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Unification of x-ray winds in seyfert galaxies: from ultra-fast outflows to warm absorbers
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Tombesi, F. Braito, V. Nemmen, R. S. Gaspari, M. Reeves, J. N. Reynolds, C. S. Cappi, M. |
| Copyright Year | 2013 |
| Description | The existence of ionized X-ray absorbing layers of gas along the line of sight to the nuclei||||of Seyfert galaxies is a well established observational fact. This material is systematically||||outflowing and shows a large range in parameters. However, its actual nature and dynamics||||are still not clear. In order to gain insights into these important issues we performed a literature||||search for papers reporting the parameters of the soft X-ray warm absorbers (WAs) in 35 type||||1 Seyferts and compared their properties to those of the ultra-fast outflows (UFOs) detected in||||the same sample. The fraction of sources with WAs is >60 per cent, consistent with previous||||studies. The fraction of sources with UFOs is >34 per cent, >67 per cent of which also||||show WAs. The large dynamic range obtained when considering all the absorbers together,||||spanning several orders of magnitude in ionization, column, velocity and distance allows us,||||for the first time, to investigate general relations among them. In particular, we find significant||||correlations indicating that the closer the absorber is to the central black hole, the higher the||||ionization, column, outflow velocity and consequently the mechanical power. In all the cases,||||the absorbers continuously populate the whole parameter space, with the WAs and the UFOs||||lying always at the two ends of the distribution. These evidence strongly suggest that these||||absorbers, often considered of different types, could actually represent parts of a single large-scale||||stratified outflow observed at different locations from the black hole. The UFOs are likely||||launched from the inner accretion disc and the WAs at larger distances, such as the outer disc||||and/or torus. We argue that the observed parameters and correlations are, to date, consistent||||with both radiation pressure through Compton scattering and magnetohydrodynamic processes||||contributing to the outflow acceleration, the latter playing a major role. Most of the absorbers,||||especially the UFOs, show a sufficiently high mechanical power (at least approx 0.5 per cent of the||||bolometric luminosity) to provide a significant contribution to active galactic nuclei (AGN)||||feedback and thus to the evolution of the host galaxy. In this regard, we find possible evidence||||for the interaction of the AGN wind with the surrounding environment on large scales. |
| File Size | 1658866 |
| Page Count | 16 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_20140010416 |
| Archival Resource Key | ark:/13960/t37132f8s |
| Language | English |
| Publisher Date | 2013-04-01 |
| Access Restriction | Open |
| Subject Keyword | Unification Seyfert X-ray Winds Seyfert Galaxies Active Galactic Nuclei X Rays Accretion Disks Galactic Radiation Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
