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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

A potential cyclotron resonant scattering feature in the ultraluminous x-ray source pulsar NGC 300 ULX1 seen by NuSTAR and XMM-Newton
A potential cyclotron resonant scattering feature in the ultraluminous x-ray source pulsar NGC 300 ULX1 seen by NuSTAR and XMM-Newton
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.
2041-8205
Walton, D.J.
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Bachetti, M.
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Fürst, F.
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Barret, D.
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Brightman, M.
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Fabian, A.C.
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Grefenstette, B.W.
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Harrison, F.A.
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Heida, M.
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Kennea, J.A.
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Lau, R.M.
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Madsen, K.K.
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Middleton, M.J.
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Pinto, C.
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Steinert, J.
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Webb, N.
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Walton, D.J.
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Bachetti, M.
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Fürst, F.
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Barret, D.
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Brightman, M.
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Fabian, A.C.
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Grefenstette, B.W.
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Harrison, F.A.
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Heida, M.
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Kennea, J.A.
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Lau, R.M.
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Madsen, K.K.
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Middleton, M.J.
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Pinto, C.
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Steinert, J.
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Webb, N.
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Walton, D.J., Bachetti, M., Fürst, F., Barret, D., Brightman, M., Fabian, A.C., Grefenstette, B.W., Harrison, F.A., Heida, M., Kennea, J.A., Lau, R.M., Madsen, K.K., Middleton, M.J., Pinto, C., Steinert, J. 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. The Astrophysical Journal Letters, 857 (1), [L3]. (doi:10.3847/2041-8213/aabadc).

Record type: Article

Abstract

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.

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A POTENTIAL CYCLOTRON RESONANT SCATTERING FEATURE IN THE ULX PULSAR NGC 300 ULX1 SEEN BY - Accepted Manuscript
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Accepted/In Press date: 29 March 2018
e-pub ahead of print date: 9 April 2018

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Local EPrints ID: 420310
URI: http://eprints.soton.ac.uk/id/eprint/420310
ISSN: 2041-8205
PURE UUID: bbe8464f-04a7-4ccd-bce3-193004e0bc17

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Date deposited: 04 May 2018 16:30
Last modified: 17 Dec 2019 05:27

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Contributors

Author: D.J. Walton
Author: M. Bachetti
Author: F. Fürst
Author: D. Barret
Author: M. Brightman
Author: A.C. Fabian
Author: B.W. Grefenstette
Author: F.A. Harrison
Author: M. Heida
Author: J.A. Kennea
Author: R.M. Lau
Author: K.K. Madsen
Author: M.J. Middleton
Author: C. Pinto
Author: J. Steinert
Author: N. Webb

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