München 2009 – scientific programme

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T: Fachverband Teilchenphysik

T 82: Gamma-Astronomie 1

T 82.7: Talk

Monday, March 9, 2009, 18:35–18:50, M218

H.E.S.S. Unidentified Sources. — •Omar Tibolla — Max-Planck-Institut fuer Kernphysik, P.O. Box 103980, D-69029 Heidelberg, Germany

H.E.S.S. is currently the most sensitive instrument in the very-high-energy (VHE; > 100 GeV) gamma-ray domain and has revealed many new sources along the Galactic Plane. After the very successful first VHE Galactic survey of 2004/2005, H.E.S.S. continued and extended that survey in 2006/2007, discovering a number of new sources, many of which are unidentified.

While some of the unidentified H.E.S.S. sources present several positional counterparts and hence several different possible scenarios; so theiridentification is still unclear; some other instead have no counterparts at any other wavelength; especially the lack of an X-ray counterpart put serious constraints, suggesting an hadronic nature for this kind of sources and allowing the so called dark accelerator scenario in which only the protons are accelerated at VHE giving rise to a light signal visible only at TeV energies, but not at any other wavelength.