München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 85: Gamma-Astronomie 4

T 85.8: Talk

Wednesday, March 11, 2009, 18:30–18:45, M218

High energy gamma-ray and neutrino emission from the Local Supercluster — •Tanja Kneiske, Dieter Horns, Jörg Kulbartz, and Guenter Sigl — Department Physik, Luruper Chaussee 149, 22761 Hamburg, Germany

Recently, a correlation of the arrival directions of ultra high energy cosmic rays (UHECR) with nearby AGN has been claimed. Most of these galaxies belong to the Local Supercluster (LSC) which is centered on the Virgo galaxy cluster. If indeed, UHECR are accelerated and confined to the LSC, gamma-rays and neutrinos are ideal probes to investigate its total cosmic ray content. We calculate the signatures of gamma-rays produced in proton-photon interactions modeling for the first time a realistic target photon field including the optical to far-infrared extragalactic radiation as well as the contribution of member galaxies in the super-cluster. The observable secondary particle spectra from the electromagnetic cascade are calculated and compared with existing observational constraints including gamma-ray, cosmic-ray, and neutrino measurements.