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Modelling of the X-ray broad absorption features in Narrow-Line Seyfert 1s

D. Porquet·M. Mouchet·A. -M. Dumont
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Abstract

We investigate the origin of the broad absorption features detected near 1-1.4 keV in several Narrow Line Seyfert 1 galaxies, by modelling the absorbing medium with various physical parameters, using the ionization code PEGAS. The observed properties of the X-ray absorption features can be reproduced by taking into account the peculiar soft X-ray excess which is well fitted by a blackbody plus an underlying power law. We equally stress that the emission coming from the absorbing medium (related to the covering factor) has a strong influence on the resulting X-ray spectrum, in particular on the apparent position and depth of the absorption features. A non-solar iron abundance may be required to explain the observed deep absorption. We also investigate the influence of an additional collisional ionization process (hybrid case) on the predicted absorption features.

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D. Porquet, M. Mouchet, A. -M. Dumont. 2000-05-08. Modelling of the X-ray broad absorption features in Narrow-Line Seyfert 1s. https://arxiv.org/abs/astro-ph/0005169

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