Abstract
Recent observations show that some QSO absorption line systems, especially the MgII systems, are associated with very large galactic haloes. We propose that these absorbers are clouds confined by the pressure of ambient hot gas in galactic haloes. Such a model is based on the generally accepted picture that galaxies form from the cooling and condensation of gas in dark haloes. We determine the properties of this hot gas and of the absorption systems on the basis of observational and theoretical constraints. We show that a consistent model can be obtained in such a picture. Due to the drag force of the hot medium, clouds may move at a velocity that is lower than the circular velocity of the halo.
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