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An Iron K Component to the Ultrafast Outflow in NGC 1313 X-1

Walton, D. J. and Middleton, M. J. and Pinto, C. and Fabian, A. C. and Bachetti, M. and Barret, D. and Brightman, M. and Fuerst, F. and Harrison, F. A. and Miller, J. M. and Stern, D. (2016) An Iron K Component to the Ultrafast Outflow in NGC 1313 X-1. Astrophysical Journal Letters, 826 (2). Art. No. L26. ISSN 2041-8205. doi:10.3847/2041-8205/826/2/L26.

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We present the detection of an absorption feature at E = 8.77^(+0.05)_(-0.06) keV in the combined X-ray spectrum of the ultraluminous X-ray source NGC 1313 X-1 observed with XMM-Newton and NuSTAR, significant at the 3σ level. If associated with blueshifted ionized iron, the implied outflow velocity is ~0.2c for Fe xxvi, or ~0.25c for Fe xxv. These velocities are similar to the ultrafast outflow seen in absorption recently discovered in this source at lower energies by XMM-Newton, and we therefore conclude that this is an iron component to the same outflow. Photoionization modeling marginally prefers the Fe xxv solution, but in either case the outflow properties appear to be extreme, potentially supporting a super-Eddington hypothesis for NGC 1313 X-1.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Walton, D. J.0000-0001-5819-3552
Middleton, M. J.0000-0002-8183-2970
Pinto, C.0000-0003-2532-7379
Fabian, A. C.0000-0002-9378-4072
Bachetti, M.0000-0002-4576-9337
Barret, D.0000-0002-0393-9190
Brightman, M.0000-0002-8147-2602
Fuerst, F.0000-0003-0388-0560
Harrison, F. A.0000-0003-2992-8024
Stern, D.0000-0003-2686-9241
Additional Information:© 2016 The American Astronomical Society. Received 2016 June 30; revised 2016 July 6; accepted 2016 July 6; published 2016 July 29. The authors would like to thank the anonymous referee for their extremely timely and positive feedback, which helped improve the final manuscript. M.J.M. acknowledges support from an STFC Ernest Rutherford fellowship, C.P. and A.C.F. acknowledge support from ERC Advanced Grant 340442, and D.B. acknowledges financial support from the French Space Agency (CNES). This research has made use of data obtained with NuSTAR, a project led by Caltech, funded by NASA, and managed by NASA/JPL, and has utilized the NUSTARDAS software package, jointly developed by the ASDC (Italy) and Caltech (USA). This research has also made use of data obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States. Facilities: NuSTAR, XMM.
Group:Space Radiation Laboratory, NuSTAR
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
European Research Council (ERC)340442
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Subject Keywords:black hole physics – X-rays: binaries – X-rays: individual (NGC 1313 X-1)
Other Numbering System:
Other Numbering System NameOther Numbering System ID
Space Radiation Laboratory2016-51
Issue or Number:2
Record Number:CaltechAUTHORS:20160729-114600441
Persistent URL:
Official Citation:D. J. Walton et al 2016 ApJ 826 L26
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:69311
Deposited By: Tony Diaz
Deposited On:29 Jul 2016 18:55
Last Modified:11 Nov 2021 04:12

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