Query : 2012A&A...543A..83S

2012A&A...543A..83S - Astronomy and Astrophysics, volume 543A, 83-83 (2012/7-1)

Modelling the black hole silhouette in Sagittarius A* with ion tori.


Abstract (from CDS):

We calculate the ``observed at infinity'' image and spectrum of the accretion structure in Sgr A*, by modelling it as an optically thin, constant angular momentum ion torus in hydrodynamic equilibrium. The physics we consider includes a two-temperature plasma, a toroidal magnetic field, as well as radiative cooling by bremsstrahlung, synchrotron, and inverse Compton processes. Our relativistic model has the virtue of being fully analytic and very simple, depending only on eight tunable parameters: the black hole spin and the inclination of the spin axis to our line of sight, the torus angular momentum, the polytropic index, the magnetic to total pressure ratio, the central values of density and electron temperature, and the ratio of electron to ion temperatures. The observed image and spectrum are calculated numerically using the ray-tracing code GYOTO. Our results demonstrate that the ion torus model is able to account for the main features of the accretion structure surrounding Sgr A*.

Abstract Copyright:

Journal keyword(s): black hole physics - accretion, accretion disks - Galaxy: center

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 13084 0
2 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3929 3
3 [EG97] S2 * 17 45 40.0442 -29 00 27.975           B0/2V 331 1
4 HD 226868 HXB 19 58 21.6757355952 +35 12 05.784512688 9.38 9.72 8.91 8.42   O9.7Iabpvar 4122 0

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