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MPINP:
Hochenergie-Astrophysik Theorie - Abteilung Hofmann
要旨:
Outflows are ubiquitous phenomena in the universe. They have been widely observed in both
Galactic and extragalactic objects. In this thesis, we analyze three individual sources. Firstly,
we re-analyze the high energy gamma-ray data of Fermi-LAT on the giant lobes of Centaurus A. We
utilize for the first time the Planck observations to derive the fluxes of the lobes. The multiwavelength
SEDs reveal a possible leptonic+hadronic origin of the non-thermal emission. Secondly,
we re-analyze Chandra observations of the M87 jet with a total exposure time of 1500 kiloseconds
to explore the X-ray emission characteristics along the jet. The variabilities of the nucleus
and HST-1, as well as the photon spectra for all knots are investigated. Fitting the radio to Xray
SEDs assuming a synchrotron origin, we show that a broken power-law electron spectrum
allows a satisfactory description of the SEDs for most knots except for B, C and D, for which an
additional component is needed. We discuss the implications and suggest that a stratified jet
model may account for the differences. Finally, we derive the energy distribution of ultrarelativistic
electron in G1.9+0.3, which is the youngest known SNR in the Galaxy, under the assumption
that the detected X-ray with Chandra and NuSTAR are of entirely synchrotron origin. The
electron acceleration is found to be an order of magnitude slower than the maximum rate provided
by the shock acceleration in the nominal Bohm diffusion regime. We discuss the resultant
implications in the context of contribution of SNRs to the Galactic Cosmic Rays at PeV energies.
