Discovery of very high-energy gamma-ray emission from the LBL object BL Lacertae

Details Discovery of very high-energy gamma-ray emission from the LBL object BL Lacertae Discovery of very high-energy gamma-ray emission from the LBL object BL Lacertae

2007-09-14

arxiv.org/abs/0709.2265v1

Astronomy and Astrophysics

Astrophysics

4 pages, 5 figures, to appear in the proceedings of the 30th International Cosmic Ray Conference, Merida, July 2007, on behalf

Scientific paper

The low-frequency peaked BL Lac (LBL) object BL Lacertae was observed with the MAGIC telescope from 2005 August to December (22.2 hr), and from 2006 July to September (26.0 hr). A very high energy (VHE) gamma-ray signal was discovered with a 5.1 sigma excess in the 2005 data. Above 200 GeV, an integral flux of (0.6+-0.2)x10e-11 m-2 s-1 was measured, corresponding to approximately 3% of the Crab flux. The differential spectrum between 150 and 900 GeV is rather steep, with a photon index of -3.6+-0.5. The light curve shows no significant variability during the observations in 2005. For the first time a clear detection of VHE gamma-ray emission from an LBL object was obtained. The 2006 data show no significant excess. This drop in flux follows the observed trend in optical activity

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