Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986esasp.263..645c&link_type=abstract
In its Proceedings of an International Symposium on New Insights in Astrophysics. Eight Years of UV Astronomy with IUE p 645-64
Astronomy and Astrophysics
Astrophysics
Galactic Radiation, Line Spectra, Seyfert Galaxies, Accretion Disks, Periodic Variations, Spectral Line Width, Ultraviolet Spectra
Scientific paper
The 1450 to 1720 A interval in the UV spectrum of the Seyfert 1 galaxy NGC 4151 was examined, using line profile fitting techniques to study temporal variations at 69 different epochs from 1978 to 1983. Over a distance range from 5 light-days up to 500 light-years from the nucleus, the velocity law is Keplerian. An intermediate region, whose density (10 million cc) velocity dispersion (1600 km/sec) and dimension (250 light-days) are intermediate between those of the broad and narrow line regions is identified. Evidence of gas expanding at 4000 km/sec at a few light-days from the nucleus is found. This outflow is presumably decelerated outward and partially obscured by an accretion disk seen almost edge-on.
Altamore Aldo
Boksenberg Alec
Bromage Gordon E.
Clavel Jean
Elvius Aina
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