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We present the first stage of an investigation of the interactions of thejets in the radio galaxy Hydra A with the intracluster medium. We consider thejet kinetic power, the galaxy and cluster atmosphere, and the inner structureof the radio source. Analysing radio observations of the inner lobes of Hydra Aby Taylor et al. (1990) we confirm the jet power estimates of about 1e45 ergs/sderived by Wise et al. (2007) from dynamical analysis of the X-ray cavities.With this result and a model for the galaxy halo, we explore thejet-intracluster medium interactions occurring on a scale of 10 kpc usingtwo-dimensional, axisymmetric, relativistic pure hydrodynamic simulations. Akey feature is that we identify the three bright knots in the northern jet asbiconical reconfinement shocks, which result when an over pressured jet startsto come into equilibrium with the galactic atmosphere. Through an extensiveparameter space study we deduce that the jet velocity is approximately 0.8 c ata distance 0.5 kpc from the black hole. The combined constraints of jet power,the observed jet radius profile along the jet, and the estimated jet pressureand jet velocity imply a value of the jet density parameter approximately 13for the northern jet. We show that for a jet velocity = 0.8c and angle betweenthe jet and the line of sight = 42 deg, an intrinsic asymmetry in theemissivity of the northern and southern jet is required for a consistentbrightness ratio approximately 7 estimated from the 6cm VLA image of Hydra A.

Jet-Intracluster Medium interaction in Hydra A. I Estimates of jet velocity from inner knots