Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984ap%26ss.100..351p&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 100, no. 1-2, March 1984, p. 351-357.
Astronomy and Astrophysics
Astronomy
4
Plasma Jets, Radio Sources (Astronomy), Shock Waves, Astronomical Models, Cygnus Constellation, Interstellar Magnetic Fields, Supersonic Jet Flow
Scientific paper
The most luminous radio sources, such as Cygnus A and 3C 295, are characterized by two hot spots in the outer parts of the radio lobes. Assuming that hot spots are produced by a strong shock in a supersonic jet and that the post shock pressure is dominated by relativistic particles, the authors present an analysis which allows a determination of physical parameters inside the hot spot. It is found that: (1) the velocity of the upstream flow in the reference frame of the shock is u1 ≅ 0.2c and thus the jet velocity is ujet ≅ 0.25c; (2) the density of thermal electrons inside the hot spot is n2 ≅ 5×10-3 e- cm-3 and thus the mass ejected per year to power the hot spot is ≅4 M0 yr-1; (3) the power law spectrum of relativistic electrons continues down to 30 MeV; and (4) the energy density of relativistic protons is lower than the energy density of relativistic electrons.
Pelletier Guy
Roland Jérémie
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