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- W2299263429 abstract "The absence of intrinsic broad-line emission has been reported in a number of active galactic nuclei (AGN), including some with high Eddington ratios. Such ‘true type 2 AGN’ are inherent to the disc-wind scenario for the broad-line region: broad-line emission requires a minimal column density, implying a minimal outflow rate and thus a minimal accretion rate. Here we perform a detailed analysis of the consequences of mass conservation in the process of accretion through a central disc. The resulting constraints on luminosity are consistent with all the cases where claimed detections of true type 2 AGN pass stringent criteria, and predict that intrinsic broad-line emission can disappear at luminosities as high as ∼4 × 1046 erg s−1 and any Eddington ratio, though more detections can be expected at Eddington ratios below ∼1 per cent. Our results are applicable to every disc outflow model, whatever its details and whether clumpy or smooth, irrespective of the wind structure and its underlying dynamics. While other factors, such as changes in spectral energy distribution or covering factor, can affect the intensities of broad emission lines, within this scenario they can only produce true type 2 AGN of higher luminosity then those prescribed by mass conservation." @default.
- W2299263429 created "2016-06-24" @default.
- W2299263429 creator A5024808908 @default.
- W2299263429 creator A5086132801 @default.
- W2299263429 date "2016-03-18" @default.
- W2299263429 modified "2023-09-23" @default.
- W2299263429 title "Disc outflows and high-luminosity true type 2 AGN" @default.
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- W2299263429 doi "https://doi.org/10.1093/mnras/stw657" @default.
- W2299263429 hasPublicationYear "2016" @default.
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