H.E.S.S. discovery of VHE γ-rays from the quasar PKS?1510?089

摘要

The quasar PKS?1510?089 (z?=?0.361) was observed with the H.E.S.S. array of imaging atmospheric Cherenkov telescopes during high states in the optical and GeV bands, to search for very high energy (VHE, defined as E?≥?0.1?TeV) emission. VHE γ-rays were detected with a statistical significance of 9.2 standard deviations in 15.8 h of H.E.S.S. data taken during March and April 2009. A VHE integral flux of I(0.15?TeV