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.
- Bachetti, M.
- Furst, F.
- Barret, D.
- Brightman, M.
- Fabian, A.C.
- Grefenstette, B.W.
- Harrison, F.A.
- Heida, M.
- Kennea, J.
- Kosec, P.
- Lau, R.M.
- Madsen, K.K.
- Middleton, M.J.
- Pinto, C.
- Steiner, J.F.
- Webb, N.
DOIAbstract
International audienceBased 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 UL...
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