A New Relativistic Component of the Accretion Disk Wind in PDS 456

Abstract

Past X-ray observations of the nearby luminous quasar PDS 456 (at z = 0.184) have revealed a wide angle accretion disk wind, with an outflow velocity of ~-0.25 c . Here, we unveil a new, relativistic component of the wind through hard X-ray observations with NuSTAR and XMM-Newton , obtained in 2017 March when the quasar was in a low-flux state. This very fast wind component, with an outflow velocity of -0.46 ± 0.02 c , is detected in the iron K band, in addition to the -0.25 c wind zone. The relativistic component may arise from the innermost disk wind, launched from close to the black hole at a radius of ~10 gravitational radii. The opacity of the fast wind also increases during a possible obscuration event lasting for 50 ks. We suggest that the very fast wind may only be apparent during the lowest X-ray flux states of PDS 456, becoming overly ionized as the luminosity increases. Overall, the total wind power may even approach the Eddington value.

Citation

(2018). A New Relativistic Component of the Accretion Disk Wind in PDS 456. Astrophysical Journal Letters, L8 -?. https://doi.org/10.3847/2041-8213/aaaae1

• Acceptance Date: Jan 26, 2018
• Publication Date: Feb 8, 2018
• Journal: Astrophysical Journal Letters
• Print ISSN: 2041-8205
• Publisher: American Astronomical Society
• Pages: L8 -?
• DOI: https://doi.org/10.3847/2041-8213/aaaae1
• Keywords: black hole physics, galaxies, active, quasars, individual (PDS 456), X-rays
• Publisher URL: http://dx.doi.org/10.3847/2041-8213/aaaae1