Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989scsmp..32..971c&link_type=abstract
Science in China, Series A - Mathematics, Physics, Astronomy and Technological Sciences (ISSN 0253-5831), vol. 32, Aug. 1989, p.
Astronomy and Astrophysics
Astronomy
Active Galactic Nuclei, Balmer Series, Interstellar Extinction, Quasars, Radio Astronomy, Seyfert Galaxies, Astronomical Models, Cerenkov Radiation, Extragalactic Radio Sources, Radio Spectra, Red Shift
Scientific paper
The observed intensity ratios of the Balmer lines for low redshift quasars and Seyfert I galaxies are compiled. In the framework of the Cerenkov line emission theory, the theoretical intensity ratios is compared with those of observations, and find that the observed intensity ratios for the radio-loud quasars and the Seyfert I galaxies are nearer to the theoretical expectation than those for the radio-quiet sources. It seems that for the radio-loud AGNs, the characteristics of the Cerenkov line emission are more remarkable because of the existence of a great number of relativistic electrons. The reddening by dust in quasars and the Seyfert galaxies are discussed. The fact that the reddening of the Seyfert galaxies is more serious than quasars shows that the Seyfert galaxies have more dust than quasars. This is in agreement with the present point of view.
Cheng Fu-Hua
Cheng Fu-zhen
Luo Shan
You Jun-Han
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