ausblenden:
Schlagwörter:
-
MPINP:
HESS - Abteilung Hofmann
Zusammenfassung:
Very High Energy (VHE) γ-ray astronomy using Imaging Atmospheric Cherenkov Telescopes
(IACTs) is entering an era of hybrid arrays (such as H.E.S.S. II and CTA), comprising
telescopes of varied specifications to enhance the accessible energy range and angular
resolution. New algorithms for telescope optical efficiency calibration are developed and
adapted for multi-type arrays, for both absolute light yield calibration using muons, and
for relative calibration through comparison of shower images. In comparison to previous
methods, the stability and flexibility of these algorithms are considerably improved. These
will play an important role for the future CTA observatory. The use of multi-type IACT
arrays in providing an increased understanding of astrophysical objects and environments
is demonstrated through an in-depth study of the Pulsar Wind Nebula HESS J1825-137,
known to be highly extended with the presence of strong energy dependent morphology.
In particular, measurements of HESS J1825-137 across the entire available energy range
allow the particle transport inside the nebula to be constrained, favouring advection over
diffusion as the dominant mechanism. Together with X-ray data, a map of the magnetic
field of the nebula can be made through spectral modelling. It will also be shown that
HESS J1825-137, at 100 pc across, is one of the biggest pulsar wind nebulae to have been
discovered yet.
