Astrophysics and Space Science

, Volume 171, Issue 1–2, pp 121–124 | Cite as

Ionization equilibrium and spectrum formation in QSOs' absorption regions

  • D. A. Verner
  • D. G. Yakovlev
Session 4 Active Galaxies and Cosmology


A new and rather compact code LINESPEC is developed to calculate the absorption line spectra formed due to passage of continuous radiation (from a quasar) through a layer of a hot (T≥104 K) and rarefied (N≪1014 cm−3) plasma in the state of steady kinetic (collisional+photo) ionization equilibrium. Illustrative calculations show that the spectra are very sensitive toT and to the ratio of number densities of ionizing photons and particles.


Radiation Absorption Line Absorption Region Line Spectrum Continuous Radiation 
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Copyright information

© Kluwer Academic Publishers 1990

Authors and Affiliations

  • D. A. Verner
    • 1
  • D. G. Yakovlev
    • 1
  1. 1.A.F. Ioffe Institute of Physics and TechnologyLeningradU.S.S.R.

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