Please use this identifier to cite or link to this item: http://hdl.handle.net/2248/7882
Title: NuSTAR and Swift observations of the extragalactic black hole X-ray binaries
Authors: Jana, Arghajit
Naik, Sachindra
Chatterjee, Debjit
Jaisawal, Gaurava K.
Keywords: accretion
accretion discs – stars
individual
(LMC X–1, LMC X–3) – X-rays
binaries
Issue Date: Nov-2021
Publisher: Oxford University Press on behalf of Royal Astronomical Society
Citation: Monthly notices of the Royal Astronomical Society, Vol. 507, No. 4, pp. 4779–4787
Abstract: We present the results obtained from detailed spectral and timing studies of extragalactic black hole X-ray binaries LMC X–1 and LMC X–3, using simultaneous observations with Nuclear Spectroscopic Telescope Array (NuSTAR) and Neil Gehrels Swift observatories. The combined spectra in the 0.5–30 keV energy range, obtained between 2014 and 2019, are investigated for both sources. We do not find any noticeable variability in 0.5–30 keV light curves, with 0.1–10 Hz fractional rms estimated to be <2 per cent. No evidence of quasi-periodic oscillations is found in the power density spectra. The sources are found to be in the high soft state during the observations with disc temperature Tin ∼ 1 keV, photon index, > 2.5 and thermal emission fraction, fdisc > 80 per cent. An Fe Kα emission line is detected in the spectra of LMC X–1, though no such feature is observed in the spectra of LMC X–3. From the spectral modelling, the spins of the black holes in LMC X–1 and LMC X–3 are estimated to be in the range of 0.92–0.95 and 0.19−0.29, respectively. The accretion efficiency is found to be, η ∼ 0.13 and η ∼ 0.04 for LMC X–1 and LMC X–3, respectively.
Description: Restricted Access
URI: http://hdl.handle.net/2248/7882
ISSN: 1365-2966
Appears in Collections:IIAP Publications

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