%0 Generic %1 Keating2012 %A Keating, S. K. %A Everett, J. E. %A Gallagher, S. C. %A Deo, R. P. %D 2012 %K DustyTorus SED modelling %T Sweeping Away the Mysteries of Dusty Continuous Winds in AGN %U http://arxiv.org/abs/1202.4681 %X An integral part of the Unified Model for Active Galactic Nuclei (AGNs) is an axisymmetric obscuring medium, which is commonly depicted as a torus of gas and dust surrounding the central engine. However, a robust, dynamical model of the torus is required in order to understand the fundamental physics of AGNs and interpret their observational signatures. Here we explore self-similar, dusty disk-winds, driven by both magnetocentrifugal forces and radiation pressure, as an explanation for the torus. Using these models, we make predictions of AGN infrared (IR) spectral energy distributions (SEDs) from 2-100 microns by varying parameters such as: the viewing angle; the base column density of the wind; the Eddington ratio; the black hole mass; and the amount of power in the input spectrum emitted in the X-ray relative to that emitted in the UV/optical. We find that models with N_H,0 = 10^25 cm^-2, L/L_Edd = 0.1, and M_BH >= 10^8 Msun are able to adequately approximate the general shape and amount of power expected in the IR as observed in a composite of optically luminous Sloan Digital Sky Survey (SDSS) quasars. The effect of varying the relative power coming out in X-rays relative to the UV is a change in the emission below ~5 micron from the hottest dust grains; this arises from the differing contributions to heating and acceleration of UV and X-ray photons. We see mass outflows ranging from ~1-4 Msun/yr, terminal velocities ranging from ~1900-8000 km/s, and kinetic luminosities ranging from ~1x10^42-8x10^43 erg/s. Further development of this model holds promise for using specific features of observed IR spectra in AGNs to infer fundamental physical parameters of the systems.

@misc{Keating2012, abstract = { An integral part of the Unified Model for Active Galactic Nuclei (AGNs) is an axisymmetric obscuring medium, which is commonly depicted as a torus of gas and dust surrounding the central engine. However, a robust, dynamical model of the torus is required in order to understand the fundamental physics of AGNs and interpret their observational signatures. Here we explore self-similar, dusty disk-winds, driven by both magnetocentrifugal forces and radiation pressure, as an explanation for the torus. Using these models, we make predictions of AGN infrared (IR) spectral energy distributions (SEDs) from 2-100 microns by varying parameters such as: the viewing angle; the base column density of the wind; the Eddington ratio; the black hole mass; and the amount of power in the input spectrum emitted in the X-ray relative to that emitted in the UV/optical. We find that models with N_H,0 = 10^25 cm^-2, L/L_Edd = 0.1, and M_BH >= 10^8 Msun are able to adequately approximate the general shape and amount of power expected in the IR as observed in a composite of optically luminous Sloan Digital Sky Survey (SDSS) quasars. The effect of varying the relative power coming out in X-rays relative to the UV is a change in the emission below ~5 micron from the hottest dust grains; this arises from the differing contributions to heating and acceleration of UV and X-ray photons. We see mass outflows ranging from ~1-4 Msun/yr, terminal velocities ranging from ~1900-8000 km/s, and kinetic luminosities ranging from ~1x10^42-8x10^43 erg/s. Further development of this model holds promise for using specific features of observed IR spectra in AGNs to infer fundamental physical parameters of the systems. }, added-at = {2012-02-23T09:15:38.000+0100}, author = {Keating, S. K. and Everett, J. E. and Gallagher, S. C. and Deo, R. P.}, biburl = {https://www.bibsonomy.org/bibtex/2c6c31d117b5bc13427dbff281e6c9a80/sunsetred4}, description = {[1202.4681] Sweeping Away the Mysteries of Dusty Continuous Winds in AGN}, interhash = {3d27de447717cb19bf9c29ccbb4e00db}, intrahash = {c6c31d117b5bc13427dbff281e6c9a80}, keywords = {DustyTorus SED modelling}, note = {cite arxiv:1202.4681Comment: 29 pages, 14 figures, accepted for publication in the Astrophysical Journal}, timestamp = {2012-02-23T09:15:38.000+0100}, title = {Sweeping Away the Mysteries of Dusty Continuous Winds in AGN}, url = {http://arxiv.org/abs/1202.4681}, year = 2012 }