München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 82: Gamma-Astronomie 1

T 82.3: Talk

Monday, March 9, 2009, 17:35–17:50, M218

MAGIC Upper Limits on 13 X-ray bright high peaked BL Lac objects (HBLs) — •Daniel Höhne-Mönch — Universität Würzburg, Germany

Due to their double-peaked spectral energy distribution with the second peak at very high energies (VHE), HBLs are a dedicated source class for observations with imaging air Cherenkov telescopes. From 2006 to 2008, MAGIC observed 13 previously undetected X-ray bright northern HBLs with (i) X-ray flux at 1 keV above 2 uJy and (ii) redshift z<0.4 for observations up to 30 deg zenith angle or z<0.15 for observations up to 45 deg zenith angle. Here we report upper limits on their VHE gamma ray flux above 200 GeV at unprecedented sensitivity and obtain constraints on the local luminosity function of HBLs.