Abstract
The inferred high temperature and small size of the broadline emitting clouds in quasars and Seyfert galaxies requires some confining mechanism to prevent rapid dissipation of those clouds in a time much shorter than their dynamical time scale. Ram pressure confinement by a supersonic wind provides such confinement while avoiding the mass budget and dynamical drag problems of a static confining medium. Reasonable limits on the mass outflow in the wind restricts the size of the high density BLR (broad-line region) to the canonical 1 pc. The limited range in observed ionization parameter also follows given that the mass accretion rate is similar to the mass outflow rate. Flat spectrum (L ~ 0.5) radio emission from the BLR is also expected to be produced in the bow shocks around the confined clouds.
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Carroll, T.J. (1986). Ram Pressure Confinement of the Emission Line Gas and the Associated Radio Emission in AGN’s. In: Giuricin, G., Mardirossian, F., Mezzetti, M., Ramella, M. (eds) Structure and Evolution of Active Galactic Nuclei. Astrophysics and Space Science Library, vol 121. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-4562-3_37
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DOI: https://doi.org/10.1007/978-94-009-4562-3_37
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