Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...233...53w&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 233, no. 1, July 1990, p. 53-61. Research supported by SNSF.
Astronomy and Astrophysics
Astrophysics
23
Absorption Spectra, Galactic Radiation, Seyfert Galaxies, Ultraviolet Spectra, Active Galactic Nuclei, Interstellar Gas, Ionizing Radiation, Line Spectra, Temporal Distribution
Scientific paper
The ultraviolet spectrum of the Seyfert 1 galaxy NGC 3516 shows several intrinsic variable absorption lines. The properties of the C IV absorption profile are analyzed, using IUE observations performed between 1978 and 1989. The absorption line can be successfully modeled with a narrow component and a broader component variable in width and depth. For all epochs the correlation between the column density of the broad component and the continuum flux at 1550 A is only fair, but this correlation is very good and linear during two periods of 1.5 years and 2.3 years. From this it is deduced that the absorbing material is at a typical distance of 10 to the 18th cm from the ionizing source, and that it is in clouds of typical geometrical thickness of 10 to the 15th cm. A cloud stays on the line of sight for a period of 1 to 2 years.
Buson Lucio Maria
Courvoisier Thierry J. -L.
Ulrich Marie-Helene
Walter Robert
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