Emission mechanisms in gamma-ray emitting Blazars:
In the last years, a number of Blazars have been detected at very high TeV energies.
These form a special class of active galactic nuclei whose relativistic jet is oriented almost
exactly along the line of sight to the observer. The detection of these sources is very important
as they can be used to set constraints on the intensity and spectrum of
the diffuse Extragalactic Background Light shedding light on its main origin.
In spite of the importance of high-energy emitting Blazars for cosmological applications,
the mechanism(s) giving rise to the high-energy emissions are not yet fully understood. A wide
variety of competing models (hadronic versus leptonic) are discussed. To constrain some of them,
high signal-to-noise optical spectra of a handful of TeV emitting Blazars have been secured
using the Large Binocular Telescope. In this Bachelor thesis, the spectra of these sources
shall be reduced and analyzed. Of particular importance is the determination of emission line
fluxes from the broad line region in these sources, which are direct ingredients of some of the
emission models discussed.
Note: This project can be combined with a physics practical.
The Seyfert II galaxy NGC 2273: NGC 2273 hosts an Syfert II nucleus and is one of the proto-types of its class. Due to its proximity to us, the very center of this active galaxy can be studied on pc-scales using near-infrared adaptive-optics supported high-resolution data from the Large Binocular Telescope. In this bachelor thesis the available data shall be reduced and analyzed with special emphasis on the inner structure of the galaxy via dedicated modeling to derive eg inner spiral arms and bars and to interpret the results in terms of the fueling mechanism for the active core.