The complex and variable absorption of Ngc 3516 observed by BeppoSAX

We present 2 BeppoSAX (0.1-150 keV) observations of the Seyfert 1 galaxy NGC 3516, taken 4 mo apart (8-11-1996, 12-03-1997). We find that during the 1996 observation the nuclear X-ray continuum was absorbed by an unusually large amount of cold gas clearly associated with the AGN environment. Unabsor...

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Main Authors: Costantini, E, Salvini, C, Comastri, A, Fruscione, A, Mathur, S, Nicastro, F, Stirpe, G M, Wilkes, B
Format: Conference Proceeding
Language:English
Online Access:Get full text
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Summary:We present 2 BeppoSAX (0.1-150 keV) observations of the Seyfert 1 galaxy NGC 3516, taken 4 mo apart (8-11-1996, 12-03-1997). We find that during the 1996 observation the nuclear X-ray continuum was absorbed by an unusually large amount of cold gas clearly associated with the AGN environment. Unabsorbed thermal emission is also seen below 3 keV during this observation. Finally, the 0.1-10-keV spectra of both the observations show the presence of a complex system of ionized absorbing matter, which we parameterize with two "warm absorbers" with quite different degrees of ionization and column densities. (Author)
ISSN:0094-243X