Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989acasn..30..236c&link_type=abstract
(Acta Astronomica Sinica, vol. 30, no. 3, 1989, p. 236-240) Chinese Astronomy and Astrophysics (ISSN 0275-1062), vol. 14, March
Astronomy and Astrophysics
Astrophysics
H Alpha Line, Lyman Spectra, Stellar Spectra, Stellar Temperature, Ultraviolet Spectra, Cerenkov Radiation, H Beta Line, Iue, Radiant Flux Density, Red Shift
Scientific paper
IUE UV monitoring data of 3C 273 were used to measure the Ly-alpha line intensity f(Ly-alpha), the 'Cerenkov redshift' was estimated, and the particle population in the second energy level, R2 was determined. Together with the observed line intensity ratios H-alpha/H-beta and Ly-alpha/H-beta, the temperature of the HI zone was then found in the broad line cloudlets to be T = 12,000, 9100, 8600 K at three different epochs. These T values are clearly correlated with the values of the UV spectral index alpha-UV and the latter vary monotonically with f(Ly-alpha), in agreement with expectations from the Cerenkov line emission model of the broad line region of quasars.
Cheng Fu-Hua
Yan Ming
You Jun-Han
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