Computer Science
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..407m&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Computer Science
Scientific paper
Recent polarization measurements of the near-infrared emission of SgrA* found that its emission is highly polarized during flares and consists of a contribution of a non- or weakly polarized main flare with highly polarized sub-flares. The flare activity showed again a quasiperiodicity of ca. 20 minutes. We show that a two component hot spot/disc model in which the quasiperiodic flux density variations can be explained due to a spot on a relativistic orbit around the central MBH is well suited to model the emission. In this picture the hot spot is polarized to a degree of roughly 60% while the disc is unpolarized. We discuss all general relativistic effects that imprint on the polarization degree and angle. Assuming an azimuthal or a constant horizontal magnetic field respectively we fit the inclination angle and the spin parameter. Finally we discuss some caveats.
Dovciak Michal
Duschl Wolfgang J.
Eckart Andreas
Karas Vladimir
Meyer Leonhard
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