Prof. Shuang-Nan Zhang (Institute of High Energy Physics, Beijing, China) visit our group and give colloquium speech

Dec 10, 2010

“Two topics on accreting high energy phenomena”

(1) An essential element in the unification scheme of active galactic nuclei (AGNs) is the existence of dusty tori, which have been found in a substantial fraction of all AGNs. However the physical process for the formation of these dusty tori and their roles in the evolution of AGNs are still unclear. I will present a model of the formation and evolution of dusty tori in AGNs, involving the anisotropic radiation from their accretion disks.

(2) Two classes of weakly magnetized neutron star X-ray binaries exist, i.e., atoll and Z sources, according to the shapes of their X-ray color-color diagrams. However the common and different physical properties of these two classes of sources are still not clear. I will address this problem with data analysis and interpretation using disk-magnetosphere interactions of several atoll and Z sources. I will also compare them with accretion disk evolutions in black hole binaries.