Narrow Results

H.E.S.S., a system of imaging Cherenkov telescopes, is dedicated to the observation of TeV gamma-rays. Within the first years of operation a number of objects were detected, most of these objects were previously not known to be TeV emitters. The observed TeV emission is crucial for the understanding of particle acceleration in the sources.

Here I will review the results obtained on Galactic sources expected to show variable emission. Variable emission was detected with high significance from the binary systems PSR B1259−63 / SS 2883 and LS5039. The emission of the latter object appears to be periodic in accordance with the orbit. No pulsed emission from pulsars was detected so far. For three pulsars (PSR B0531+21, PSR B0833−45, PSR B1706−44) upper limits on the TeV emission at the EGRET pulse phases were derived.

Since 2003, the H.E.S.S. array of 4 Cherenkov telescopes, located in Namibia, has detected about 60 sources of very-high-energy gamma-rays from 100 GeV to about 30 TeV, both galactic and extragalactic. Some recent H.E.S.S. results are reviewed: the detections of shell-type supernova remnants (SN 1006 and HESS J1731-347), of the starburst galaxy NGC 253 and of new Active Galactic Nuclei. In addition, deeper variability studies on the blazar PKS 2155-304 are presented, which give some insight into the emission mechanisms at play.