Question: A cloud of mean number density nH - source with luminosity at 13.6 eV of L13.6eV = 2.18 x 1039 erg s-1 at the

A cloud of mean number density nH - source with luminosity at

A cloud of mean number density nH - source with luminosity at 13.6 eV of L13.6eV = 2.18 x 1039 erg s-1 at the centre. 3000 cm-3 and radius 3 pc has an ionising (a) What is the size of the HII region in pc? [ap = 2 x 10-13 cms-1]. %3D (b) What assumptions are involved in part a) (c) Discuss why the HII region will drive a shock into the rest of the cloud, and calculate the post-shock density.

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