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A Potential Cyclotron Resonant Scattering Feature in the Ultraluminous X-Ray Source Pulsar NGC 300 ULX1 Seen by NuSTAR and XMM-Newton

Walton, D. J. and Bachetti, M. and Fürst, F. and Barret, D. and Brightman, M. and Fabian, A. C. and Grefenstette, B. W. and Harrison, F. A. and Heida, M. and Kennea, J. and Kosec, P. and Lau, R. M. and Madsen, K. K. and Middleton, M. J. and Pinto, C. and Steiner, J. F. and Webb, N. (2018) A Potential Cyclotron Resonant Scattering Feature in the Ultraluminous X-Ray Source Pulsar NGC 300 ULX1 Seen by NuSTAR and XMM-Newton. Astrophysical Journal Letters, 857 (1). Art. No. L3. ISSN 2041-8213. doi:10.3847/2041-8213/aabadc.

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Based on phase-resolved broadband spectroscopy using XMM-Newton and NuSTAR, we report on a potential cyclotron resonant scattering feature (CRSF) at E ~ 13 keV in the pulsed spectrum of the recently discovered ultraluminous X-ray source (ULX) pulsar NGC 300 ULX1. If this interpretation is correct, the implied magnetic field of the central neutron star is B ~ 1012 G (assuming scattering by electrons), similar to that estimated from the observed spin-up of the star, and also similar to known Galactic X-ray pulsars. We discuss the implications of this result for the connection between NGC 300 ULX1 and the other known ULX pulsars, particularly in light of the recent discovery of a likely proton cyclotron line in another ULX, M51 ULX-8.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Walton, D. J.0000-0001-5819-3552
Bachetti, M.0000-0002-4576-9337
Fürst, F.0000-0003-0388-0560
Barret, D.0000-0002-0393-9190
Brightman, M.0000-0002-8147-2602
Fabian, A. C.0000-0002-9378-4072
Grefenstette, B. W.0000-0002-1984-2932
Harrison, F. A.0000-0003-2992-8024
Heida, M.0000-0002-1082-7496
Kennea, J.0000-0002-6745-4790
Madsen, K. K.0000-0003-1252-4891
Middleton, M. J.0000-0002-8183-2970
Pinto, C.0000-0003-2532-7379
Steiner, J. F.0000-0002-5872-6061
Alternate Title:A Potential Cyclotron Resonant Scattering Feature in the ULX Pulsar NGC 300 ULX1 seen by NuSTAR and XMM-Newton
Additional Information:© 2018. The American Astronomical Society. Received 2018 March 20; revised 2018 March 27; accepted 2018 March 29; published 2018 April 9. The authors would like to thank the reviewer for timely and positive feedback. D.J.W. and M.J.M. acknowledge support from STFC Ernest Rutherford fellowships. A.C.F. acknowledges ERC Advanced Grant 340442, P.K. acknowledges support from the STFC, and D.B. acknowledges 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 work 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 - The NuSTAR (Nuclear Spectroscopic Telescope Array) mission, XMM - Newton X-Ray Multimirror Mission satellite.
Group:Space Radiation Laboratory, NuSTAR, Astronomy Department
Funding AgencyGrant Number
Science and Technology Facilities Council (STFC)UNSPECIFIED
European Research Council (ERC)340442
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Subject Keywords:stars: neutron; X-rays: binaries; X-rays: individual (NGC 300 ULX1)
Issue or Number:1
Record Number:CaltechAUTHORS:20180325-185226577
Persistent URL:
Official Citation:D. J. Walton et al 2018 ApJL 857 L3
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:85431
Deposited By: Joy Painter
Deposited On:26 Mar 2018 20:00
Last Modified:15 Nov 2021 20:28

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