Mathematics – Logic
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21733003a&link_type=abstract
American Astronomical Society, AAS Meeting #217, #330.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
The major fraction of TeV gamma-ray emitters reported by H.E.S.S. belongs to two source populations - Pulsar Wind Nebulae (PWN) and Active Galactic Nuclei (AGN). The common aspect of the nature of these two essentially different classes of astronomical objects is their deep links to relativistic outflows realized in the forms of pulsar winds and black-hole jets. The high quality morphological, spectral and temporal studies of these objects provided by H.E.S.S. revealed a number of surprise features regarding, first of all, the efficiency of particle acceleration, in the sense of both (i) the total energy released in nonthermal forms, and (ii) maximum energy to which the individual particles are boosted. In some cases we deal with extreme machines in which the particle acceleration proceeds with maximum possible rates allowed by theory. The general properties of PWNe and AGN, as well as gamma-loud binary systems, are discussed with emphasis on their most striking features - the very high radiation efficiency of PWNe in the TeV regime and very short variability and unusually hard intrinsic energy spectra of TeV radiation of blazars.
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