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XMM–Newton campaign on ultraluminous X-ray source NGC 1313 X-1: wind versus state variability

Pinto, C; Walton, DJ; Kara, E; Parker, ML; Soria, R; Kosec, P; Middleton, MJ; Alston, WN; Fabian, AC; Guainazzi, M; Roberts, TP; Fuerst, F; Earnshaw, HP; Sathyaprakash, R; Barret, D

XMM–Newton campaign on ultraluminous X-ray source NGC 1313 X-1: wind versus state variability Thumbnail


Authors

C Pinto

DJ Walton

E Kara

ML Parker

R Soria

P Kosec

MJ Middleton

WN Alston

AC Fabian

M Guainazzi

F Fuerst

HP Earnshaw

R Sathyaprakash

D Barret



Abstract

Most ultraluminous X-ray sources (ULXs) are thought to be powered by neutron stars and black holes accreting beyond the Eddington limit. If the compact object is a black hole or a neutron star with a magnetic field ≲1012 G, the accretion disc is expected to thicken and launch powerful winds driven by radiation pressure. Evidence of such winds has been found in ULXs through the high-resolution spectrometers onboardXMM–Newton, but several unknowns remain, such as the geometry and launching mechanism of these winds. In order to better understand ULX winds and their link to the accretion regime, we have undertaken a major campaign with XMM–Newton to study the ULX NGC 1313 X-1, which is known to exhibit strong emission and absorption features from a mildly relativistic wind. The new observations show clear changes in the wind with a significantly weakened fast component (0.2c) and the rise of a new wind phase which is cooler and slower (0.06–0.08c). We also detect for the first time variability in the emission lines which indicates an origin within the accretion disc or in the wind. We describe the variability of the wind in the framework of variable super-Eddington accretion rate and discuss a possible geometry for the accretion disc.

Citation

Pinto, C., Walton, D., Kara, E., Parker, M., Soria, R., Kosec, P., …Barret, D. (2020). XMM–Newton campaign on ultraluminous X-ray source NGC 1313 X-1: wind versus state variability. Monthly Notices of the Royal Astronomical Society, 492(4), 4646-4665. https://doi.org/10.1093/mnras/staa118

Journal Article Type Article
Acceptance Date Jan 12, 2020
Publication Date Mar 31, 2020
Deposit Date Feb 28, 2020
Publicly Available Date Mar 19, 2020
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 492
Issue 4
Pages 4646-4665
DOI https://doi.org/10.1093/mnras/staa118

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.





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