Computer Science
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8023w&link_type=abstract
HST Proposal ID #8023
Computer Science
Hst Proposal Id #8023 Clusters Of Galaxies
Scientific paper
The energetics of the large and spectacular radio jets emanating from the nuclei of radio galaxies, ending in radio lobes larger than the galaxies themselves, are not understood to orders of magnitude. The jets must be electrically neutral, or they would be electrostatically prevented from propagating. It is not known whether the positive particles accompanying the relativistic electrons in the beams are positrons or protons. Models of acceleration processes at the origin of the jets invoke electron-positron pair annihilation. However, it is often assumed that the positive particles in the beam are protons, but without observational evidence. It is energetically important to determine which are the dominant positive particles, since the energy in the beam would differ by a factor 2000. We plan to search for positrons via the positronium Lyman alpha emission near 2432A, and for protons by hydrogen Lyman alpha emission near 1216A, each atom being created by charge exchange by pi cking up an ambient electron as the beam interacts with the surrounding plasma.
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