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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19240%2F12%3A%230004529" target="_blank" >RIV/47813059:19240/12:#0004529 - isvavai.cz</a>

Result on the web

<a href="http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201219209&Itemid=129" target="_blank" >http://www.aanda.org/index.php?option=com_article&access=doi&doi=10.1051/0004-6361/201219209&Itemid=129</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/201219209" target="_blank" >10.1051/0004-6361/201219209</a>

Result language

angličtina

Original language name

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

Original language description

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*.

Czech name

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Czech description

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Type

J_x - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)

CEP classification

BN - Astronomy and celestial mechanics, astrophysics

OECD FORD branch

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Project

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Continuities

O - Projekt operacniho programu

Publication year

2012

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

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Volume of the periodical

543

Issue of the periodical within the volume

JUL 2012

Country of publishing house

FR - FRANCE

Number of pages

11

Pages from-to

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UT code for WoS article

000306597200083

EID of the result in the Scopus database

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