First detection of an ultra-fast outflow (v≈0.07c) in a quiescent galaxy quenched ~9 Gyr ago, suggesting AGN winds can maintain quiescence independent of global star formation.
A Compton-thick Wind in the High Luminosity Quasar, PDS 456
4 Pith papers cite this work. Polarity classification is still indexing.
4
Pith papers citing it
abstract
PDS 456 is a nearby (z=0.184), luminous (L_bol ~10^47 erg/s) type I quasar. A deep 190 ks Suzaku observation in February 2007 revealed the complex, broad band X-ray spectrum of PDS 456. The Suzaku spectrum exhibits highly statistically significant absorption features near 9 keV in the quasar rest--frame. We show that the most plausible origin of the absorption is from blue-shifted resonance (1s-2p) transitions of hydrogen-like iron (at 6.97 keV in the rest frame). This indicates that a highly ionized outflow may be present moving at near relativistic velocities (~0.25c). A possible hard X-ray excess is detected above 15 keV with HXD (at 99.8% confidence), which may arise from high column density gas (Nh>10^24cm^-2) partially covering the X-ray emission, or through strong Compton reflection. Here we propose that the iron K-shell absorption in PDS 456 is associated with a thick, possibly clumpy outflow, covering about 20% of $4\pi$ steradian solid angle. The outflow is likely launched from the inner accretion disk, within 15-100 gravitational radii of the black hole. The kinetic power of the outflow may be similar to the bolometric luminosity of PDS 456. Such a powerful wind could have a significant effect on the co-evolution of the host galaxy and its supermassive black hole, through feedback.
years
2026 4representative citing papers
Two weak X-ray absorption features in quasar WISEA J094835.95+432302.6 at z=1.893 are best explained as iron K-shell lines from gas falling into the supermassive black hole at roughly one third of the speed of light.
Variable column density and covering factor of three ionized absorbers in clumpy disk winds explain the X-ray variability in I Zw 1 with stable corona.
A review of AGN unification concluding that whether a black-hole-powered nucleus appears obscured depends on inclination, Eddington ratio (radiative feedback), and host-galaxy merger/redshift evolution.
citing papers explorer
-
First detection of ultra-fast outflows in a quiescent galaxy
First detection of an ultra-fast outflow (v≈0.07c) in a quiescent galaxy quenched ~9 Gyr ago, suggesting AGN winds can maintain quiescence independent of global star formation.
-
A relativistic inflow candidate in a quasar at cosmic noon
Two weak X-ray absorption features in quasar WISEA J094835.95+432302.6 at z=1.893 are best explained as iron K-shell lines from gas falling into the supermassive black hole at roughly one third of the speed of light.
-
Strong X-ray Variability of I Zwicky 1: Obscuration from Clumpy Accretion-Disk Winds
Variable column density and covering factor of three ionized absorbers in clumpy disk winds explain the X-ray variability in I Zw 1 with stable corona.
-
Unification models of Active Galactic Nuclei
A review of AGN unification concluding that whether a black-hole-powered nucleus appears obscured depends on inclination, Eddington ratio (radiative feedback), and host-galaxy merger/redshift evolution.