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

XMM-Newton campaign on ultraluminous X-ray source NGC 1313 X-1: wind versus state variability
XMM-Newton campaign on ultraluminous X-ray source NGC 1313 X-1: wind versus state variability
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 onboard XMM–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.
0035-8711
Pinto, C.
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Walton, D.J.
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Kara, E.
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Parker, M.L.
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R., Soria
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Kosec, P.
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Middleton, Matthew
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Alston, W.N.
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Fabian, A.C.
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Guainazzi, M.
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Roberts, T.P.
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Fuerst, F.
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Earnshaw, H.P.
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Sathyaprakash, R.
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Barret, D.
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Pinto, C.
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Walton, D.J.
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Kara, E.
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Parker, M.L.
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R., Soria
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Kosec, P.
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Middleton, Matthew
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Alston, W.N.
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Fabian, A.C.
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Guainazzi, M.
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Roberts, T.P.
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Fuerst, F.
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Earnshaw, H.P.
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Sathyaprakash, R.
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Barret, D.
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Pinto, C., Walton, D.J., Kara, E., Parker, M.L., R., Soria, Kosec, P., Middleton, Matthew, Alston, W.N., Fabian, A.C., Guainazzi, M., Roberts, T.P., Fuerst, F., Earnshaw, H.P., Sathyaprakash, R. and 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. (doi:10.1093/mnras/staa118).

Record type: Article

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 onboard XMM–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.

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XMM-Newton campaign on ultraluminous X-ray source NGC 1313 X-1 wind versus state variability - Accepted Manuscript
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Accepted/In Press date: 12 January 2020
e-pub ahead of print date: 15 January 2020
Additional Information: arXiv is AM

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Local EPrints ID: 439447
URI: http://eprints.soton.ac.uk/id/eprint/439447
ISSN: 0035-8711
PURE UUID: 5824b6b0-1d80-4e42-8bd1-94899855abc3

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Date deposited: 23 Apr 2020 16:33
Last modified: 06 Oct 2020 22:53

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Contributors

Author: C. Pinto
Author: D.J. Walton
Author: E. Kara
Author: M.L. Parker
Author: Soria R.
Author: P. Kosec
Author: W.N. Alston
Author: A.C. Fabian
Author: M. Guainazzi
Author: T.P. Roberts
Author: F. Fuerst
Author: H.P. Earnshaw
Author: R. Sathyaprakash
Author: D. Barret

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