Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004phdt.........3m&link_type=abstract
PhD Thesis, Combined Faculties for the Natural Sciences and for Mathematics of the University of Heidelberg, Germany. VI + 129 +
Astronomy and Astrophysics
Astrophysics
10
Astrophysics, Black Holes, General Relativity, Magnetohydrodynamics
Scientific paper
This work is dedicated to the astrophysics of rotating black holes. The main topic concerns accretion physics in the regime of General Relativistic Magnetohydrodynamics (GRMHD). The behavior of non-radiative accretion flows and outflows on the Kerr space-time is analyzed. Basic equations of conservative GRMHD and aspects of numerical schemes are presented. Relativistic codes and astrophysical simulations validate numerical schemes. A synopsis gives requirements for a robuste GRMHD code. Further developments in GRMHD research are investigated. Another part deals with radiation from accretion disks. Relativistically broadened emission lines from active galactic nuclei and X-ray binaries are calculated by relativistic ray tracing. A new model - based on truncated standard disks - is presented that considers radial drift in accretion flows. Emission lines serve as diagnostic tools to compare parameter studies. Thereby, a classification scheme by line morphology was found: A line profile is triangular, double-horned, bumpy, shoulder-like or double-peaked. Both parts of the work can be connected in further research: results from GRMHD simulations e.g. the velocity field of the flow serve as an input for Kerr ray tracing. Then, realistic spectra are feasible that originate from the vicinity of black holes.
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