The Absorption-Line Systems of Quasars
Three years after the discovery of quasars (1963) the presence of narrow absorption lines in the spectrum of one of them, 3C 191 (with a redshift z e = 1.955) was observed for the first time. It is remarkable that 9 clearly significant lines associated with the same redshift z a = 1.9470 could be unambiguously identified. In Figure 10.1 the spectrum of another quasar, 1209+107, obtained with a photon-counting detector, is shown: in addition to the 3 emission lines (Lyα, N Vλ1240, and Si IVλ1393), 19 absorption lines were detected.
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