Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4809l&link_type=abstract
American Astronomical Society, AAS Meeting #211, #48.09; Bulletin of the American Astronomical Society, Vol. 39, p.810
Astronomy and Astrophysics
Astronomy
Scientific paper
In recent work (Fragile et al., 2007, ApJ, 668, 417) we presented the first results of global general relativistic MHD simulations of tilted (or misaligned) accretion disks. The simulated tilted disks showed dramatic differences from comparable untilted disks, such as asymmetrical accretion onto the hole through opposing "plunging streams" and global precession of the disk powered by a torque provided by the black hole. However, those simulations used a grid that was purposefully underresolved along the pole, which prevented us from assessing the behavior of any jets that may have been associated with the tilted disks. Here we present new results using a "cubed-sphere" grid, which allows us to simultaneously resolve the disk and polar regions. These new simulations allow us to answer the following critical questions: 1) Does a jet form in the tilted simulations as it does in the untilted? and 2) If a jet does form, what determines its orientation? The two most obvious candidates are either the angular momentum of the black hole or that of the disk. Since we hold the black-hole spin axis fixed and allow the disk to precess, a fixed jet indicates that its orientation is set by the black hole whereas a precessing jet must have its orientation set by the disk. We also explore differences between matter and Poynting-flux-dominated jets.
Fragile Chris P.
Lindner Christopher C.
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