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Wind-type outflows in Seyfert 1 active nuclei
P. Pietrini and
Received 8 December 1999 / Accepted 16 August 2000
A sub-relativistic, thermal wind-type flow could represent the physical connection between the central engine and other observed components of the central region, such as the Broad Line Region (BLR) and X-ray/UV absorbers.
Observational clues as to the existence of such outflows in radio-quiet Active Galactic Nuclei (AGNs) are provided, for instance, by blue shifted absorption lines in Seyferts and Broad Absorption Line Quasi Stellar Objects (BAL QSOs).
We study a model for wind-type flows in Seyfert 1s and explore the physical conditions of the outflowing gas, taking into account explicitly both heating and cooling processes, including Compton interaction with radiation. A distributed heating source along the wind way turns out to be necessary for this nuclear wind existence and restrictions on physical parameters to obtain a reasonable wind model in the AGN context are identified; we also allow for externally originated mass loading of the wind.
Key words: hydrodynamics plasmas radiation mechanisms: thermal galaxies: active galaxies: Seyfert
© European Southern Observatory (ESO) 2000
Online publication: December 11, 2000