A longer XMM-Newton look at IZwicky1: physical conditions and variability of the ionized absorbers
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Publication date
2007
Authors
Costantini, E.
Gallo, L.C.
Brandt, W.N.
Fabian, A.C.
Boller, T.
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Abstract
We present a spectral analysis of the narrow-line Seyfert 1 galaxy I Zwicky 1, focusing on the characteristics of the ionised absorbers as observed with XMM-Newton in 2005. The outflow velocity of the X-ray low-ionisation absorber is consistent with the outflow of the UV absorber detected in a past Hubble Space Telescope observation. In addition, the ionic column densities of Civ and Nv derived from the X-ray model are consistent with the UV values. This suggests that the low-ionisation outflowing gas may survive for many years, despite large changes in flux, and that there is a tight connection between the X-ray and UV absorbers that can only be confirmed with a simultaneous UV and X-ray observation.
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Costantini, E, Gallo, L C, Brandt, W N, Fabian, A C & Boller, T 2007, 'A longer XMM-Newton look at IZwicky1: physical conditions and variability of the ionized absorbers', Monthly Notices of the Royal Astronomical Society, vol. 378, no. 3, pp. 873-880.