Proper motions and temporal flux changes of compact features in Cassiopeia A at 5 GHz

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Abstract
High-resolution maps of Cas A at 5 GHz made in 1969 and 1974 are compared to investigate changes in the flux densities and positions of compact features. Compact peaks have changed in flux density. Motions of 34 peaks are measured and they are found to have velocities away from the centre which are slower than those of the fast optical knots by more than a factor of 3; their velocities are not well-ordered in magnitude or direction. The compact radio peaks have internal pressures which are higher than those expected in the expanding shell. The most compact radio peak was not detected in 1969 and is coincident with an optical knot.

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