The Dust-to-Gas Ratio and the Role of Radiation Pressure in Luminous, Obscured Quasars

Abstract

The absence of high Eddington ratio, obscured Active Galactic Nuclei (AGN) in local ($z\lesssim 0.1$) samples of moderate luminosity AGN has generally been explained to result from radiation pressure on the dusty gas governing the level of nuclear ($\lesssim 10$pc) obscuration. However, very high accretion rates are routinely reported among obscured quasars at higher luminosities, and may require a different feedback mechanism. We compile constraints on obscuration and Eddington ratio for samples of X-ray, optical, infrared, and submm selected AGN at quasar luminosities. Whereas moderate luminosity, obscured AGN in the local universe have a range of lower Eddington ratios ($f_{\mathrm{Edd}}\sim 0.001-0.1$), the most luminous ($L_{\mathrm{bol}}\gtrsim 10^{46}$erg s${}^{-1}$) IR/submm-bright, obscured quasars out to $z\sim 3$ commonly have very high Eddington ratios ($f_{\mathrm{Edd}}\sim 0.1-1$). This apparent lack of radiation pressure feedback in luminous obscured quasars is likely coupled with AGN timescales, such that a higher fraction of luminous obscured quasars are seen due to the short timescale for which quasars are most luminous. Adopting quasar evolutionary scenarios, extended ($\sim 10^{2-3}$pc) obscuration may work together with the shorter timescales to explain the observed fraction of obscured, luminous quasars, while outflows driven by radiation pressure will slowly clear this material over the AGN lifetime.

arXiv comment15 pages, 6 figures, accepted to ApJ, typos corrected

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