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1999MNRAS.307..821W - Mon. Not. R. Astron. Soc., 307, 821-829 (1999/August-3)
Ionized ultraviolet and soft X-ray absorption in the low-redshift active galactic nucleus PG 1126-041.
WANG T.G., BRINKMANN W., WAMSTEKER W., YUAN W. and WANG J.X.
Abstract (from CDS):
The soft X-ray emission in the ROSAT band is weak. A simple power-law model yields a very poor fit with a UV-to-X-ray spectral index αUVX=2.3. Highly ionized (warm) absorption is suggested by the ROSAT data. After correcting for a warm absorber, the optical to X-ray spectral slope is close to the average of αUVX≃1.67 for radio-quiet quasars.
From photoionization calculations we find the following results. (1) A single-zone absorption model cannot explain simultaneously the UV absorption lines and the ionized X-ray absorption if metal abundances are solar. Furthermore, in order to be consistent with the equivalent width of the observed Lyα absorption line, the turbulent velocity of the warm absorber must be less than 190km.s–1, which imposes serious constraints on a disc wind model. (2) The UV absorption lines and their variability cannot be explained by a single-zone model with solar abundances and the large variability in the absorption lines suggests that Civ and Nv absorption lines are not severely saturated. (3) The absorption of the ionizing continuum by warm material strongly affects the emission-line spectrum.
Abstract Copyright: 1999, Royal Astronomical Society
Journal keyword(s): galaxies: individual: PG 1126-041 - quasars: absorption lines - quasars: emission lines - galaxies: Seyfert - X-rays: galaxies
CDS comments: in ref list HARTIG 1986ApJ...302...64H instead of 1990, KORISTA 1992ApJ ...401..529K instead of 1991
Simbad objects: 3
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