Physical processes in the ISM

Session

Poster Session: Cosmic rays and their impact on the ISM (Poster 52)

23 Oct 2013, 09:00

MPE

82. Gamma-ray emission from the vicinity of Westerlund 1

Stefan Ohm (Dept of Physics and Astronomy, University of Leicester)

23/10/2013, 09:00

Poster

Westerlund 1 (Wd 1) is the most massive stellar cluster in the Galaxy and associated with an extended region of TeV emission. Here we report the results of a search for GeV $\gamma$-ray emission in this region. The analysis is based on ~4.5 years of Fermi-LAT data and reveals significantly extended emission which we model as a Gaussian, resulting in a best-fit sigma of $\sigma$_S = $(0.475 \pm...