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Title: UV line driven disc wind as the origin of ultrafast outflows in AGN
Authors: Mizumoto, Misaki  kyouindb  KAKEN_id  orcid (unconfirmed)
Nomura, Mariko
Done, Chris
Ohsuga, Ken
Odaka, Hirokazu
Author's alias: 水本, 岬希
野村, 真理子
大須賀, 健
小高, 裕和
Keywords: galaxies: active
galaxies: Seyfert
galaxies: individual: PG 1211+143
X-rays: galaxies
Issue Date: 1-May-2020
Publisher: Oxford University Press (OUP)
Journal title: Monthly Notices of the Royal Astronomical Society
Volume: 503
Issue: 1
Start page: 1442
End page: 1458
Thesis number: staa3282
Abstract: UltraFast Outflows (UFO) are observed in some active galactic nuclei (AGN), with blueshifted and highly ionised Fe-K absorption features. AGN typically have a UV bright accretion flow, so UV line driving is an obvious candidate for launching these winds. However this mechanism requires material with UV opacity, in apparent conflict with the observed high ionisation state of the wind. In this paper we synthesise the X-ray energy spectra resulting from different lines of sight through a state of the art radiation hydrodynamics UV line driven disc wind simulation. We demonstrate that there are some lines of sight which only intercept highly ionised and fast outflowing material. The cooler material required for the UV line driving acceleration is out of the line of sight, close to the disc, shielded from the X-rays by a failed wind. We fit these simulated wind spectra to data from the archetypal UFO source PG 1211+143 and show that they broadly reproduce the depth and velocity of the iron absorption lines seen. This directly demonstrates that UV line driving is a viable mechanism to launch even the fastest UFOs. We simulate microcalorimeter observations of this wind and show that their high energy resolution can resolve the detailed structure in the wind and recover the wind energetics when combined with models which correctly estimate the line formation radius of the wind. New data from microcalorimeters will pave the way for physical predictions of AGN wind feedback in cosmological simulations.
Description: 超巨大ブラックホールから吹く「風」の謎を解明. 京都大学プレスリリース. 2020-11-19.
Rights: © 2021 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (
DOI(Published Version): 10.1093/mnras/staa3282
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