Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pazh....5..563k&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 5, Nov. 1979, p. 563-566.) Soviet Astronomy Letters, vol. 5, Nov.-Dec. 1979, p. 301-303
Astronomy and Astrophysics
Astronomy
Elliptical Galaxies, Galactic Radiation, Plasma Jets, Radio Galaxies, Synchrotron Radiation, Faraday Effect, Galactic Structure, High Energy Electrons, Light Emission, Plasma Density, Radio Emission
Scientific paper
The synchrotron radiation emitted from the knots in the jet observed in the radio galaxy M 87 is examined. Considerations of the variations of magnetic field strength and quasi-shell structure with length in the knots are presented which demonstrate that the radio and optical luminosities of the knots rise towards the jet periphery. Observations of the increase in radio emission with increasing distance of the knot from the center of M 87 are shown to confirm the theoretical relation, while the observed increase then sudden decrease in knot optical apparent magnitudes is explained by a possible scatter in quasi-shell thicknesses or the presence of rapidly moving electron clouds. It is shown that if the plasma density in all the knots is the same, the amount of Faraday rotation will also be the same and account for the observed constant rotation of the 5-GHz radio emission with respect to the optical emission. Estimated knot scales are also found to be in agreement with observed diameters.
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