A Potential Cyclotron Resonant Scattering Feature in the Ultraluminous X-Ray Source Pulsar NGC 300 ULX1 Seen by NuSTAR and XMM-Newton
Date Issued
2018
Author(s)
Walton, D. J.
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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.
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Kosec, P.
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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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Steiner, J. F.
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Webb, N.
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.
Volume
857
Issue
1
Start page
L3
Issn Identifier
2041-8205
Ads BibCode
2018ApJ...857L...3W
Rights
open.access
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