The Absorption-Line Systems of Quasars

  • Françoise Combes
  • Patrick Boissé
  • Alain Mazure
  • Alain Blanchard
Part of the Astronomy and Astrophysics Library book series (AAL)


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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Copyright information

© Springer-Verlag Berlin Heidelberg 1995

Authors and Affiliations

  • Françoise Combes
    • 1
  • Patrick Boissé
    • 2
  • Alain Mazure
    • 3
  • Alain Blanchard
    • 4
  1. 1.Observatoire de ParisDEMIRMParisFrance
  2. 2.Ecole Normale SupérieureParis Cedex 5France
  3. 3.GRAAL, Université de Montpellier IIMontpellier Cedex 5France
  4. 4.Observatoire de StrasbourgStrasbourgFrance

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