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

Research output: Contribution to journalJournal articleResearchpeer-review

150 Downloads (Pure)

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

Cite this

@article{6a9952088bc747539a22f2c233c079da,
title = "Understanding the spectral and timing behaviour of a newly discovered transient X-ray pulsar Swift J0243.6+6124",
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.",
keywords = "X-rays: stars, Pulsars: individual: Swift J0243.6+6124 , Stars: neutron",
author = "Jaisawal, {Gaurava K.} and Sachindra Naik and J{\'e}r{\^o}me Chenevez",
year = "2018",
doi = "10.1093/mnras/stx3082",
language = "English",
volume = "474",
pages = "4432--4437",
journal = "Royal Astronomical Society. Monthly Notices",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "4",

}

Understanding the spectral and timing behaviour of a newly discovered transient X-ray pulsar Swift J0243.6+6124. / Jaisawal, Gaurava K.; Naik, Sachindra; Chenevez, Jérôme.

In: Monthly Notices of the Royal Astronomical Society, Vol. 474, No. 4, 2018, p. 4432-4437.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Understanding the spectral and timing behaviour of a newly discovered transient X-ray pulsar Swift J0243.6+6124

AU - Jaisawal, Gaurava K.

AU - Naik, Sachindra

AU - Chenevez, Jérôme

PY - 2018

Y1 - 2018

N2 - 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.

AB - 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.

KW - X-rays: stars

KW - Pulsars: individual: Swift J0243.6+6124

KW - Stars: neutron

U2 - 10.1093/mnras/stx3082

DO - 10.1093/mnras/stx3082

M3 - Journal article

VL - 474

SP - 4432

EP - 4437

JO - Royal Astronomical Society. Monthly Notices

JF - Royal Astronomical Society. Monthly Notices

SN - 0035-8711

IS - 4

ER -