Open AccessTHE CERENKOV LINE RADIATION AND THE EMISSION-LINE SPECTRA OF QSO<sub>s</sub>
Author(s) -
Jinyuan You,
Fuhua Cheng
Publication year - 1980
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.29.927
Subject(s) - physics , spectral line , emission spectrum , line (geometry) , atomic physics , qsos , electron , isotropy , radiation , electron density , astrophysics , optics , quasar , nuclear physics , quantum mechanics , galaxy , geometry , mathematics
Cerenkov effect in gas medium is discussed. It is pointed out that the relativistic electrons with isotropic distribution of velocity, when moving through a dense gas, will produce the broad atomic emission-lines with a remarkably asymmetric profile, the continuum slope on its long wave side being quite flat and that on the short wave side very steep.Calculation for the hydrogen atom shows that the width of Lα line may be larger than 60? as the gas density reaches N = 5×1020cm-3. According to this radiation mec-. hanism, the emission-line spectra of QSOs can be interpreted satisfactorily.