Title:	Broad-band mHz QPOs and spectral study of LMC X-4 with AstroSat
Authors:	Sharma, Rahul Jain, Chetana Rikame, Ketan Paul, Biswajit
Keywords:	accretion accretion discs stars neutron pulsars X-rays binaries LMC X-4
Issue Date:	2-Feb-2023
Publisher:	Oxford University Press on behalf of Royal Astronomical Society
Citation:	Monthly Notices of the Royal Astronomical Society, 2023, Vol. 519, p1764
Abstract:	We report the results of broad-band timing and spectral analysis of data from an AstroSat observation of the high-mass X-ray binary LMC X-4. The Large Area X-ray Proportional Counter (LAXPC) and Soft X-ray Telescope (SXT) instruments onboard the AstroSatobserved the source in 2016 August. A complete X-ray eclipse was detected with the LAXPC. The 3–40 keV power density spectrum showed the presence of coherent pulsations along with a ∼26 mHz quasi-periodic oscillation feature. The spectral properties of LMC X-4 were derived from a joint analysis of the SXT and LAXPC spectral data. The 0.5–25 keV persistent spectrum comprised of an absorbed high-energy cut-off power law with photon index of Γ ∼ 0.8 and cut-off at ∼16 keV, a soft thermal component with kTBB ∼ 0.14 keV, and Gaussian components corresponding to Fe Kα, Ne ix, and Ne x emission lines. Assuming a source distance of 50 kpc, we determined 0.5–25 keV luminosity to be ∼2 × 1038 erg s−1
Description:	Open Access
URI:	http://hdl.handle.net/2289/8021
ISSN:	0035-8711 1365-2966 (Online)
Alternative Location:	https://ui.adsabs.harvard.edu/abs/2023MNRAS.519.1764S/abstract https://arxiv.org/abs/2212.01003 https://doi.org/10.1093/mnras/stac3572
Copyright:	2023 The Author(s)
Appears in Collections:	Research Papers (A&A)

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