High zenith angle observations of PKS 2155-304 with the MAGIC telescope

Details High zenith angle observations of PKS 2155-304 with the MAGIC telescope High zenith angle observations of PKS 2155-304 with the MAGIC telescope

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1085..557h&link_type=abstract

HIGH ENERGY GAMMA-RAY ASTRONOMY: Proceedings of the 4th International Meeting on High Energy Gamma-Ray Astronomy. AIP Conferenc

Astronomy and Astrophysics

Astronomy

Radio Telescopes And Instrumentation, Heterodyne Receivers, Gamma-Ray, Active And Peculiar Galaxies And Related Systems

Scientific paper

The high frequency peaked BL Lac PKS 2155-304 with a redshift z = 0.116 was discovered 1997 in the VHE range by the University of Durham Mark 6 gamma ray telescope in Australia with a flux corresponding to ~0.2 times the Crab Nebula flux [1]. It was later observed and detected with high significance by the Southern observatories CANGAROO and H.E.S.S. establishing this source to the best studied Southern TeV blazar. Detection from the Northern hemisphere was very difficult due to challenging observation conditions under large zenith angles. In July 2006, the H.E.S.S. collaboration reported an extraordinary outburst of VHE gamma-emission [2]. During the outburst, the VHE gamma ray emission was found to be variable on the time scales of minutes and at a mean flux of ~7 times the flux observed from the Crab Nebula [2]. The MAGIC collaboration operates a 17 m imaging air Cherenkov Telescope at La Palma (Northern Hemisphere). Follow up observations of the extraordinary outburst have been triggered in a Target of Opportunity program by an alert from the H.E.S.S. collaboration. The measured spectrum and light curve are presented.

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