The Connection between Ultraviolet and X-ray Outflows in AGN: the case of PDS 456

Abstract

High-velocity outflows from AGN are a well-known phenomena in terms of the Broad Absorption Lines seen in the UV/optical. More recently, similar, possibly related, outflows have been reported in the X-ray. The most extreme example is seen in the nearby, luminous QSO PDS 456, which displays a massive, high velocity (50000 km s-1), high-ionization X-ray outflow of 10 solar masses yr-1. Here we present the UV spectrum of PDS 456 as observed by the Hubble Space Telescope. We find the UV spectrum is also extreme, displaying very broad emission-lines, with CIV 1549 blueshifted by 5000 km s-1 and a broad Ly-alpha absorption trough blueshifted by 14000-24000 km s-1. No strong, broad high-ionization absorption features are seen. We interpret the combined UV and X-ray spectrum of PDS 456 as the signature of a decelerating, cooling outflow, which may be driven by radiation and/or magnetic field. This outflow may be the source of some of the broad emission and absorption-line gas.

Accepted for publication in MNRAS. 6 pages. 6 figures

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• The impact of accretion disk winds on the X-ray spectrum of AGN: Part 2 - XSCORT + Hydrodynamic Simulations
• Metal enrichment processes
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• The mass-energy budget of the ionised outflow in NGC 7469
• Does the X-ray outflow quasar PDS 456 have a UV outflow at 0.3c?
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• Revealing the X-ray Variability of AGN with Principal Component Analysis
• Discovery of Broad Soft X-ray Absorption Lines from the Quasar Wind in PDS 456
• Variability of the High Velocity Outflow in the Quasar PDS 456
• Revealing the location and structure of the accretion disk-wind in PDS456
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• Sensitive Chandra coverage of a representative sample of weak-line quasars: revealing the full range of X-ray properties
• Anisotropic AGN Outflows and Enrichment of the Intergalactic Medium
• Relativistic components of the Ultra-Fast Outflow in the Quasar PDS 456 from Chandra/HETGS, NuSTAR and XMM-Newton observations
• Remarkable Spectral Variability of PDS 456
• Active Galactic Nuclei with Ultra-fast Outflows Monitoring Project: The Broad-line Region of Mrk 79 as a Disk Wind
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• Resolving the X-ray obscuration in a low flux observation of the quasar PDS 456
• X-ray observations of powerful AGN outflows - implications for feedback
• Towards an informed quest for accretion disc winds in quasars: the intriguing case of Ton 28
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• MUSE view of PDS 456: kpc-scale wind, extended ionized gas and close environment
• The WISSH quasars project VII. The impact of extreme radiative field in the accretion disk and X-ray corona interplay