Spectro-timing analysis of MAXI J1535-571 using AstroSat

Abstract

We report the results of the analysis of an AstroSat observation of the Black Hole candidate MAXI J1535-571 during its Hard Intermediate state. We studied the evolution of the spectral and timing parameters of the source during the observation. The observation covered a period of $\sim$5 days and consisted of 66 continuous segments, corresponding to individual spacecraft orbits. Each segment was analysed independently. The source count rate increased roughly linearly by $\sim$30 %. We modelled the spectra as a combination of radiation from a thermal disk component and a power-law. The timing analysis revealed the presence of strong Quasi Periodic Oscillations with centroid frequency ${\nu }_{\mathrm{QPO}}$ fluctuating in the range 1.7-3.0 Hz. We found a tight correlation between the QPO centroid frequency ${\nu }_{\mathrm{QPO}}$ and the power-law spectral index $\Gamma$, while ${\nu }_{\mathrm{QPO}}$ appeared not to be correlated with the linearly-increasing flux itself. We discuss the implications of these results on physical models of accretion.

arXiv comment8 pages, 8 figures; Accepted in MNRAS

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• Rapid compact jet quenching in the Galactic black hole candidate X-ray binary MAXI J1535-571
• The comptonizing medium of the black-hole X-ray binary MAXI~J1535$-$571 through type-C quasi-periodic oscillations
• Identification of QPO frequency of GRS 1915+105 as the relativistic dynamic frequency of a truncated accretion disk
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• Identifying the radiative components responsible for Quasi-Periodic Oscillations of black hole systems
• Wavelet analysis of the transient QPOs in MAXI J1535$-$571 with Insight-HXMT
• Accreting on the edge: a luminosity-dependent cyclotron line in the Be/X-ray Binary 2S 1553-542 accompanied by accretion regimes transition
• Testing the dynamic origin of Quasi-periodic Oscillations in MAXI J1535-571 and H 1743-322
• AstroSat view of the neutron star low-mass X-ray binary GX 340+0
• Spectral and Temporal Studies of Swift\,J1658.2--4242 using {\it AstroSat} Observations with {\tt JeTCAF} Model
• Science with the $AstroSat$ Soft X-ray Telescope: an overview
• AstroSat Observation of Non-Resonant Type-C QPOs in MAXI J1535-571
• Probing spectral and temporal evolution of the neutron star low-mass X-ray binary 4U 1724-30 with AstroSat
• LAXPC instrument onboard AstroSat: Five exciting years of new scientific results specially on X-ray Binaries
• MAXI J1535-571 2017 outburst Seen by INTEGRAL/SPI and Investigating the Origin of Its Hard Tail
• QPOML: A Machine Learning Approach to Detect and Characterize Quasi-Periodic Oscillations in X-ray Binaries
• The NICER view of Scorpius X-1