A Monte Carlo Study of the Spectra from Inhomogeneous Accretion Flow

Abstract

The model of inhomogeneous accretion flow, in which cold clumps are surrounded by hot gas or corona, has been proposed to explain the spectral features of black hole X-ray binaries (BHXBs). In this work, we try to find possible observational features in the continuum that can indicate the existence of clumps. The spectra of inhomogeneous accretion flow are calculated via the Monte Carlo method. Since the corresponding accretion flow is unsteady and complex, the accretion flow is described by a set of free parameters, the ranges of which can include the real cases. The influences of the parameters are investigated. It is found that the thermal component of the spectra deviates from the multi-color black body spectra in the middle power-law part. On the one hand, a warp appears due to the gap region between the clumps and the outer cold disk, and on the other hand, the slope of the line connecting the thermal peaks deviates from 4/3. The warp feature, as well as the correlation between the thermal peak at higher frequency and the spectral index, are possible to indicate the existence of clumps, and are worthy of further investigation with more self-consistent models.

11 pages, 3 figures, to appear in Research in Astronomy and Astrophysics (RAA)

References in corpus (10)

• Modelling the behaviour of accretion flows in X-ray binaries
• X-ray irradiation in XTE J1817-330 and the inner radius of the truncated disc in the hard state
• Correlation between the photon index and X-ray luminosity of black hole X-ray binaries and active galactic nuclei: observations and interpretation
• The Existence of Inner Cool Disks in the Low Hard State of Accreting Black Holes
• On the Magnetic Prandtl Number Behavior of Accretion Disks
• Re-condensation from an ADAF into an inner disk - the intermediate state of black hole accretion?
• The role of the disk magnetization on the hysteresis behavior of X-ray binaries
• On the X-ray spectra of luminous, inhomogeneous accretion flows
• Observational characteristics of accretion onto black holes
• Influences of magnetic coupling process on the spectrum of a disk covered by the corona

Cited by in corpus (1)

• The width-flux relation of the broad iron line during the state transition of the black hole X-ray binaries