Theoretical quasar emission line ratios. I  Transfer and escape of radiation. II  Hydrogen Lalpha, Balmer, and Paschen lines, and the Balmer continuum
Abstract
We describe a formalism for the solution of the frequencyintegrated radiative transfer equation and the atomic steady state equation appropriate to an externally irradiated, semiinfinite medium. The source functions are cast into equivalent twolevel forms, and the equations linking the emergent flux, the line center source function, the flux divergence coefficient ρ, and the atomic steady state equations are given. Asymptotic forms for scaling law solutions to the radiative transfer equation are developed. Escape probabilities appropriate to the above scaling law solutions are discussed for subordinate lines, strongly interlocked resonance lines, weakly interlocked resonance lines, and the boundfree continua.
 Publication:

The Astrophysical Journal
 Pub Date:
 January 1981
 DOI:
 10.1086/158605
 Bibcode:
 1981ApJ...243..381C
 Keywords:

 Balmer Series;
 Emission Spectra;
 H Alpha Line;
 Paschen Series;
 Quasars;
 Radiative Transfer;
 Astronomical Models;
 Asymptotic Methods;
 Gas Ionization;
 Line Spectra;
 Lyman Alpha Radiation;
 Scaling Laws;
 Astrophysics