Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-10-21
Astronomy and Astrophysics
Astrophysics
13 pages, 14 figures, version accepted for publication in A&A
Scientific paper
We present results of the photoionization code IRIS, which calculates the spectrum emitted by the Warm Absorber (WA) in Seyfert 1 galaxies for a large grid of parameters (density, column density, ionization parameter...). We show that in Seyfert 1s, coronal lines Fe X, Fe XI, Fe XIV...), whose emission region shares common characteristics with the WA, could be formed in the WA. Unlike the absorption edges, such as those of O VII and O VIII observed in soft X-rays which are produced by the WA, these lines strongly constrain the physical parameters of the WA, especially the hydrogen density. Indeed, in order to avoid producing coronal line equivalent widths larger than observed, a high density (nH \geq 10^{10} cm-3) is required for the WA in most cases. This result is obtained for the mean observed Seyfert 1 features, as well as for the case study of MCG-6-30-15. It implies that the distance of the WA from the incident radiation source is of the order of that of the Broad Line Region (BLR)
Collin Suzy
Dumont Anne-Marie
Mouchet Martine
Porquet Delphine
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