Understanding the spectral and timing behaviour of a newly discovered transient X-ray pulsar Swift J0243.6+6124

Gaurava K. Jaisawal, Sachindra Naik, Jérôme Chenevez*

*Corresponding author for this work

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Abstract

We present the results obtained from timing and spectral studies of the newly discovered accreting X-ray binary pulsar Swift J0243.6+6124 using Nuclear Spectroscopy Telescope Array observation in 2017 October at a flux level of ~280 mCrab. Pulsations at 9.854 23(5) s were detected in the X-ray light curves of the pulsar. Pulse profiles of the pulsar were found to be strongly energy dependent. A broad profile at lower energies was found to evolve into a double-peaked profile in ≥ 30 keV. The 3-79 keV continuum spectrum of the pulsar was well described with a negative and positive exponential cutoff or high-energy cutoff power-law models modified with a hot blackbody at ~3 keV. An iron emission line was also detected at 6.4 keV in the source spectrum. We did not find any signature of cyclotron absorption line in our study. Results obtained from phase-resolved and time-resolved spectroscopy are discussed in the paper.
Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society
Volume474
Issue number4
Pages (from-to)4432-4437
ISSN0035-8711
DOIs
Publication statusPublished - 2018

Keywords

  • X-rays: stars
  • Pulsars: individual: Swift J0243.6+6124
  • Stars: neutron

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