Matches in SemOpenAlex for { <https://semopenalex.org/work/W1994637039> ?p ?o ?g. }
- W1994637039 endingPage "2643" @default.
- W1994637039 startingPage "2613" @default.
- W1994637039 abstract "We present results from a homogeneous analysis of the broadband 0.3-10 keV CCD resolution as well as of soft X-ray high-resolution grating spectra of a hard X-ray flux-limited sample of 26 Seyfert galaxies observed with XMM-Newton. Our goal is to characterise the warm absorber (WA) properties along the line-of-sight to the active nucleus. We significantly detect WAs in $65%$ of the sample sources. Our results are consistent with WAs being present in at least half of the Seyfert galaxies in the nearby Universe, in agreement with previous estimates . We find a gap in the distribution of the ionisation parameter in the range $0.5<logxi<1.5$ which we interpret as a thermally unstable region for WA clouds. This may indicate that the warm absorber flow is probably constituted by a clumpy distribution of discrete clouds rather than a continuous medium. The distribution of the WA column densities for the sources with broad Fe K$alpha$ lines are similar to those sources which do not have broadened emission lines. Therefore the detected broad Fe K$alpha$ emission lines are bonafide and not artifacts of ionised absorption in the soft X-rays. The WA parameters show no correlation among themselves, with the exception of the ionisation parameter versus column density. The shallow slope of the $logxi$ versus $log v_{rm out}$ linear regression ($0.12pm 0.03$) is inconsistent with the scaling laws predicted by radiation or magneto-hydrodynamic-driven winds. Our results suggest also that WA and Ultra Fast Outflows (UFOs) do not represent extreme manifestation of the same astrophysical system." @default.
- W1994637039 created "2016-06-24" @default.
- W1994637039 creator A5019444007 @default.
- W1994637039 creator A5029001246 @default.
- W1994637039 creator A5049154731 @default.
- W1994637039 creator A5053632005 @default.
- W1994637039 creator A5090694497 @default.
- W1994637039 date "2014-05-20" @default.
- W1994637039 modified "2023-09-30" @default.
- W1994637039 title "Warm absorbers in X-rays (WAX), a comprehensive high-resolution grating spectral study of a sample of Seyfert galaxies - I. A global view and frequency of occurrence of warm absorbers." @default.
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