Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990ap%26ss.165...27v&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 165, no. 1, March 1990, p. 27-40.
Astronomy and Astrophysics
Astrophysics
11
Absorption Spectra, Astronomical Models, Photoionization, Quasars, Abundance, Hydrogen Ions, Lyman Alpha Radiation, Plasma Temperature, Rarefied Gases
Scientific paper
A new sufficiently compact code, LINESPEC, is described which is designed to determine the kinetic (collisional + photo) ionization equilibrium in a slab of a hot (T above 10,000 K) rarefied gas, and to simulate synthetic absorption-line spectra formed due to passing continuous radiation (from a quasar) through the slab. Eighty-six resonant absorption lines of ions and atoms of H, He, C, N, O, Ne, Mg, Al, Si, S, Ca, Fe are included with wavelengths in the wavelength range 912 to 5000 A. The behavior and observability of various lines are analyzed as a function of intensity of the ionizing radiation and kinetic plasma temperature. For the purely collisional ionization, the spectrum contains various combinations of absorption lines of hydrogen and/or of atoms and ions of other elements, the relative intensities of the lines being strongly temperature-dependent.
Iakovlev D. G.
Verner Dmitri A.
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