Non-LTE effects on the strength of the Lyman edge in quasar accretion disks

Details Non-LTE effects on the strength of the Lyman edge in quasar accretion disks Non-LTE effects on the strength of the Lyman edge in quasar accretion disks

Dec 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...437l..91s&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 437, no. 2, p. L91-L94

Computer Science

Numerical Analysis

16

Accretion Disks, Active Galactic Nuclei, Galactic Structure, Local Thermodynamic Equilibrium, Numerical Analysis, Quasars, Ultraviolet Astronomy, Abundance, Lyman Spectra, Radiative Transfer

Scientific paper

We have calculated UV/EUV (300 A which is less than or equal to lambda which is less than or equal to 1500 A) continuous energy distributions of accretion disks in the centers of active galactic nuclei (AGNs) for disk luminosities in the range 0.1 LEdd less than or equal to Lacc less than 1.0 LEdd and central masses ranging from 108 solar mass to 109 solar mass. The vertical gas pressure structure of the disk and the disk height are obtained analytically; the temperature stratification and the resulting continuum radiation fields are calculated numerically. We have included non-Local Thermodynamic Equilibrium (LTE) effects of both the ionization equilibrium and the level populations of hydrogen and helium. We show that these non-LTE effects reduce the strength of the Lyman edge when comapred to the LTE case. In non-LTE we find that the edge can be weakly in emission or absorption for disks seen face-on, depending on the disk parameters.

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