Münster 2017 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 37: Kosmische Strahlung 4
T 37.6: Vortrag
Dienstag, 28. März 2017, 12:15–12:30, H 4
Non-thermal radiation from cloud-disk collisions in active galactic nuclei — •Ana Laura Müller1,2 and Gustavo Esteban Romero1,3 — 1Instituto Argentino de Radioastronomía (CCT-La Plata, CONICET; CICPBA), Villa Elisa, Argentina — 2Karlsruher Institut für Technologie, Karlsruhe, Germany — 3Facultad de Ciencias Astronómicas y Geofísicas (Universidad Nacional de La Plata), La Plata, Argentina
The ultraviolet and optical spectra of active galactic nuclei (AGN) have prominent broad emission lines, produced close to the central black hole. The emitting gas is contained in the so-called broad line region (BLR). Clouds with velocities in the range from ∼ 1000 km s−1 to ∼ 5000 km s−1 exist within this region. Because of the random velocity distribution of the clouds, direct collisions with the accretion disk feeding the AGN should occur. Assuming the typical parameters for clouds and an accretion disk, we estimate that ∼ 1043 erg can be released per impact. The collision produces two shock waves, one propagating through the disk and the other moving through the cloud. This scenario might be in principle favorable to the acceleration of particles by first order Fermi mechanism. We present estimates of the cosmic ray production inside the shocked cloud and model the non-thermal emission. We also offer a brief discussion of the contribution of this process to the total variability of AGNs.