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Physical constraints on the sizes of dense clouds in the central magnetospheres of active galactic nuclei
<span title="1996-12-11">1996</span>
<i title="Oxford University Press (OUP)">
<a target="_blank" rel="noopener" href="https://fatcat.wiki/container/qjdxzupqgjennounydm4zfdlem" style="color: black;">Monthly notices of the Royal Astronomical Society</a>
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<span title="1996-08-16">1996</span>
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<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/astro-ph/9608104v1">arXiv:astro-ph/9608104v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/43nexqa5sfaavn6s4pbjuqlmxa">fatcat:43nexqa5sfaavn6s4pbjuqlmxa</a> </span>
<span class="external-identifiers"> <a target="_blank" rel="external noopener" href="https://arxiv.org/abs/astro-ph/9608104v1">arXiv:astro-ph/9608104v1</a> <a target="_blank" rel="external noopener" href="https://fatcat.wiki/release/43nexqa5sfaavn6s4pbjuqlmxa">fatcat:43nexqa5sfaavn6s4pbjuqlmxa</a> </span>
The range of microphysical and global dynamical timescales in the central regions of Active Galactic Nuclei (AGN) is sufficiently wide to permit the existence of multiphase structure. In particular, very dense, cool clouds can coexist with a hot, magnetically-dominated medium and can thereby efficiently reprocess the continuum radiation generated in this primary source region. The strong dynamical forces in this central magnetosphere can give rise to extremely small clouds. Microphysical
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<a target="_blank" rel="external noopener noreferrer" href="https://doi.org/10.1093/mnras/283.4.1322">doi:10.1093/mnras/283.4.1322</a>
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... es then determine whether such clouds can indeed survive, in spite of their extremely contrasting properties relative to the surrounding environment, for long enough to produce potentially observable thermal reprocessing signatures. We examine specific physical constraints on the thicknesses of such reprocessing clouds. Our results are plotted to show the range of conditions that is representative of the central regions of AGN. We find a parameter subspace in the extreme high density regime for which the effects of microphysical diffusion processes can be overcome and for which cool gas can maintain pressure equilibrium with the ambient magnetosphere.
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