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

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*. RAMOWICZ M, 1978, ASTRONOMY AND ASTROPHYSICS, V63, P221 RAMOWICZ MA, 1995, ASTROPHYSICAL JOURNAL, V438, PL37 RAMOWICZ MA, 1983, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, V203, P323

NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
black hole physics
accretion
accretion disks
Galaxy: center
advection-dominated accretion
near-infrared flares
galactic-center
x-ray
synchrotron-radiation
angular-momentum
magnetic-field
central
parsec
disks
simulations
neration instrumentation
p313
rmer cd
1991
astrophysical journal
v369
p410

Vincent, F. H. (author)
Abramowicz, Marek A,1945Gothenburg University,Göteborgs universitet,Institutionen för fysik (GU),Department of Physics (GU)(Swepub:gu)xabrma (author)
Gourgoulhon, E. (author)
Paumard, T. (author)
Göteborgs universitetInstitutionen för fysik (GU) (creator_code:org_t)

By the author/editor: Straub, O.; Vincent, F. H.; Abramowicz, Mare ...; Gourgoulhon, E.; Paumard, T.

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Physical Science ...; and Astronomy Astrop ...

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