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- W4223900248 abstract "We report on timing and spectral analysis of transient Be X-ray pulsar GRO J1750-27 by using the Nuclear Spectroscopic Telescope Array (NuSTAR) observation from September 2021. This is the fourth outburst of the system since 1995. The NuSTAR observation was performed during the rising phase of the outburst. Pulsations at a period of 4.450710(1) s were observed in the 3-60 keV energy range. The average pulse profile comprised of a broad peak with a weak secondary peak which evolved with energy. We did not find any appreciable variation in the X-ray emission during this observation. The broad-band phase-averaged spectrum is described by a blackbody, a powerlaw or Comptonization component. We report discovery of Fe K$_{alpha}$ line at 6.4 keV along with presence of two cyclotron resonant scattering features around 36 and 42 keV. These lines indicate a magnetic field strength of $3.7_{-0.3}^{+0.1} times 10^{12}$ and $4.4 pm 0.1 times 10^{12}$ G for the neutron star. We have estimated a source distance of $sim$ 13.6-16.4 kpc based on the accretion-disc torque models." @default.
- W4223900248 created "2022-04-19" @default.
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- W4223900248 date "2022-04-15" @default.
- W4223900248 modified "2023-10-18" @default.
- W4223900248 title "Discovery of cyclotron and narrow Fe Kα lines in HMXB GRO J1750–27" @default.
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- W4223900248 doi "https://doi.org/10.1093/mnrasl/slac041" @default.
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