2007MNRAS.378..873C -
Mon. Not. R. Astron. Soc., 378, 873-880 (2007/July-1)
A longer XMM-Newton look at I Zwicky 1: physical conditions and variability of the ionized absorbers.
COSTANTINI E., GALLO L.C., BRANDT W.N., FABIAN A.C. and BOLLER T.
Abstract (from CDS):
We present a spectral analysis of the narrow-line Seyfert 1 galaxy IZwicky1, focusing on the characteristics of the ionized absorbers as observed with XMM-Newton in 2005. The soft X-ray spectrum shows absorption by two components of ionized gas with a similar column density (NH∼ 1021/cm2) and ionization parameters logξ ∼ 0 and 2.5. Comparing this observation with a 2002 XMM-Newton data set, we see a clear anticorrelation between the X-ray ionization parameter ξX and the 0.1-10keV luminosity. Viable explanations for this effect include transient clouds or filaments crossing the line of sight in a complex geometry or a gas observed in non-equilibrium. The outflow velocity of the X-ray low-ionization absorber is consistent with the outflow of the ultraviolet (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-ionization 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.
Abstract Copyright:
2007 The Authors. Journal compilation © 2007 RAS
Journal keyword(s):
galaxies: individual: IZw1 - quasars: absorption lines - galaxies: Seyfert - ultraviolet: galaxies - X-rays: galaxies
Simbad objects:
2
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