<> "The repository administrator has not yet configured an RDF license."^^ . <> . . "Nonthermal Processes Near Supermassive Black Holes"^^ . "In recent years, γ-ray astronomy has made considerable progress in the exploration\r\nof the extragalactic γ-ray sky. In particular, active galaxies, whose\r\nrelativistic jets/outflows are significantly inclined with respect to the lineof-\r\nsight, have revealed remarkable flaring activity at γ-ray energies. The\r\nobserved rapid variability of the γ-ray emission, comparable to timescales of\r\nthe light travel time across the black hole horizon, provides a strong motivation\r\nfor testing radiative scenarios associated with the vicinity of the central\r\nsupermassive black hole. In this doctoral study, we explore the so-called\r\nblack hole magnetospheric scenario. Accordingly, strong particle acceleration\r\nmay occur within the black hole magnetosphere in regions of unscreened\r\nelectric fields (gaps). This can happen either at the null surface across which\r\nthe charge density changes sign or at the stagnation surface which separates\r\nthe inwardly from the outwardly moving matter. The acceleration of leptons\r\nis accompanied by γ-ray emission via inverse Compton scattering of the ambient\r\n(disk) soft photons as well as curvature radiation. This thesis explores\r\nthe potential of these processes to account for the observed γ-ray features.\r\nBy developing and studying an one-dimensional, steady model for magnetospheric\r\nparticle acceleration and emission, as well as, estimating the terminal\r\nLorentz factors of the accelerated charges and the maximum extractable gap\r\npower, we find that magnetospheric processes can be responsible for the observed,\r\nrapidly variable very-high-energy γ-ray emission in the radio galaxy\r\nM87."^^ . "2019" . . . . . . . "Grigorios"^^ . "Katsoulakos"^^ . "Grigorios Katsoulakos"^^ . . . . . . "Nonthermal Processes Near Supermassive Black Holes (PDF)"^^ . . . "PhD_Thesis.pdf"^^ . . . "Nonthermal Processes Near Supermassive Black Holes (Other)"^^ . . . . . . "indexcodes.txt"^^ . . "HTML Summary of #27354 \n\nNonthermal Processes Near Supermassive Black Holes\n\n" . "text/html" . . . "520 Astronomie"@de . "520 Astronomy and allied sciences"@en . . . "530 Physik"@de . "530 Physics"@en . .