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).
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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