Energy conservation in the thin layer approximation: VI. Bubbles and
  super-bubbles
  We model the conservation of energy in the framework of the thin layer
approximation for two types of interstellar medium (ISM). In particular, we
analyse an ISM in the presence of self-gravity and a Gaussian ISM which
produces an asymmetry in the advancing shell. The astrophysical targets to be
simulated are the Fermi bubbles, the local bubble, and the W4 super-bubble. The
theory of images is applied to a piriform curve, which allows deriving some
analytical formulae for the observed intensity in the case of an optically thin
medium.
