Thursday, November 10, 2011

1111.2103 (A. Dorodnitsyn et al.)

AGN obscuration through dusty infrared dominated flows. II. Multidimensional, radiation-hydrodynamics modeling    [PDF]

A. Dorodnitsyn, T. Kallman, G. S. Bisnovatyi-Kogan
We explore a detailed model in which the active galactic nucleus (AGN) obscuration results from the extinction of AGN radiation in a global flow driven by the pressure of infrared radiation on dust grains. We assume that external illumination by UV and soft X-rays of the dusty gas located at approximately 1pc away from the supermassive black hole is followed by a conversion of such radiation into IR. Using 2.5D, time-dependent radiation hydrodynamics simulations in a flux-limited diffusion approximation we find that the external illumination can support a geometrically thick obscuration via outflows driven by infrared radiation pressure in AGN with luminosities greater than $0.05\, L_{\rm edd}$ and Compton optical depth, $\tau_{\rm T}\gtrsim 1$.
View original: http://arxiv.org/abs/1111.2103

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