Accretion models of Sgr A*

Abstract

The supermassive black hole in the center of our Galaxy, Sgr A*, is unique because the angular size of the black hole is the largest in the sky thus providing detailed boundary conditions on, and much less freedom for, accretion flow models. In this paper I review advection-dominated accretion flow (ADAF; another name is radiatively inefficient accretion flow) models for Sgr A*. This includes the developments and dynamics of ADAFs, and how to explain observational results including the multi-waveband spectrum, radio polarization, IR and X-ray flares, and the size measurements at radio wavebands.

9 pages, 6 figures; invited talk presented at the "Galactic Center Workshop 2006: From the Center of the Milky Way to Nearby Low-Luminosity Galactic Nuclei", April 18-22, 2006; Bad Honnef, Germany

References in corpus (42)

• Advection-Dominated Accretion: A Self-Similar Solution
• 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
• Advection-Dominated Accretion: Self-Similarity and Bipolar Outflows
• Chandra X-ray Spectroscopic Imaging of Sgr A* and the Central Parsec of the Galaxy
• The First Measurement of Spectral Lines in a Short-Period Star Bound to the Galaxy's Central Black Hole: A Paradox of Youth
• 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
• The Supermassive Black Hole at the Galactic Center
• 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
• A size of ~1 AU for the radio source Sgr A* at the centre of the Milky Way
• Spectral Models of Advection-Dominated Accretion Flows with Winds
• Spectrum of Optically Thin Advection Dominated Accretion Flow around a Black Hole: Application to Sgr A*
• The Nature of the 10 Kilosecond X-ray Flare in Sgr A*
• Turbulence and Particle Heating in Advection-Dominated Accretion Flows
• XMM-Newton observation of the brightest X-ray flare detected so far from SgrA*
• Interferometric Measurements of Variable 340 GHz Linear Polarization in Sagittarius A*
• Detection of the Intrinsic Size of Sagittarius A* through Closure Amplitude Imaging (includes Online Supporting Material)
• Constraining the Accretion Rate Onto Sagittarius A* Using Linear Polarization
• The simultaneous spectrum of Sgr A* from 20cm to 1mm and the nature of the mm-excess
• On The Nature of the Variable Infrared Emission from Sgr A*
• First Simultaneous NIR/X-ray Detection of a Flare from SgrA*
• Galactic Centre stellar winds and Sgr A* accretion
• A Multi-Wavelength Study of Sgr A*: The Role of Near-IR Flares in Production of X-ray, Soft $\gamma$-ray and Sub-millimeter Emission
• Global Three-Dimensional Simulations of Black Hole Accretion Disks: X-ray Flares in the Plunging Region
• Luminous hot accretion disks
• Variability of Sagittarius A* - Flares at 1 Millimeter
• A New X-Ray Flare from the Galactic Nucleus Detected with the XMM-Newton Photon Imaging Cameras
• Variations in the spectral slope of Sgr A* during a NIR flare
• The Rotation Measure and 3.5mm Polarization of Sgr A*
• The Variability of Sagittarius A* at Centimeter Wavelengths
• Luminous hot accretion flows: thermal equilibrium curve and thermal stability
• Intra-Day Variation of Sagittarius A* at Short Millimeter Wavelengths
• A Magnetic Dynamo Origin For The Sub-mm Excess In Sgr A*
• A Radio Outburst Nearly Coincident with the Large X-ray Flare from Sgr A* on 2002-10-03
• Testing RIAF model for Sgr A* using the size measurements

Cited by in corpus (8)

• Tidal effects on small bodies by massive black holes
• First proper motions of thin dust filaments at the Galactic Center
• Interstellar gas within $\sim 10$ pc of Sgr A${}^{\ast }$
• On the Origin of Ultraviolet Emission and the Accretion Model of Low-luminosity AGNs
• Properties of the Radio-Emitting Gas Around SgrA*
• Coordinated multi-wavelength observations of Sgr A*
• Constraints on jet-driven disk accretion in Sagittarius A*
• Self-Similar Solutions for Viscous and Resistive ADAF