Other
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..apr.s6001v&link_type=abstract
American Physical Society, April Meeting, April 28 - May 1, 2001 Washington, DC Bulletin of the American Physical Society, Vol.
Other
Scientific paper
At TeV energies the Galactic gamma-ray sources found until now are 3 plerion-type Pulsar Nebulae and 3 shell-type Supernova Remnants (SNRs). Except for the Crab Nebula and PSR B1706-44 all of these detections await confirmation by independent research groups. For Pulsar Nebulae the simultaneous detection of synchrotron emission yields an average value for the magnetic field strength in the emission volume. In the Crab Nebula for example, this implies a very reasonable field of 2 × 10-4G. All 3 detected SNRs have also been detected in nonthermal X-rays in the keV-range. Except for Cas A - detected in a deep observation at the centi-Crab level - the gamma-ray emission from the SNRs SN 1006 and RXJ1713.7-3946 appear compatible with Inverse Compton emission from 10 - 100 TeV electrons, rather than with a hadronic origin. However, more spectral and angular information is needed for a definite interpretation. The actual non-detection of several other suspected SNRs can be shown to be still compatible with models for the particle acceleration in these objects which attribute collectively the sources of the Galactic Cosmic Rays to them. Yet e.g. for Tycho's SNR an eventual TeV non-detection by upcoming Cherenkov telescope arrays with a factor 10 higher sensitivity would appear crucial for the predicted SNR origin of Cosmic Rays up to at least 10^14 eV. In a similar sense a "diffuse" TeV Galactic disk emission should then be detected due to the ensemble of unresolved Cosmic Ray sources.
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