Other
Scientific paper
Feb 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.4702g&link_type=abstract
American Astronomical Society, HEAD meeting #11, #47.02; Bulletin of the American Astronomical Society, Vol. 41, p.738
Other
1
Scientific paper
The high-sensitivity exploration of the very-high-energy (VHE) gamma-ray sky pioneered by the H.E.S.S. telescopes continues to yield new discoveries. These include the detection of VHE emission from a starburst galaxy, NGC 253, and from the radio galaxy Centaurus A, in addition to the more numerous VHE blazars. Beyond the clues which the VHE emission yields on particle acceleration in these objects, the population of detected VHE blazars yields upper bounds on the Extragalactic Background Light, and a bright flare of PKS 2155-304 yielded limits on the possible energy-dependence of the speed of light in quantum gravity.
The Southern hemisphere location of H.E.S.S. gives it an unrivalled view of the inner Galaxy, which has revealed a numerous and varied population of Galactic VHE gamma-ray sources. These hold the prospect of identifying the sources of Galactic cosmic rays (CRs), and VHE emission has indeed been detected from the shells of supernova remnants (SNRs), including SN 1006 and the first SNR shell discovered in gamma-rays, HESS J1731-347. The nature of the VHE emission from SNR shells is still debated, however, and the discovery of VHE emission from a number of SNRs interacting with molecular clouds can yield a stronger clue to a hadronic CR origin. Several star-forming regions have also recently been found to have associated VHE emission, which can probe possible collective CR acceleration processes in the accompanying "superbubbles". The most numerous class of Galactic VHE sources nonetheless appear to be pulsar wind nebulae (PWNe), whose gamma-ray emission likely originates from high-energy electrons and positrons. Indeed, nearby VHE PWNe such as Vela X may significantly contribute to the CR electron and positron flux at Earth, whose high-energy spectrum has recently been measured by H.E.S.S.
This talk will give an overview of these and other recent results obtained with the H.E.S.S. telescopes.
E. S. S Collaboration H.
Gallant Yves A.
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