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.

摘要: We present results from a homogeneous analysis of the broadband 0.3-10 keV CCD resolution as well soft X-ray high-resolution grating spectra hard flux-limited sample 26 Seyfert galaxies observed with XMM-Newton. Our goal is to characterise warm absorber (WA) properties along line-of-sight active nucleus. significantly detect WAs in $65\%$ sources. are consistent being at least half nearby Universe, agreement previous estimates . find gap distribution ionisation parameter range $0.5<\log\xi<1.5$ which we interpret thermally unstable region for WA clouds. This may indicate that flow probably constituted by clumpy discrete clouds rather than continuous medium. The column densities sources broad Fe K$\alpha$ lines similar those do not have broadened emission lines. Therefore detected bonafide and artifacts ionised absorption X-rays. parameters show no correlation among themselves, exception versus density. shallow slope $\log\xi$ $\log v_{\rm out}$ linear regression ($0.12\pm 0.03$) inconsistent scaling laws predicted radiation or magneto-hydrodynamic-driven winds. suggest also Ultra Fast Outflows (UFOs) represent extreme manifestation same astrophysical system.