The H . E . S . S . survey of the Inner Galaxy in very - high - energy gamma - rays

We report on a survey of the inner part of the Galactic Plane in very high energy γ-rays with the H.E.S.S. Cherenkov telescope system. The Galactic Plane between ±30 in longitude and ±3 in latitude relative to the Galactic Centre was observed in 500 pointings for a total of 230 hours, reaching an average flux sensitivity of 2% of the Crab Nebula at energies above 200 GeV. Fourteen previously unknown sources were detected at a significance level greater than 4σ after accounting for all trials involved in the search. Initial results on the eight most significant of these sources were already reported elsewhere (Aharonian et al. 2005a). Here we present detailed spectral and morphological information for Correspondence and request for material should be sent to [email protected] 1 Max-Planck-Institut für Kernphysik, Heidelberg, Germany Yerevan Physics Institute, Yerevan, Armenia Centre d’Etude Spatiale des Rayonnements, CNRS/UPS, Toulouse, France Universität Hamburg, Institut für Experimentalphysik, Hamburg, Germany Institut für Physik, Humboldt-Universität zu Berlin, Germany LUTH, UMR 8102 du CNRS, Observatoire de Paris, Section de Meudon, France University of Durham, Department of Physics, Durham DH1 3LE, U.K. Laboratoire Leprince-Ringuet, IN2P3/CNRS, Ecole Polytechnique, Palaiseau, France APC, Paris Cedex 05, France (7164 (CNRS, Observatoire de Paris)) Dublin Institute for Advanced Studies, Dublin, Ireland Landessternwarte, Königstuhl, Heidelberg, Germany Laboratoire de Physique Théorique et Astroparticules, IN2P3/CNRS, Université Montpellier II, France Laboratoire d’Astrophysique de Grenoble, INSU/CNRS, Université Joseph Fourier, France DAPNIA/DSM/CEA, CE Saclay, Gif-sur-Yvette, France Unit for Space Physics, North-West University, Potchefstroom, South Africa Laboratoire de Physique Nucléaire et de Hautes Energies, Universités Paris VI & VII, France Institut für Theoretische Physik, Lehrstuhl IV, Ruhr-Universität Bochum, Germany Institute of Particle and Nuclear Physics, Charles University, Prague, Czech Republic University of Namibia, Windhoek, Namibia European Associated Laboratory for Gamma-Ray Astronomy, jointly supported by CNRS and MPG