Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..129n&link_type=abstract
In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 129-132 (SEE N85-20961 1
Astronomy and Astrophysics
Astronomy
1
Active Galactic Nuclei, Balmer Series, Quasars, Seyfert Galaxies, Astronomical Models, Iron, Lyman Alpha Radiation, Red Shift, Ultraviolet Astronomy, Ultraviolet Spectra
Scientific paper
Simultaneous ultraviolet and optical observations of several Seyfert 1 galaxies and QSOs were carried out in an attempt to understand some broad emission features between 2000 and 5000 A. Most of the emission is due to Fe II and Balmer continuum. Improved model calculations were used to estimate the flux in these components and to compare the strengths of the ultraviolet and optical Fe II lines. Spectral fitting shows that the ultraviolet Fe II lines are much stronger than previously believed. Strong ultraviolet Fe II lines are present even in objects showing weak optical Fe II lines. The total flux in Fe II lines sometimes exceeds the Lyman alpha flux by up to a factor of 2, and there may well be a general Fe II/Lyman alpha problem, with important consequences for the modeling of the broad emission line region in active galactic nuclei.
Netzer Hagai
Wamsteker Willelm
Wills Beverley J.
Wills Danielle
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