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

@article{43585,
   author = {Abramowicz, Marek and Straub, Odele},
   article_location = {FR - Francouzská republika},
   article_number = {A83},
   doi = {http://dx.doi.org/10.1051/0004-6361/201219209},
   keywords = {Black hole physics; Accretion; Accretion disks; Galaxy: center},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy & Astrophysics},
   title = {Modelling the black hole silhouette in Sagittarius A* with ion tori},
   url = {https://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201219209&Itemid=129},
   volume = {543},
   year = {2012}
}

TY  - JOUR
ID  - 43585
AU  - Abramowicz, Marek - Straub, Odele
PY  - 2012
TI  - Modelling the black hole silhouette in Sagittarius A* with ion tori
JF  - Astronomy & Astrophysics
VL  - 543
IS  - A83
SN  - 00046361
KW  - Black hole physics
KW  - Accretion
KW  - Accretion disks
KW  - Galaxy: center
UR  - https://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201219209&Itemid=129
N2  - 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*.
ER  - 

ABRAMOWICZ, Marek a Odele STRAUB. Modelling the black hole silhouette in Sagittarius A* with ion tori. \textit{Astronomy \&{} Astrophysics}. FR - Francouzská republika, 2012, roč.~543, A83, 11 s. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201219209.