Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982cha%26a...6..247z&link_type=abstract
Chinese Astronomy and Astrophysics, Volume 6, Issue 3, p. 247-254.
Astronomy and Astrophysics
Astrophysics
Scientific paper
For 60 Class DII radio sources, I calculate the linear size of the radio components d in the direction perpendicular to the line joining the components. I find 1) d⊥ has an upper limit of 150 kpc and a lower limit of 4~ 6 kpc, and 2) d⊥, is correlated with the luminosity Mv of the central body, smaller components being associated with lower luminosities. This correlation is shown both by the regression of Mv on d⊥, for 13 sources with redshifts between 0.35 and 0.60 and by an upper envelope in the Mv - d⊥ plot for the entire sample. This result is in conflict with the usual expanding models of radio lobes. An alternative model is proposed here: a radio lobe is taken to be a mass of turbulent plasmon formed with the intergalactic medium behind the shock front excited by an energy-carrying beam from the central body. The size of the lobe varies with the drilling velocity at the tip of the beam, which in turn depends on the energy transported within the beam. As the central body gets depleted, both its luminosity and the energy injected into the beam become less and the lobe gets smaller. An exponentially decaying central store can reproduce the observed statistical relation.
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