Accretion of Low Angular Momentum Material onto Black Holes: Radiation Properties of Axisymmetric MHD Flows
arXiv:0707.1403 · doi:10.1051/0004-6361:20077703
Abstract
Numerical simulations of MHD accretion flows in the vicinity of a supermasssive black hole provide important insights to the problem of why and how systems -- such as the Galactic Center -- are underluminous and variable. To access applicability of such flows to real objects, we examine the dynamical MHD studies with computations of the time dependent radiation spectra predicted by the simulations. We apply Monte Carlo methods to calculate spectra predicted by the time-dependent model of an axisymmetic MHD flow accreting onto a black hole presented by Proga and Begelman. Our calculations show that variability in an accretion flow is not always reflected in the corresponding spectra, at least not in all wavelengths. We find no one-to-one correspondence between the accretion state and the predicted spectrum
arXiv comment18 pages,8 figures,accepted to A&A
References in corpus (45)
- On the Fate of Gas Accreting at a Low Rate onto a Black Hole
- Closest Star Seen Orbiting the Supermassive Black Hole at the Centre of the Milky Way
- Chandra X-ray Spectroscopic Imaging of Sgr A* and the Central Parsec of the Galaxy
- Nonthermal Electrons in Radiatively Inefficient Accretion Flow Models of Sagittarius A*
- Near-infrared flares from accreting gas around the supermassive black hole at the Galactic Centre
- Rapid X-ray flaring from the direction of the supermassive black hole at the Galactic Centre
- Advection-Dominated Accretion Model of Sagittarius A*: Evidence for a Black Hole at the Galactic Center
- Hydrodynamical Non-radiative Accretion Flows in Two-Dimensions
- The Dynamical Structure of Nonradiative Black Hole Accretion Flows
- Variable Infrared Emission from the Supermassive Black Hole at the Center of the Milky Way
- A Jet-ADAF model for Sgr A*
- Interferometric Detection of Linear Polarization from Sagittarius A* at 230 GHz
- Spectral Models of Advection-Dominated Accretion Flows with Winds
- Magnetohydrodynamical Non-radiative Accretion Flows in Two-Dimensions
- Turbulence and Particle Heating in Advection-Dominated Accretion Flows
- The Nature of the 10 Kilosecond X-ray Flare in Sgr A*
- XMM-Newton observation of the brightest X-ray flare detected so far from SgrA*
- Polarimetry of near-infrared flares from Sagittarius A*
- Constraining the Accretion Rate Onto Sagittarius A* Using Linear Polarization
- First Simultaneous NIR/X-ray Detection of a Flare from SgrA*
- Accretion of low angular momentum material onto black holes: 2D magnetohydrodynamical case
- Galactic Centre stellar winds and Sgr A* accretion
- Magnetohydrodynamical Accretion Flows: Formation of Magnetic Tower Jet and Subsequent Quasi-Steady State
- Black hole growth and activity in a LambdaCDM Universe
- A Dynamical Model for Hot Gas in the Galactic Center
- Where is the Inner Edge of an Accretion Disk Around a Black Hole?
- Harmony in Electrons: Cyclotron and Synchrotron Emission by Thermal Electrons in a Magnetic Field
- Are Particles in Advection-Dominated Accretion Flows Thermal?
- Three-Dimensional Magnetohydrodynamic Simulations of Spherical Accretion
- Variable Linear Polarization from Sagittarius A*: Evidence for a Hot Turbulent Accretion Flow
- Hot One-Temperature Accretion Flows Around Black Holes
- The Rotation Measure and 3.5mm Polarization of Sgr A*
- A Thermal Bremsstrahlung Model For the Quiescent X-ray Emission from Sagittarius A*
- Diffuse X-Rays from the Inner 3 Parsecs of the Galaxy
- Repeated X-ray Flaring Activity in Sagittarius A*
- Synchrotron Radiation From Radiatively Inefficient Accretion Flow Simulations: Applications to Sgr A*
- Full Three Dimensional Orbits For Multiple Stars on Close Approaches to the Central Supermassive Black Hole
- Thermalization by synchrotron absorption in compact sources: electron and photon distributions
- The X-ray-faint Emission of the Supermassive Nuclear Black Hole of IC1459
- Direct Feeding of the Black Hole at the Galactic Center with Radial Gas Streams from Close-In Stellar Winds
- The pattern of accretion flow onto Sgr A*
- Properties of the Radio-Emitting Gas Around SgrA*
- Spectral properties of Three-dimensional Magneto-hydrodynamical Accretion Flows
- Spherical Accretion in Nearby Weakly Active Galaxies
- Time Variability of Low Angular Momentum Flows Accreting onto Black Holes: A Natural Mechanism For Radiation Flaring
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- Radiative Models of Sgr A* from GRMHD Simulations
- Ionized outflows from active galactic nuclei as the essential elements of feedback
- A Stochastic Model for the Luminosity Fluctuations of Accreting Black Holes
- Variable accretion and emission from the stellar winds in the Galactic centre
- The outflows accelerated by the magnetic fields and radiation force of accretion disks
- Spectral and Imaging properties of Sgr A* from High-Resolution 3D GRMHD Simulations with Radiative Cooling
- X-ray Emissions from Three-dimensional Magnetohydrodynamic Coronal Accretion Flows
- A Mechanism for Triple-Ridge Emission Structure of AGN Jets
- The launching condition of a jet driven by the magnetic field and radiation pressure of an accretion disc
- Magnetized Accretion Flows: Effects of Gas Pressure
- Magnetically arrested disk flux eruption events to describe SgrA* flares
- Three-dimensional Radiative Properties of Hot Accretion Flows onto the Galactic Centre Black Hole
- Hydromagnetics of advective accretion flows around black holes: Removal of angular momentum by large scale magnetic stresses
- Low angular momentum flow model of Sgr A* activity
- An Analytical Fourier-Transformation Model for the Production of Hard and Soft X-Ray Time Lags in AGNs: Application to 1H 0707-495