Location of Particle Acceleration in Radio Hot Spots.

Details Location of Particle Acceleration in Radio Hot Spots. Location of Particle Acceleration in Radio Hot Spots.

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5931m&link_type=abstract

HST Proposal ID #5931

Physics

Hst Proposal Id #5931 Agn

Scientific paper

A wide variety of AGN phenomena -- e.g. the powerful double radio sources, the superluminal jets in quasars, and last but not least the unexpected powerful Gamma -ray emission of many blazars -- cannot be explained without the presence of ultrarelativistic particles (electrons, protons and perhaps positrons). But it is still a mystery how the underlying cosmic particle accelerators work. Since the most efficient acceleration processes take place in hot spots of extended radio sources (reaching E_max > 10^5 m_ec^2) and these hot spots are relatively large (> 1 kpc) they are the prime target in order to study the acceleration process and its spatial structure in detail. For the nearest hot spots the required spatial resolution of 100 pc corresponds to about 0sec point 1 which is reached by the VLA at high radio frequencies and with the HST at optical frequencies. We propose to obtain high S/N images of the nearest two optically detected hot spots in 3C 111 and Pictor A in two bandpaths with WFPC2. They will allow us to derive maps of the radio-optical and optical spectral index with a resolution of 1/10 of the hot spot diameter. Such spectral index maps are the crucial observational input for the decision between competing models of the acceleration mechanisms and should lead to a quantitative description of the underlying physics.

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