Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..127b&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 127-128 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
Galactic Nuclei, Nebulae, Ultraviolet Spectra, Active Galactic Nuclei, Emission Spectra, Iue, Line Spectra, Ultraviolet Astronomy
Scientific paper
The Seyfert nucleus of NGC 4151 was monitored for six years, including periods of intensive study of the complex variations in the ultraviolet spectra with IUE. Important IUE results relating to the broad line region (BLR) and its physical conditions are reviewed herein. Active galactic nuclei like NGC 4151 are studied to derive detailed constraints on radiation mechanisms and physical conditions in the emission region, and hence also constraints on possible central power sources. The ultraviolet spectrum of NGC 4151 comprises continuum, strong emission lines with different widths along with a rich absorption line spectrum. Variations in the broad absorption lines seem to derive principally from changes in column densities of absorbing species rather than in velocity dispersions or line profiles.
Boksenberg Alec
Bromage Gordon E.
Clavel Jean
Demoulin-Ulrich M. H.
Elvius Aina
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