Identification of new TeV gamma-ray sources in the Galactic Plane

The first TeV gammaray survey of the inner part of our Galaxy, recentlyperformed with HESS, yielded eight new sources, seven of which have beenidentified with radio, Xray and soft gammaray sources. However, TeV J1614518,a bright, hardspectrum, extended source, has strikingly elluded identification,notably in the radio and ROSAT bands. We propose XMMNewton observations tosearch for its Xray counterpart. An identification would provide keyinformation about the source type, the spectral high energy distribution and thesource spatial structure. Otherwise, the lack of an Xray counterpart wouldseverely challenge lepton acceleration models and point towards hadronicacceleration or a new, dark class of cosmic ray sources. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]