Gofford, J and Reeves, JN and McLaughlin, DE and Braito, V and Turner, TJ and Tombesi, F and Cappi, M (2015) The Suzaku view of highly-ionised outflows in AGN: II -- Location, energetics and scalings with Bolometric Luminosity. Monthly Notices of the Royal Astronomical Society, 451 (4). pp. 4169-4182. ISSN 1365-2966

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Abstract

Ongoing studies with XMM-Newton have shown that powerful accretion disc winds, as revealed through highly-ionised Fe\,K-shell absorption at E>=6.7 keV, are present in a significant fraction of Active Galactic Nuclei (AGN) in the local Universe (Tombesi et al. 2010). In Gofford et al. (2013) we analysed a sample of 51 Suzaku-observed AGN and independently detected Fe K absorption in ~40% of the sample, and we measured the properties of the absorbing gas. In this work we build upon these results to consider the properties of the associated wind. On average, the fast winds (v_out>0.01c) are located <r>~10^{15-18} cm (typically ~10^{2-4} r_s) from their black hole, their mass outflow rates are of the order <M_out>~0.01-1 Msun/yr or ~(0.01-1) M_edd and kinetic power is constrained to <L_k> ~10^{43-45} erg/s, equivalent to ~(0.1-10%) L_edd. We find a fundamental correlation between the source bolometric luminosity and the wind velocity, with v_out \propto L_bol^{\alpha} and \alpha=0.4^{+0.3}_{-0.2}$ (90% confidence), which indicates that more luminous AGN tend to harbour faster Fe K winds. The mass outflow rate M_out, kinetic power L_k and momentum flux P_out of the winds are also consequently correlated with L_bol, such that more massive and more energetic winds are present in more luminous AGN. We investigate these properties in the framework of a continuum-driven wind, showing that the observed relationships are broadly consistent with a wind being accelerated by continuum-scattering. We find that, globally, a significant fraction (~85%) of the sample can plausibly exceed the L_k/L_bol~0.5% threshold thought necessary for feedback, while 45% may also exceed the less conservative ~5% of L_bol threshold as well. This suggests that the winds may be energetically significant for AGN--host-galaxy feedback processes.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society © 2015 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: line: identification, galaxies: active, galaxies: nuclei, X-rays: galaxies
Subjects: Q Science > QB Astronomy
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 11 Nov 2015 12:14
Last Modified: 14 Nov 2017 11:02
URI: http://eprints.keele.ac.uk/id/eprint/1144

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