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Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/6829
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dc.contributor.authorPahari, Mayukh-
dc.contributor.authorAnita, H.M.-
dc.contributor.authorYadav, J.S.-
dc.contributor.authorPaul, Biswajit-
dc.contributor.author+9 Co-authors-
dc.date.accessioned2018-01-29T11:55:25Z-
dc.date.available2018-01-29T11:55:25Z-
dc.date.issued2017-11-
dc.identifier.citationAstrophysical Journal, 2017, Vol.849, p16en_US
dc.identifier.issn0004-637X-
dc.identifier.issn1538-4357-(Online)-
dc.identifier.urihttp://hdl.handle.net/2289/6829-
dc.descriptionOpen Accessen_US
dc.description.abstractWe present here results from the X-ray timing and spectral analysis of the X-ray binary Cyg X-3 using observations from the Large Area X-ray proportional Counter on board AstroSat. Consecutive light curves observed over a period of one year show the binary orbital period of 17253.56 ± 0.19 s. Another low-amplitude, slow periodicity of the order of 35.8 ± 1.4 days is observed, which may be due to the orbital precession as suggested earlier by Molteni et al. During the rising binary phase, power density spectra from different observations during the flaring hard X-ray state show quasi-periodic oscillations (QPOs) at ~5–8 mHz, ~12–14 mHz, and ~18–24 mHz frequencies at the minimum confidence of 99%. However, during the consecutive binary decay phase, no QPO is detected up to 2σ significance. Energy-dependent time-lag spectra show soft lag (soft photons lag hard photons) at the mHz QPO frequency and the fractional rms of the QPO increases with the photon energy. During the binary motion, the observation of mHz QPOs during the rising phase of the flaring hard state may be linked to the increase in the supply of the accreting material in the disk and corona via stellar wind from the companion star. During the decay phase, the compact source moves in the outer wind region causing the decrease in supply of material for accretion. This may cause weakening of the mHz QPOs below the detection limit. This is also consistent with the preliminary analysis of the orbital phase-resolved energy spectra presented in this paper.en_US
dc.language.isoenen_US
dc.publisherIOP Sciences for The American Astronomical Societyen_US
dc.relation.urihttp://adsabs.harvard.edu/abs/2017ApJ...849...16Pen_US
dc.relation.urihttp://arxiv.org/abs/1709.06353en_US
dc.relation.urihttp://dx.doi.org/10.3847/1538-4357/aa8d6cen_US
dc.rights2017 American Astronomical Societyen_US
dc.subjectaccretion disksen_US
dc.subjectblack hole physicsen_US
dc.titleX-Ray timing analysis of Cyg X-3 using AstroSat/LAXPC: detection of milli-hertz quasi-periodic oscillations during the flaring hard x-ray stateen_US
dc.typeArticleen_US
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