Modelling hard and soft state of Cygnus X-1 with propagating mass accretion rate fluctuations
arXiv:1708.04182 · doi:10.1093/mnras/stx2110
Abstract
We present a timing analysis of threeRossi X-ray Timing Explorer observations of the black hole binary Cygnus X-1 with the propagating mass accretion rate fluctuations model PROPFLUC. The model simultaneously predicts power spectra, time lags, and coherence of the variability as a function of energy. The observations cover the soft and the hard state of the source, and the transition between the two. We find good agreement between model pre-dictions and data in the hard and in the soft state. Our analysis suggests that in the soft state the fluctuations propagate in an optically thin hot flow extending up to large radii above and below a stable optically thick disc. In the hard state, our results are consistent with a truncated disc geometry, where the hot flow extends radially inside the inner radius of the disc. In the transition from soft to hard state, the characteristics of the rapid variability are too complex to be successfully described with PROPFLUC. The surface density profile of the hot flow predicted by our model and the lack of QPOs in the soft and hard state, suggest that the spin of the black hole is aligned with the inner accretion disc and therefore probably with the rotational axis of the binary system.
arXiv comment12 pages, 9 figures, 2 tables, accepted for publication in MNRAS
References in corpus (35)
- On the Absorption of X-rays in the Interstellar Medium
- X-ray Properties of Black-Hole Binaries
- Radiation mechanisms and geometry of Cygnus X-1 in the soft state
- Low frequency QPO spectra and Lense-Thirring precession
- Investigating a Fluctuating-accretion Model for the Spectral-timing Properties of Accreting Black Hole Systems
- On the X-ray time lags in the black hole candidates
- The ABC of low-frequency quasi-periodic oscillations in Black-Hole Candidates: analogies with Z-sources
- Global General Relativistic MHD Simulation of a Tilted Black-Hole Accretion Disk
- The flux-dependent amplitude of broadband noise variability in X-ray binaries and active galaxies
- Soft state of Cygnus X-1: stable disk and unstable corona
- X-Ray Variability Coherence: How to Compute it, What it Means, and How it Constrains Models of Cyg X-1 and GX 339-4
- Investigating stellar-mass black hole kicks
- Understanding the long-term spectral variability of Cygnus X-1 with BATSE and ASM observations
- Temporal Properties of Cygnus X-1 During the Spectral Transitions
- Formation of a Black Hole in the Dark
- The Reflection Component from Cygnus X-1 in the Soft State Measured by NuSTAR and Suzaku
- An exact analytic treatment of propagating mass accretion rate fluctuations in X-ray binaries
- The evolution of a warped disc around a Kerr black hole
- Long term variability of Cygnus X-1 V. State definitions with all sky monitors
- Wind Accretion and State Transitions in Cygnus X-1
- Bardeen-Petterson Effect and Quasi-Periodic Oscillations in X-Ray Binaries
- Epicyclic Motions and Standing Shocks in Numerically Simulated Tilted Black-Hole Accretion Disks
- Modelling the high mass accretion rate spectra of GX 339-4: Black hole spin from reflection?
- Evolution of the 0.01 - 25 Hz power spectral components in Cygnus X-1
- Spin-Induced Disk Precession in the Supermassive Black Hole at the Galactic Center
- RXTE Observation of Cygnus X-1: Spectral Analysis
- Alignment Timescale of the Microquasar GRO J1655-40
- Mapping the inner accretion disk of the galactic black hole J1550-564 through its rise to outburst
- Modelling the cross-spectral variability of the black hole binary MAXI J1659-152 with propagating accretion rate fluctuations
- The aperiodic variability of Cyg X-1 and GRS 1915 +105 at very low frequencies
- Fast variability as a probe of the smallest regions around accreting black holes
- Interference as an origin of the peaked noise in accreting X-ray binaries
- Evolution of the hot flow of MAXI J1543-564
- Black holes in stellar-mass binary systems: expiating original spin?
- The Physical Interpretation of X-ray Phase Lags and Coherence: RXTE Observations of Cygnus X--1 as a Case Study
Cited by in corpus (29)
- A review of quasi-periodic oscillations from black hole X-ray binaries: observation and theory
- A public relativistic transfer function model for X-ray reverberation mapping of accreting black holes
- Time lags of the type-B QPO in MAXI J1348-630
- Multi-timescale X-ray reverberation mapping of accreting black holes
- Propagating mass accretion rate fluctuations in X-ray binaries under the influence of viscous diffusion
- An X-ray reverberation mass measurement of Cygnus X-1
- A quantitative explanation of the type-B QPOs in GX 339-4
- Breaking the spectral degeneracies in black hole binaries with fast timing data
- A systematic study of the phase difference between QPO harmonics in black hole X-ray binaries
- Error formulae for the energy-dependent cross-spectrum
- A stochastic propagation model to the energy dependent rapid temporal behaviour of Cygnus X-1 as observed by AstroSat in the hard state
- Interplay of spectral components in timing properties of accreting compact objects
- Unveiling the temporal properties of MAXI J1820+070 through AstroSat observations
- Looking for the underlying cause of black hole X-ray variability in GRMHD simulations
- The accretion flow geometry of MAXI J1820+070 through broadband noise research with Insight-HXMT
- Long term variability of Cygnus X-1. VIII. A spectral-timing look at low energies with NICER
- Accretion geometry of the black hole binary MAXI J1820+070 probed by frequency-resolved spectroscopy
- Illumination of the accretion disk in black hole binaries: An extended jet as the primary source of hard X-rays
- Hilbert-Huang Transform analysis of quasi-periodic oscillations in MAXI J1820+070
- Continuum optical-UV and X-ray variability of AGN: current results and future challenges
- Evolution of the truncated disc and inner hot-flow of GX 339-4
- The long term X-ray time-lags of NGC 4051
- Evolution of Accretion Modes between Spectral States Inferred from Spectral and Timing Analysis of Cygnus X-1 with Insight-HXMT observations
- Detection of a low frequency quasi-periodic oscillation in the soft state of Cygnus X-1 with Insight-HXMT
- A Model for Spectral States and Their Transition in Cyg X-1
- The spectral-timing analysis of Cygnus X-1 with Insight-HXMT
- On measuring the Hubble constant with X-ray reverberation mapping of active galactic nuclei
- Probing black-hole accretion through time variability
- Black holes: accretion processes in X-ray binaries