Probing Extragalactic Background Light with 1ES 0229+200
November 2007 Model for the evolution of the luminosity of galaxies in the Universe. The plot shows the luminosity per unit volume as a function of wavelength and redshift, i.e. time. The luminosity basically…
Gamma Rays from the Distant BL Lac 1ES 0347-121
October 2007 To disentangle the processes at work in gamma-ray sources, multi-wavelength observations over a wide range of frequencies are required. In the investigation of the active galaxy 1ES 0347-121, contemporaneous observations with the …
TeV gamma rays from the core of M87
November 2006 The radio galaxy M87 viewed at radio wavelengths at different scales, successively zooming into smaller structures in the jet emerging from the supermassive black hole at the core of the galaxy. The…
Multiwavelength observations of H2356-309
January 2006 The ROTSE III robotic optical telescope on the H.E.S.S. site. ROTSE is a network of four 45 cm robotic, automated telescopes built for fast optical follow-up measurements in response to gamma ray…
The Blazar 1ES 1101-232 and the Gamma Ray Horizon
December 2005 The “gamma ray horizon” defined as the distance (measured in redshift z) over which a gamma ray of a given energy will typically propragate before interacting with a photon of the extragalactic…