Reeves, JN and Braito, V and Nardini, E and Lobban, AP and Matzeu, GA and Costa, MT (2018) A New Relativistic Component of the Accretion Disk Wind in PDS 456. Astrophysical Journal Letters, 854 (1). L8 -?. ISSN 2041-8213

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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.

Item Type: Article
Additional Information: © IOP Publishing. This is the final published version of the article (version of record). It first appeared online via IOP Publishing at http://dx.doi.org/10.3847/2041-8213/aaaae1 - please refer to any applicable terms of use of the publisher.
Uncontrolled Keywords: black hole physics, galaxies, active, quasars, individual (PDS 456), X-rays
Subjects: Q Science > QB Astronomy > QB460 Astrophysics
Divisions: Faculty of Natural Sciences > School of Chemical and Physical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 14 Feb 2018 13:51
Last Modified: 14 Feb 2018 13:58
URI: http://eprints.keele.ac.uk/id/eprint/4446

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