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Published October 1977 | Published
Journal Article Open

The low-frequency structure of powerful radio sources and limits to departures from equipartition


Recent interplanetary scintillation and spectral data have been combined to derive information about source structures at frequencies below 100 MHz. For an appreciable fraction of sources there is evidence of extended components which are prominent at low frequencies but which have not been detected in higher frequency interferometric observations. Sources having low-frequency spectral turnovers are studied in detail and in several cases it is shown that the total energy is within a factor 30 of the energy of equipartition between the particles and magnetic fields. In no case is there conclusive evidence of departure from equipartition.

Additional Information

© 1977 Royal Astronomical Society. Provided by the NASA Astrophysics Data System. Received 1977 February 4. We thank Professor Sir Martin Ryle for stimulating discussions which led to this study, and Ors Longair, Scheuer and Shakeshaft for their active interest and helpful suggestions. ACSR gratefully acknowledges his debt to the Royal Society for a research fellowship supported by the Weir Foundation, and MAS acknowledges the receipt of a Science Research Council Studentship.

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