Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 857, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.3847/2041-8213/aabadc
Keywords
stars: neutron; X-rays: binaries; X-rays: individual (NGC 300 ULX1)
Categories
Funding
- STFC Ernest Rutherford fellowships
- ERC [340442]
- French Space Agency (CNES)
- NASA
- ESA Member States
- STFC [ST/M005283/2] Funding Source: UKRI
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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 similar to 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 similar to 10(12) 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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