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• W2808984345 abstract "Active galactic nucleus (AGN) feedback, driven by radiation pressure on dust, is an important mechanism for efficiently coupling the accreting black hole to the surrounding environment. Recent observations confirm that X-ray selected AGN samples respect the effective Eddington limit for dusty gas in the plane defined by the observed column density versus the Eddington ratio, the so-called $N_{rm H} - lambda$ plane. A `forbidden' region occurs in this plane, where obscuring clouds cannot be long-lived, due to the action of radiation pressure on dust. Here we compute the effective Eddington limit by explicitly taking into account the trapping of reprocessed radiation (which has been neglected in previous works), and investigate its impact on the $N_{rm H} - lambda$ plane. We show that the inclusion of radiation trapping leads to an enhanced forbidden region, such that even Compton-thick material can potentially be disrupted by sub-Eddington luminosities. We compare our model results to the most complete sample of local AGNs with measured X-ray properties, and find good agreement. Considering the anisotropic emission from the accretion disc, we also expect the development of dusty outflows along the polar axis, which may naturally account for the polar dust emission recently detected in several AGNs from mid-infrared observations. Radiative feedback thus appears to be the key mechanism regulating the obscuration properties of AGNs, and we discuss its physical implications in the context of co-evolution scenarios." @default.
• W2808984345 created "2018-06-29" @default.
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• W2808984345 date "2018-06-19" @default.
• W2808984345 modified "2023-09-30" @default.
• W2808984345 title "Revisiting the ‘forbidden’ region: AGN radiative feedback with radiation trapping" @default.
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• W2808984345 doi "https://doi.org/10.1093/mnras/sty1620" @default.
• W2808984345 hasPublicationYear "2018" @default.
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