Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-06-09
Astronomy and Astrophysics
Astrophysics
8 pages with 1 color figure; to appear in Science on June 15, 2001; press embargo until 2:00 p.m. on June 14
Scientific paper
10.1126/science.1060412
A blazar is believed to exist in every radio-loud quasar. This is expected in a unified scheme where the differences in both optical and radio observations of radio-loud quasars are the result of different viewing angles. We have predicted that blazars may be detected using emission line ratio variations caused by variable illumination of gas clouds in the broad emission line region. In a spectroscopic search of 62 quasars at a redshift of about 2, we have discovered large (>20%) variations of the emission line ratios, CIV/CIII] or CIV/Ly$\alpha$, when compared with historical data taken over 10 years ago. This result is consistent with our prediction, and thus supports the unification scheme for radio-loud quasars.
Ma Feng
Wills Beverley J.
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