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T: Fachverband Teilchenphysik

T 85: Gammaastronomie 5

T 85.5: Vortrag

Donnerstag, 7. März 2013, 17:45–18:00, HSZ-E05

Search for gamma-ray emission from the powerful AGN outburst in the Hydra A galaxy cluster — •W. Domainko¹, M. Ali², S. Ohm³, L. Stawarz⁴, J. Hinton³, and P. Eger¹ — ¹MPIK Heidelberg — ²University of Leeds — ³University of Leicester — ⁴University of Krakow

In some galaxy clusters powerful AGN have blown bubbles with cluster scale extent into the ambient medium. The main pressure support of these bubbles is not known to date, but cosmic rays are a viable scenario, implying copious gamma-ray emission. Hydra A, the closest galaxy cluster hosting a cluster scale AGN outburst, located at a redshift of 0.0538, is investigated for being a gamma-ray emitter with H.E.S.S. and the Fermi Large Area Telescope (Fermi-LAT). No signal has been found in in 20.2 hours of H.E.S.S. observations and 38 months of Fermi-LAT data. Upper limits on the gamma-ray flux are derived and are compared to models. The non-detection of Hydra A in gamma-rays has important implications on the particle populations and physical conditions inside the bubbles in this system.