X-ray high-resolution spectroscopy reveals feedback in a Seyfert galaxy
  from an ultra fast wind with complex ionization and velocity structure
  Winds outflowing from Active Galactic Nuclei (AGNs) may carry significant
amount of mass and energy out to their host galaxies. In this paper we report
the detection of a sub-relativistic outflow observed in the Narrow Line Seyfert
1 Galaxy IRAS17020+4544 as a series of absorption lines corresponding to at
least 5 absorption components with an unprecedented wide range of associated
column densities and ionization levels and velocities in the range of
23,000-33,000 km/s, detected at X-ray high spectral resolution (E/Delta E
~1000) with the ESA's observatory XMM-Newton. The charge states of the material
constituting the wind clearly indicate a range of low to moderate ionization
states in the outflowing gas and column densities significantly lower than
observed in highly ionized ultra fast outflows. We estimate that at least one
of the outflow components may carry sufficient energy to substantially suppress
star formation, and heat the gas in the host galaxy. IRAS17020+4544 provides
therefore an interesting example of feedback by a moderately luminous AGN
hosted in a spiral galaxy, a case barely envisaged in most evolution models,
which often predict that feedback processes take place in massive elliptical
galaxies hosting luminous quasars in a post merger phase.
