Investigating gamma-ray fluxes from globular clusters
Abstract
Globular clusters are large collections of old stars that are orbiting the core of
a galaxy. Our Milky Way Galaxy has about 160 known clusters, with perhaps more to be
discovered. We first accumulated the necessary parameters for 16 clusters and ran a numerical
model that predicts the inverse Compton gamma-ray flux expected from each cluster. We
also reanalysed data from 16 clusters observed by the H.E.S.S. very-high-energy (>100 GeV)
gamma-ray telescopes. We confirmed the detection of Terzan 5 and found flux upper limits
for the remaining 15 sources that were consistent with published results. We attempted to
constrain some source parameters using X-ray and gamma-ray data. We lastly list the five most
promising clusters for future observations by the Cherenkov Telescope Array
URI
http://hdl.handle.net/10394/32108http://events.saip.org.za/getFile.py/access?resId=36&materialId=10&confId=86