2021MNRAS.500.3454T -
Mon. Not. R. Astron. Soc., 500, 3454-3461 (2021/January-3)
New measurements of the cyclotron line energy in Cen X-3.
TOMAR G., PRADHAN P. and PAUL B.
Abstract (from CDS):
We report results from the analysis of data from two observations of the accreting binary X-ray pulsar Cen X-3 carried out with the broad-band X-ray observatories Suzaku and NuSTAR. The pulse profile is dominated by a broad single peak and show some energy dependence with two additional weak pulse peaks at energies below 15 and 25 keV, respectively. The broad-band X-ray spectrum for 0.8-60.0 keV for Suzaku and 3.0-60.0 keV for NuSTAR is fitted well with high-energy cut-off power-law model along with soft-excess, multiple iron emission lines and a cyclotron absorption. The cyclotron line energy is found to be 30.29+0.68–0.61 and 29.22+0.28–0.27 keV, respectively, in the Suzaku and NuSTAR spectra. We make a comparison of these two measurements with four previous measurements of Cyclotron Resonant Scattering Feature (CRSF) in Cen X-3 obtained with Ginga, BeppoSAX, and RXTE. We find no evidence for a dependence of the CRSF on luminosity. Except for one CRSF measurement with BeppoSAX , the remaining measurements are consistent with a CRSF energy in the range of 29.5-30.0 keV over a luminosity range of 1.1-5.4 x 1037 erg s–1 different from several other sources that show considerable CRSF variation in the same luminosity range.
Abstract Copyright:
© 2020 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society
Journal keyword(s):
stars: neutron - pulsars: general - X-rays: binaries - X-rays: individual: Cen X-3
Simbad objects:
10
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