HAL : in2p3-00290125, version 1

arXiv : 0804.2855

Code Bibliographique ADS : 2008ApJ...679L..93F

DOI : 10.1086/589438

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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

(2008)

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 - Astrophysique Interactions Multi-échelles
3 :	University of Arizona
4 :	APC - AstroParticule et Cosmologie

équipe(s) de recherche : APC - AHE

Thème(s)

:

Physique/Astrophysique/Cosmologie et astrophysique extra-galactique Planète et Univers/Astrophysique/Cosmologie et astrophysique extra-galactique

Mot(s)-clé(s) : Accretion – Accretion Disks – Black Hole Physics – Galaxy: Center – Instabilities – Magnetohydrodynamics: MHD – Plasmas

in2p3-00290125, version 1

http://hal.in2p3.fr/in2p3-00290125

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Contributeur : Simone Lantz <>

Soumis le : Mardi 24 Juin 2008, 16:51:43

Dernière modification le : Vendredi 22 Juin 2012, 21:43:50