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Ultrafast outflows in ultraluminous X-ray sources

Ultrafast outflows in ultraluminous X-ray sources
Ultrafast outflows in ultraluminous X-ray sources
Ultraluminous X-ray sources (ULXs) are bright extragalactic sources with X-ray luminosities above 1039 erg s−1 powered by accretion onto compact objects. According to the first studies performed with XMM-Newton, ULXs seemed to be excellent candidates to host intermediate-mass black holes (102 − 4M⊙). However, in the last years, the interpretation of super-Eddington accretion onto stellar-mass black holes or neutron stars for most ULXs has gained a strong consensus. One critical missing piece to confirm the super-Eddington scenario was the direct detection of the massive, radiatively driven winds expected as atomic emission/absorption lines in the ULX spectra. The first evidence for winds was found as residuals in the soft X-ray spectra of ULXs. Very recently, we have been able to resolve these residuals into rest-frame emission and blueshifted (∼ 0.2c) absorption lines arising from highly ionized gas in the deep, high-resolution XMM-Newton spectra of two ULXs. The compact object is therefore surrounded by powerful ultrafast winds as predicted by models of hyper-Eddington accretion. Here we discuss the relevance of these discoveries and the importance of further deep XMM-Newton observations of powerful winds in many other ULXs to estimate the energetics of the wind, the geometry of the system, and the masses of the central accretors.
0004-6337
234-240
Pinto, C.
9d6e45cf-4900-42c4-8ca0-134c0af99af2
Fabian, A.
0c353376-f159-4129-b03e-d3993c0c5406
Middleton, M.
f91b89d9-fd2e-42ec-aa99-1249f08a52ad
Walton, D.
a1a36b18-a77b-48e8-8665-45bbef0c7bd1
Pinto, C.
9d6e45cf-4900-42c4-8ca0-134c0af99af2
Fabian, A.
0c353376-f159-4129-b03e-d3993c0c5406
Middleton, M.
f91b89d9-fd2e-42ec-aa99-1249f08a52ad
Walton, D.
a1a36b18-a77b-48e8-8665-45bbef0c7bd1

Pinto, C., Fabian, A., Middleton, M. and Walton, D. (2017) Ultrafast outflows in ultraluminous X-ray sources. Astronomische Nachrichten, 338 (2-3), 234-240. (doi:10.1002/asna.201713336).

Record type: Article

Abstract

Ultraluminous X-ray sources (ULXs) are bright extragalactic sources with X-ray luminosities above 1039 erg s−1 powered by accretion onto compact objects. According to the first studies performed with XMM-Newton, ULXs seemed to be excellent candidates to host intermediate-mass black holes (102 − 4M⊙). However, in the last years, the interpretation of super-Eddington accretion onto stellar-mass black holes or neutron stars for most ULXs has gained a strong consensus. One critical missing piece to confirm the super-Eddington scenario was the direct detection of the massive, radiatively driven winds expected as atomic emission/absorption lines in the ULX spectra. The first evidence for winds was found as residuals in the soft X-ray spectra of ULXs. Very recently, we have been able to resolve these residuals into rest-frame emission and blueshifted (∼ 0.2c) absorption lines arising from highly ionized gas in the deep, high-resolution XMM-Newton spectra of two ULXs. The compact object is therefore surrounded by powerful ultrafast winds as predicted by models of hyper-Eddington accretion. Here we discuss the relevance of these discoveries and the importance of further deep XMM-Newton observations of powerful winds in many other ULXs to estimate the energetics of the wind, the geometry of the system, and the masses of the central accretors.

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Ultrafast outflows in ultraluminous X-ray sources - Accepted Manuscript
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Accepted/In Press date: 2 November 2016
e-pub ahead of print date: 29 March 2017
Additional Information: Arxiv ref 1611.00623 Author confirms AM
Venue - Dates: XXM-Newton: The Next Decade, Spain, 2016-05-09 - 2016-05-11
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 412017
URI: http://eprints.soton.ac.uk/id/eprint/412017
ISSN: 0004-6337
PURE UUID: 6a929446-d98f-4c98-a533-c686ec741d1f

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Date deposited: 05 Jul 2017 16:31
Last modified: 07 Oct 2020 05:33

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