Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21323501g&link_type=abstract
American Astronomical Society, AAS Meeting #213, #235.01; Bulletin of the American Astronomical Society, Vol. 41, p.507
Astronomy and Astrophysics
Astronomy
Scientific paper
More than half of the Galactic TeV sources are now associated with supernova remnants (SNRs) or pulsar wind nebulae (PWNe). Of pulsars with the highest spin-down luminosity, most are found to be TeV emitters, and remarkably, new examples of energetic pulsars are currently being located by their TeV emission. This growing number of associations provides a unique opportunity to determine the mechanism(s) for generating gamma-ray photons. Relativistic electrons can produce gamma-rays via non-thermal bremsstrahlung or by inverse-Compton scattering off ambient photons, possibly IR photons from massive star clusters, also a ready supplier of neutron stars. Inverse-Compton can account for the extended TeV sources. The synchrotron lifetime of electrons in a weak magnetic field allows their TeV emission to persist, preserving the memory of long faded PWNe, well offset from the current pulsar locations. Gamma-rays also result from the decay of neutral pion products in hadronic collisions of high-energy protons off local, possibly SNR, material. Some extended sources may also be explained by multiple nearby pulsars. The X-ray power-law spectra of TeV discovered pulsars range from the unexpectedly flat to the AXP-like steep. This talk provides 1) a brief review of the identification of TeV sources with PWNe and their interaction with the local environments, and 2) the latest discoveries and ongoing efforts to identify unclassified Galactic TeV sources with a pulsar origin.
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