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

Pinto, C. and Walton, D. J. and Kara, E. and Parker, M. L. and Soria, R. and Kosec, P. and Middleton, M. J. and Alston, W. N. and Fabian, A. C. and Guainazzi, M. and Roberts, T. P. and Fuerst, F. and Earnshaw, H. P. and 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, 492 (4). pp. 4646-4665. ISSN 0035-8711. doi:10.1093/mnras/staa118.

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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.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Pinto, C.0000-0003-2532-7379
Walton, D. J.0000-0001-5819-3552
Kara, E.0000-0003-0172-0854
Parker, M. L.0000-0002-8466-7317
Soria, R.0000-0002-4622-796X
Middleton, M. J.0000-0002-8183-2970
Alston, W. N.0000-0003-2658-6559
Fabian, A. C.0000-0002-9378-4072
Roberts, T. P.0000-0001-8252-6337
Fuerst, F.0000-0003-0388-0560
Earnshaw, H. P.0000-0001-5857-5622
Sathyaprakash, R.0000-0002-5254-3969
Barret, D.0000-0002-0393-9190
Alternate Title:XMM-Newton Campaign On Ultraluminous X-ray Source NGC 1313 X-1: Wind vs. State Variability
Additional Information:© 2020 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 ( Received: 08 November 2019; Revision received: 19 December 2019; Accepted: 12 January 2020; Published: 15 January 2020. This work is based on observations obtained with XMM–Newton, an ESA science mission funded by ESA Member States and USA (NASA). CP, MP, and FF are supported by European Space Agency (ESA) Research Fellowships. We acknowledge support from STFC and ERC Advanced Grant Feedback 340442 and the European Union’s Horizon 2020 Programme under the AHEAD AO5 project (grant agreement n. 654215). We also thank J. de Plaa and M. Mehdipour for support in optimizing SPEX and I. Psaradaki for help with PYTHON. We thank the XMM–Newton SOC and, in particular, Jan-Uwe Ness for excellent support in optimizing our observing campaign. We finally acknowledge the anonymous referee for useful comments that improved the clarity of the paper.
Group:Space Radiation Laboratory
Funding AgencyGrant Number
European Space Agency (ESA)UNSPECIFIED
Science and Technology Facilities Council (STFC)UNSPECIFIED
European Research Council (ERC)340442
European Research Council (ERC)654215
Subject Keywords:accretion, accretion discs, X-rays: binaries, X-rays: individual: NGC 1313 X-1
Issue or Number:4
Record Number:CaltechAUTHORS:20200326-143435397
Persistent URL:
Official Citation:C Pinto, D J Walton, E Kara, M L Parker, R Soria, P Kosec, M J Middleton, W N Alston, A C Fabian, M Guainazzi, T P Roberts, F Fuerst, H P Earnshaw, R Sathyaprakash, D Barret, XMM–Newton campaign on ultraluminous X-ray source NGC 1313 X-1: wind versus state variability, Monthly Notices of the Royal Astronomical Society, Volume 492, Issue 4, March 2020, Pages 4646–4665,
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:102129
Deposited By: Tony Diaz
Deposited On:27 Mar 2020 02:59
Last Modified:16 Nov 2021 18:09

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