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Abstract: Recent observations with atmospheric Cherenkov telescope systems such asH.E.S.S. and MAGIC have revealed a large number of new sources ofvery-high-energy VHE gamma-rays from 100 GeV - 100 TeV, mostly concentratedalong the Galactic plane. At lower energies 100 MeV - 10 GeV thesatellite-based instrument EGRET revealed a population of sources clusteringalong the Galactic Plane. Given their adjacent energy bands a systematiccorrelation study between the two source catalogues seems appropriate. Here,the populations of Galactic sources in both energy domains are characterised onobservational as well as on phenomenological grounds. Surprisingly few commonsources are found in terms of positional coincidence and spectral consistency.These common sources and their potential counterparts and emission mechanismswill be discussed in detail. In cases of detection only in one energy band, forthe first time consistent upper limits in the other energy band have beenderived. The EGRET upper limits are rather unconstraining due to thesensitivity mismatch to current VHE instruments. The VHE upper limits putstrong constraints on simple power-law extrapolation of several of the EGRETspectra and thus strongly suggest cutoffs in the unexplored energy range from10 GeV - 100 GeV. Physical reasons for the existence of cutoffs and fordifferences in the source population at GeV and TeV energies will be discussed.Finally, predictions will be derived for common GeV - TeV sources for theupcoming GLAST mission bridging for the first time the energy gap betweencurrent GeV and TeV instruments.



Autor: S. Funk 1, O. Reimer 2, D.F. Torres 3, J.A. Hinton 4

Fuente: https://arxiv.org/







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