Abstract
When thermal relativistic electrons with isotropic distribution of velocities move through a dense gas region or impinge on the surface of a cloud of dense gas, the effect will produce peculiar atomic or ionic emission lines, which we call the Cerenkov linelike Besides the iron K lines in active galactic nuclei (AGNs) and in the afterglow of gamma-ray bursts (GRBs), explored in our previous papers, contribution of the linelike radiation to other observed lines may also be significant. In order to extend the application of the new line emission mechanism to the optical region, in this paper we present a corrected formula system, suitable for describing the optical line radiation. We point out that the line mechanism is unable to produce the optical high-ionization lines, e.g., C IV , O III, and N V, because the plasma oscillation in the highly ionized plasma suppresses the radiation significantly. However, for the hydrogen lines and other low-ionization lines, e.g., Mg II and O I, produced in the low-ionized plasma, the line mechanism has to be taken into account.
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