Karlsruhe 2011 – scientific programme

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T: Fachverband Teilchenphysik

T 92: Neutrinoastronomie I

T 92.5: Talk

Monday, March 28, 2011, 17:45–18:00, 30.41: 105

(contribution withdrawn) Searching for cosmic neutrinos from the Galactic Center: the Fermi Haze/Bubbles analysis with IceCube-DeepCore. — •Claudine Colnard — Max-Planck-Institut für Kernphysik, Heidelberg

Bilateral and very extended regions of diffuse gamma ray emission have recently been observed around the Galactic Center. The origin of these Fermi Bubbles is yet to be discovered. A possible scenario involves the acceleration of cosmic rays in supernova outflows interacting with giant molecular clouds that result in powerful stellar winds. Only the detection of cosmic neutrinos coming from the inner region of the Galaxy would carry a clear signature for such an hadronic mechanism.

We report in this talk about a singular approach to observe the Fermi Haze/Bubbles at intermediate energies with the IceCube neutrino observatory. The compact Cherenkov detector DeepCore at the bottom center of IceCube will be used to enhance the sensitivity of the neutrino telescope and open its field of view to the Galactic Center below 1PeV. The outer layers of IceCube will provide a veto volume to discriminate the expected cosmic neutrino signal against the much higher atmospheric muon background. Under certain conditions, this veto technique will also allow to reduce the flux of downward-going atmospheric neutrinos which constitute generally an irreducible background in neutrino astronomy. To enhance further the performance of IceCube-DeepCore, the newly developed Multi Point Sources method will be applied.