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- W2039449237 abstract "Although soft X-ray absorption features in AGNs were discovered almost ten years ago, the nature and location of the gas creating them has remained controversial. Guided by the results of recent high-resolution X-ray spectroscopy, we argue that these features are created in a multitemperature wind whose source of matter is photoionized evaporation from the inner edge of the obscuring torus often found surrounding an AGN. Photoionized evaporation in the presence of a copious mass source locks the ratio of ionizing intensity to pressure to a critical value. However, a broad range of temperatures can coexist in equilibrium for this value of the ratio of ionizing intensity to pressure. Consequently, the flow is expected to be strongly inhomogeneous in temperature. The inferred distance of this material from the source of ionizing radiation depends on how much matter exists at the highest obtainable temperature. This distance can be measured by monitoring how ionic column densities respond to changes in the ionizing continuum on timescales of days to years." @default.
- W2039449237 created "2016-06-24" @default.
- W2039449237 creator A5002407766 @default.
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- W2039449237 date "2001-11-10" @default.
- W2039449237 modified "2023-09-29" @default.
- W2039449237 title "Warm Absorbers in Active Galactic Nuclei: A Multitemperature Wind" @default.
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- W2039449237 doi "https://doi.org/10.1086/323442" @default.
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