An Evolving Broad Iron Line from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124

@article{Jaisawal2019AnEB,
  title={An Evolving Broad Iron Line from the First Galactic Ultraluminous X-Ray Pulsar Swift J0243.6+6124},
  author={Gaurava K. Jaisawal and Colleen A. Wilson-Hodge and Andrew C. Fabian and Sachindra Naik and Deepto Chakrabarty and Peter Kretschmar and David R. Ballantyne and Renee M. Ludlam and J{\'e}r{\^o}me Chenevez and Diego Altamirano and Zaven Arzoumanian and Felix S. F{\"u}rst and Keith C. Gendreau and Sebastien Guillot and Christian Malacaria and Jonathan M. Miller and Abigail L. Stevens and Michael T. Wolff},
  journal={The Astrophysical Journal},
  year={2019},
  volume={885}
}
We present a spectral study of the ultraluminous Be/X-ray transient pulsar Swift J0243.6+6124 using Neutron Star Interior Composition Explorer (NICER) observations during the system’s 2017–2018 giant outburst. The 1.2–10 keV energy spectrum of the source can be approximated with an absorbed cutoff power-law model. We detect strong, luminosity-dependent emission lines in the 6–7 keV energy range. A narrow 6.42 keV line, observed in the sub-Eddington regime, is seen to evolve into a broad Fe-line… 
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