Corrected Formula System for Cerenkov Linelike Radiation in Optical Wave Band

Details Corrected Formula System for Cerenkov Linelike Radiation in Optical Wave Band Corrected Formula System for Cerenkov Linelike Radiation in Optical Wave Band

Jul 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005apj...627..177c&link_type=abstract

The Astrophysical Journal, Volume 627, Issue 1, pp. 177-185.

Astronomy and Astrophysics

Astronomy

7

Galaxies: Nuclei, Line: Formation, Radiation Mechanisms: Nonthermal, Ultraviolet: General

Scientific paper

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 Cerenkov effect will produce peculiar atomic or ionic emission lines, which we call the ``Cerenkov linelike radiation.'' 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 Cerenkov 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 Cerenkov line radiation. We point out that the Cerenkov 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 Cerenkov 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 Cerenkov line mechanism has to be taken into account.

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