On the energy dependence of the QPO phenomenon in the black hole system MAXI J1535-571

Abstract

Previous analysis of AstroSat observations of the black hole system MAXI J1535-571, have revealed the presence of a strong Quasi-Periodic Oscillation (QPO) whose frequency is correlated with the high energy spectral index. Here, we fit the spectra as emitted from a truncated disc with an inner hot corona, study the QPO frequency dependence on other spectral parameters and model the energy dependent r.m.s and time-lag of the QPO to identify the physical spectral parameters whose variation are responsible for the QPO. The QPO frequency is found to also correlate with the scattering fraction (i.e. the fraction of the soft photons Comptonized) and its dependence on the accretion rate and inner disc radii is consistent with it being the dynamical frequency. The time-lag between the hard and soft photons is negative for QPO frequency > 2.2 Hz and is positive for lesser values, making this the second black hole system to show this behaviour after GRS 1915+105. Modelling the energy dependent time-lag and r.m.s requires correlated variation of the accretion rate, inner disc radii and the coronal heating rate, with the latter having a time-lag compared to the other two for QPO frequencies less than < 2.2 Hz and which changes sign (i.e. the coronal heating variation precedes the accretion rate one) for higher values. The implications of the results are discussed.

9 pages, 10 figures, Accepted for publication in MNRAS

References in corpus (17)

• A review of quasi-periodic oscillations from black hole X-ray binaries: observation and theory
• Spectral and temporal properties of Compton scattering by mildly relativistic thermal electrons
• Large Area X-ray Proportional Counter (LAXPC) Instrument on AstroSat and Some Preliminary Results from its performance in the orbit
• AstroSat view of MAXI J1535-571: broadband spectro-temporal features
• A Systematic Analysis of the Phase Lags Associated with the Type-C Quasi-periodic Oscillation in GRS 1915+105
• A variable corona for GRS 1915+105
• On the different flavours of Lense-Thirring precession around accreting stellar mass black holes
• Spectro-timing analysis of MAXI J1535-571 using AstroSat
• Broadband reflection spectroscopy of MAXI J1535-571 using AstroSat: Estimation of black hole mass and spin
• Identification of QPO frequency of GRS 1915+105 as the relativistic dynamic frequency of a truncated accretion disk
• A stochastic propagation model to the energy dependent rapid temporal behaviour of Cygnus X-1 as observed by AstroSat in the hard state
• Testing evolution of LFQPOs with mass accretion rate in GRS 1915+105 with Insight-HXMT
• Spectral and Timing Properties of the Galactic X-ray transient Swift~J1658.2--4242 using Astrosat Observations
• Unveiling the temporal properties of MAXI J1820+070 through AstroSat observations
• Identifying the radiative components responsible for Quasi-Periodic Oscillations of black hole systems
• A geometric origin for quasi-periodic oscillations in black hole X-ray binaries
• Time-resolved spectroscopy on the heartbeat state of GRS 1915+105 using AstroSat

Cited by in corpus (9)

• The comptonizing medium of the black-hole X-ray binary MAXI~J1535$-$571 through type-C quasi-periodic oscillations
• A detailed view of low-frequency quasi-periodic oscillation in the broadband 0.2-200 keV with Insight-HXMT and NICER
• Testing the dynamic origin of Quasi-periodic Oscillations in MAXI J1535-571 and H 1743-322
• Exploring the broadband spectral and timing characteristics of GRS 1915+105 with AstroSat and NICER observations
• Evolution of the Comptonizing medium of the black-hole candidate Swift J1727.8$-$1613 along the hard to hard-intermediate state transition using NICER
• Spectral and Timing evolution of GX 340+0 along its Z-track
• Evolution of QPOs in GX 339-4 and EXO 1846-031 with Insight-HXMT and NICER
• Probing the soft state evolution of 4U 1543-47 during its 2021 outburst using AstroSat
• QPOML: A Machine Learning Approach to Detect and Characterize Quasi-Periodic Oscillations in X-ray Binaries