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T: Fachverband Teilchenphysik

T 72: Gammaastronomie I

T 72.6: Vortrag

Montag, 3. März 2008, 18:00–18:15, KGII-HS 2006

Discovery of Two New TeV Blazars with the H.E.S.S. Cherenkov Telescopes — •Martin Raue1, Wystan Benbow1,2, Luigi Costamante1,3, and Dieter Horns4 for the H.E.S.S. collaboration — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2now at Harvard-Smithsonian Center for Astrophysics, USA — 3now at HEPL/KIPAC, Stanford, USA — 4Institut für Experimentalphysik, Universität Hamburg, Germany

Since the new generation of imaging atmospheric Cherenkov telescopes came online with the commissioning of the four telescopes of the H.E.S.S. experiment in 2004, the number of known extragalactic gamma- ray emitters in the very high energy (VHE) domain has more than doubled. All of the sources detected so far are active galactic nuclei and all but one belong to the class of BL Lac objects. The emission process for VHE gamma-rays in this class of objects is not fully understood and a large sample of sources and multi-wavelength data is needed to discriminate between different models. Furthermore, VHE photons from these distant sources are attenuated via pair production with the extragalactic photon field in the optical to infrared wavelength band (extragalactic background light, EBL), which contains cosmological information on the star and galaxy formation history. With assumptions about the source physics, limits on this photon field can be derived. We report the detection of VHE gamma-rays from the BL Lac 1ES 0229+200 (z = 0.1396) and 1ES 0347-121 (z = 0.1880) with the H.E.S.S. Cherenkov telescope system. Details on the source properties are presented and implications for the EBL limits are discussed.

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DPG-Physik > DPG-Verhandlungen > 2008 > Freiburg