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38. Woche 2018


Donnerstag, 20.09.

 Special Seminar

Zeit, Ort:

15:00 Uhr,  Central seminar room, library building

Redner:

Prof. Edmund Myers, Dept. of Physics, Florida State University

Titel:

A proposal to test CPT with the Molecular Antihydrogen Ion

Freitag, 21.09.

 Astrophysics Seminar

Zeit, Ort:

11:00 Uhr,  Central Seminar Room

Redner:

Silvia Celli, Gran Sasso Science Institute, L'Aquila, Italy

Titel:

ACCELERATION, PROPAGATION AND RADIATION OF PARTICLES IN SUPERNOVA REMNANTS WITH CLUMPY STRUCTURE

Observations from the radio to the gamma-ray wavelengths indicate that supernova remnant (SNR) shocks are sites of effective particle acceleration. It has been proposed that the presence of dense clumps in the environment where supernovae explode might have a strong impact in shaping the hadronic gamma-ray spectrum. I will present a detailed numerical study about the penetration of relativistic protons into clumps which are engulfed by a SNR shock, taking into account the magneto-hydrodynamical properties of the background plasma. The implications for the formation of the spectrum of hadronic gamma rays will be discussed, as it does not reflect anymore the acceleration spectrum of protons, resulting substantially modified inside the clumps due to propagation effects. For the Galactic SNR RX J1713.7-3946, I will show that a hadronic scenario including dense clumps inside the remnant shell is able to reproduce the broadband gamma-ray spectrum from GeV to TeV energies. Finally, I will comment on particle escape from SNRs, as it constitutes one of the less understood piece of the shock acceleration theory. A phenomenological model for particle escape from a SNR shock is discussed in order to study how does the escape process reflect into the gamma-ray spectrum produced by accelerated hadrons.

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