indico  First event Previous event Thesis defense Next event Last event   | view:  |  manage export to personal scheduler  | 
user login 


Licentiate thesis: A Search for Dark Matter Lines with H.E.S.S II
  Thesis defense

Wednesday 12 October 2016
from 10:15 to 12:00
at FB42
Speaker : Knut Dundas Morå (Stockholm University, Department of Physics)
Abstract : small or no interactions with standard model particles. Dark matter is an integral part of the current understanding of cosmology, and leaves signs in the movements of stars and galaxies, as well as the Cosmic Microwave Background. The erakly interacting massive particle (WIMP) is a well-studied dark matter model that would be expected to have a mass around the weak scale, 100 GeV. WIMPs annihilating in the galactic center could give rise to monoenergetic gamma-rays in addition to a more extended spectrum. This thesis details a search for a dark matter line in a region 1.5° west of the galactic center using the High Energy Stereoscopic System (H.E.S.S.) imaging air Cherenkov telescope. The inclusion of a fifth telescope in the array enabled the analysis to extend the HESS energy range down to 100 GeV for a spectral line search. At 130 GeV, a limit of 1.38 10^-27 cm^3/s on the velocity-weighted cross-section at 95% confidence limit could be set using15.2 hours of data. The analysis is the first paper using all five telescopes of H.E.S.S. II. The main subject of the thesis has been in optimization of this analysis as well as future H.E.S.S. pointings.

Nordita  | Last modified 21 September 2016 15:46  |  HELP