported by CNR and MURST.

Astronomy and Astrophysics

Astrophysics

59

Active Galactic Nuclei, Galactic Evolution, Seyfert Galaxies, Ultraviolet Spectra, Astronomical Spectroscopy, Emission Spectra, Interstellar Gas, Iue, Light Curve, Line Spectra

Scientific paper

The evolution of the active nucleus of NGC 4151 on time scales ranging from days to 10 yrs based on IUE observations. A detailed study is presented of the long- and short-term temporal behavior of the wings of the C IV and Mg II lines and the variations of the semiforbidden C III line. The results are interpreted as due to the redistribution or rearrangement of the fast-moving gas on a time scale of one to a few yrs, probably in the form of the arrival of a new gas cloud in the inner part of the broad-line region.

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