November 2006: The H.E.S.S. experiment discovers a cosmic timekeeper - the first observation of periodic very high energy gamma ray emission (Astronomy & Astrophysics 460, Nov. 26, 2006, preprint, H.E.S.S. press release, see also MPG, PPARC) )
October 2006: H.E.S.S. discovers drastic variations of very-high-energy gamma rays from the central engine of the radio galaxy M87 (Science Express, Oct. 26, 2006, H.E.S.S. press release, see also MPG ( E, D), Univ. Heidelberg (E, D) , link to reprint under H.E.S.S. journal publications)
April 2006: Measurements of two distant quasars by H.E.S.S. reveal that intergalactic space is more transparent to gamma-rays than previously thought (Nature 440 (2006) 1018-1021, preprint, H.E.S.S. press release, see also MPG, CNRS, PPARC)
February. 06: H.E.S.S. detects gamma-ray afterglow from Galactic Centre gas clouds, indicative a of pre-historic particle accelerator (Nature 439 (2006) 695, H.E.S.S. press release, see also MPG, CNRS, PPARC)
July 05: Discovery of VHE gamma-ray emission from the X-ray binary LS 5039 (Science Express, preprint, H.E.S.S. press release, see also MPG, CNRS, INSU, PPARC)
March 05: Survey of the Galactic plane reveals a new population of TeV gamma-ray sources (Science 307 (2005) 1938, Reprint; H.E.S.S. press release, see also MPG / CNRS/IN2P3/CEA / PPARC)
November 04: first image of a supernova shell in TeV gamma rays (Nature 432, 75 (2004), reprint; press release: MPG / CNRS/IN2P3/CEA / PPARC; APOD)