Testing The AGN/QSO Accretion Disk Paradigm Using New Non-LTE Models

Computer Science

Scientific paper

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Hst Proposal Id #8748 Agn/Quasars

Scientific paper

We propose to compare a large FOS database of observed quasar spectral energy distributions to new accretion disk models. We have constructed a large grid of non-LTE disk models for a wide range of black hole mass and mass accretion rate, viscosity parameter Alpha, and black hole spins. Our procedure calculates self-consistently the vertical structure of all disk annuli together with the radiation field, without any approximations imposed on the optical thickness of the disk, and without any ad hoc approximations of the radiation intensity. The total spectrum of a disk is computed by summing the spectra of the individual annuli, taking into account the general relativistic transfer function. The results, which include predictions of the polarization spectrum, differ substantially from previous less reliable models. The FOS database has sufficient size, spectral resolution, and S/N to allow us to account statistically for the important effects of intergalactic and interstellar absorption, as well as the range of expected accretion disk viewing angles in various AGN subtypes. Our aim is to make a definitive comparison between observations and accretion disk models.

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