New considerations on the broad-line regions of quasars

Details New considerations on the broad-line regions of quasars New considerations on the broad-line regions of quasars

Nov 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...322..174y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 322, Nov. 1, 1987, p. 174-179.

Astronomy and Astrophysics

Astrophysics

6

Astronomical Models, Cerenkov Radiation, Emission Spectra, Quasars, Recombination Reactions, Spectral Line Width, Gas Density, Lyman Alpha Radiation, Optical Thickness

Scientific paper

In the broad-line regions of quasars, there exist three different line emission mechanisms, i.e., the Cerenkov line and conventional line by recombination and collisional excitation. However, the Cerenkov line photon can avoid the resonance absorption because of the 'Cerenkov redshift' and can escape easily from the deep inner part of the gas, i.e., gas appears more 'transparent' for the Cerenkov line than for a conventional line. For an optically thick dense gas, if there are sufficient relativistic electrons, the intensity of the Cerenkov line will be dominating. Taking the quasar 3C 273 as an example, it is shown that only if N(e) is roughly 10 to the 4th to -10 to the 6th/cu cm, the calculated Cerenkov Ly-alpha luminosity is in agreement with observation.

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