Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 45: Gamma Astronomy 2

T 45.4: Vortrag

Dienstag, 22. März 2022, 17:00–17:15, T-H30

Analysis of the high energy γ-ray emission from HESS J1813-178 with H.E.S.S and Fermi-LAT data — •Tina Wach, Vikas Joshi, Alison Mitchell, and Stefan Funk — Erlangen Center for Astroparticle Physics

HESS J1813-178 is one of the brightest and most compact objects detected by the HESS Galactic Plane Survey. Within the extent of the TeV emission lies a young Supernova Remnant G12.8-0.02 and a pulsar wind nebula driven by a pulsar with the second highest spin-down luminosity of known pulsars in the Galaxy PSR J1813-1749. The origin of the TeV emission is still not clear. Because of the young age of the system, the pulsar wind nebula and the Supernova Remnant overlap and present a good opportunity to examine how the interactions between these two components influence the acceleration of particles in the system. In previous analyses, a discrepancy in extension has been observed between a point-like component seen in TeV γ-rays measured by H.E.S.S and a extended component in GeV γ-ray observations from the Fermi-LAT satellite. We used 3 dimensional map-based analysis with gammapy to do a morphological and spectral analysis of this region in GeV and TeV energy ranges, as well as a joint-analysis of both datasets. We find a new significant extended emission component in the TeV energy range, with a morphology close to the GeV energy range. While the question of the origin of the very high γ-ray emission from HESS J1813-178 could not be answered yet, our analysis allows a consistent description and a smooth energy spectrum of the region across five decades of energy.