Abstract
This paper suggests that the small blueshift of high ionization emission lines with respect to low ionization or HI emission lines in quasars and AGNs can be explained by the Cerenkov line-emission theory. The high ionization emission lines are generated by collisional excitation, but low ionization and HI emission lines are mainly generated by the Cerenkov line emission mechanism. Therefore the latter have a small “Cerenkov redshift” added.
Published Version
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