159 articles – 2004 Notices  [english version]
HAL : in2p3-00290125, version 1

Fiche détaillée  Récupérer au format
Astrophysical Journal Letters 679 (2008) L93-L96
Modulated X-ray Emissivity near the Stress Edge in Sgr A*
M. Falanga1, 2, F. Melia2, 3, M. Prescher, G. Belanger, A. Goldwurm1, 4

Sgr A* is thought to be the radiative manifestation of a ~3.6E6 Msun supermassive black hole at the Galactic center. Its mm/sub-mm spectrum and its flare emission at IR and X-ray wavelengths may be produced within the inner ten Schwarzschild radii of a hot, magnetized Keplerian flow. The lightcurve produced in this region may exhibit quasi-periodic variability. We present ray-tracing simulations to determine the general-relativistically modulated X-ray luminosity expected from plasma coupled magnetically to the rest of the disk as it spirals inwards below the innermost stable circular orbit towards the "stress edge" in the case of a Schwarzschild metric. The resulting lightcurve exhibits a modulation similar to that observed during a recent X-ray flare from Sgr A*.
1 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 :  AIM - UMR 7158 - Astrophysique Interactions Multi-échelles
3 :  University of Arizona
4 :  APC - UMR 7164 - AstroParticule et Cosmologie
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique
Accretion – Accretion Disks – Black Hole Physics – Galaxy: Center – Instabilities – Magnetohydrodynamics: MHD – Plasmas
Lien vers le texte intégral :