The origin of filaments in extended radio sources

Details The origin of filaments in extended radio sources The origin of filaments in extended radio sources

Jul 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...342..686d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 342, July 15, 1989, p. 686-699. Research supported by FAPESP and SNPq.

Astronomy and Astrophysics

Astronomy

21

Astronomical Models, Radio Galaxies, Radio Jets (Astronomy), Background Radiation, Compton Effect, Inverse Scattering, Radio Bursts, Synchrotron Radiation

Scientific paper

Luminosities, pressures, and expansion rates indicated by observations of extended radio sources are used to make a linear and nonlinear analysis of thermal instability in filaments in extended radio sources. A model is used in which the process which creates approximate equipartition in extended radio sources does not act continuously. Nonlinear calculations show that the maximum density contrast is approximately independent of the initial density perturbation. The maximum nonlinear emissivity constrast is also found to be independent of inverse Compton losses, opposite to results in the linear regime where inverse Compton losses suppress thermal instability. For the inner jet of Cen A, thermal instability creates a density contrast in a distance comparable to the separation distance of the A1 and A4 knots, sufficient to explain the observed filaments.

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