Self-consistent spectra from radiative GRMHD simulations of accretion onto Sgr A*

Abstract

We present the first spectral energy distributions produced self-consistently by 2.5D general relativistic magneto-hydrodynamical (GRMHD) numerical simulations, where radiative cooling is included in the dynamical calculation. As a case study, we focus on the accretion flow around the supermassive black hole in the Galactic Centre, Sagittarius A* (Sgr A*), which has the best constrained physical parameters. We compare the simulated spectra to the observational data of Sgr A* and explore the parameter space of our model to determine the effect of changing the initial magnetic field configuration, ion to electron temperature ratio T_i/T_e and the target accretion rate. We find the best description of the data for a mass accretion rate of ~ 1e-9 Msun/yr, and rapid spin (0.7 < a_* < 0.9). The submillimeter peak flux seems largely independent of initial conditions, while the higher energies can be very sensitive to the initial magnetic field configuration. Finally, we also discuss flaring features observed in some simulations, that may be due to artifacts of the 2D configuration.

Submitted to MNRAS. 13 pages, 15 figures

References in corpus (12)

• Event-horizon-scale structure in the supermassive black hole candidate at the Galactic Centre
• An Unambiguous Detection of Faraday Rotation in Sagittarius A*
• The Submillimeter Bump in Sgr A* from Relativistic MHD Simulations
• X-ray hiccups from SgrA* observed by XMM-Newton. The second brightest flare and three moderate flares caught in half a day
• Simultaneous Chandra, CSO and VLA Observations of Sgr A*: The Nature of Flaring Activity
• Time Dependent Models of Flares from Sagittarius A*
• Evidence for Gamma-ray Jets in the Milky Way
• GRMHD simulations of accretion onto Sgr A*: How important are radiative losses?
• Numerical Simulations of Optically Thick Accretion onto a Black Hole - I. Spherical Case
• Simultaneous NIR/sub-mm observation of flare emission from SgrA*
• A Three Parsec-Scale Jet-Driven Outflow from Sgr A*
• Flares and variability from Sagittarius A*: five nights of simultaneous multi-wavelength observations

Cited by in corpus (30)

• Dissecting X-ray-emitting Gas around the Center of our Galaxy
• A Chandra/HETGS Census of X-ray Variability From Sgr A* During 2012
• Towards the event horizon -- the supermassive black hole in the Galactic Center
• Magnetorotational Turbulence and Dynamo in a Collisionless Plasma
• H-AMR: A New GPU-accelerated GRMHD Code for Exascale Computing With 3D Adaptive Mesh Refinement and Local Adaptive Time-stepping
• Particle Acceleration and the Origin of X-ray Flares in GRMHD simulations of Sgr A*
• Observational signatures of disk and jet misalignment in images of accreting black holes
• Two-Temperature GRRMHD Simulations of M87
• Evidence for quiescent synchrotron emission in the black hole X-ray transient Swift J1357.2-0933
• Numerical Simulations of Optically Thick Accretion onto a Black Hole - II. Rotating Flow
• A parameter survey of Sgr A* radiative models from GRMHD simulations with self-consistent electron heating
• General relativistic MHD simulations of non-thermal flaring in Sagittarius A*
• The Properties of Reconnection Current Sheets in GRMHD Simulations of Radiatively Inefficient Accretion Flows
• Imaging an Event Horizon: Mitigation of Source Variability of Sagittarius A*
• ALMA Observations of the Terahertz Spectrum of Sagittarius A*
• Spectral and Imaging properties of Sgr A* from High-Resolution 3D GRMHD Simulations with Radiative Cooling
• Exploring plasma evolution during Sagittarius A* flares
• Temperature properties in magnetised and radiatively cooled two-temperature accretion flows onto a black hole
• Quantifying Intrinsic Variability of Sagittarius A* using Closure Phase Measurements of the Event Horizon Telescope
• Testing the nature of the supermassive black hole candidate in SgrA* with light curves and images of hot spots
• Black hole spin: theory and observation
• Radiatively Inefficient Accretion Flow Simulations with Cooling: Implications for Black Hole Transients
• Using infrared/X-ray flare statistics to probe the emission regions near the event horizon of Sgr A*
• Submillimeter Quasi-Periodic Oscillations in Magnetically Choked Accretion Flows Models of Sgr A*
• Radiation GRMHD simulations of M87: funnel properties and prospects for gap acceleration
• Modeling Hot Gas Flow in the Low-Luminosity Active Galactic Nucleus of NGC3115
• Images and Spectra of Time Dependent Two Component Advective Flow in Presence of Outflows
• Constraining cosmic-ray acceleration in the magnetospheric gaps of Sgr A*
• Radiative Cooling Effects on Plasmoid Formation in Black Hole Accretion Flows with Multiple Magnetic Loops
• Current Status of Simulations