Paper:	The HII Region of 3C 345: Radio Variability and Recombination Lines
Volume:	360, AGN Variability from X-Rays to Radio Waves
Page:	157
Authors:	Matveyenko, L.I.
Abstract:	Studies of the fine structure of QSS 3C 345 show that the brightness of compact components at low frequencies is Tb ≤ 1012 K. The core, i.e., the nozzle and jet, consists of a stream of relativistic plasma surrounded by a thermal plasma like a cocoon wall. The wall absorbs synchrotron radio emission in continuum and recombination lines. The absorption in lines H(78.79)α is measured. The ratio of the line to continuum emission is 0.3%, the line width is Δv = 5.3 MHz, and the frequency difference corresponds to Δz = 0.0013.

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