Molecular Bubble in Cepheus A

(a): A high resolution image of the molecular shells to the west of the core of Cepheus A taken with the CFHT. The H_2 breaks up into a number of unresolved clumps within each shell. Seeing in these images is 0.6". (b): Same as (a) but with a narrow band continuum image subtracted. (c): Same as (b) but with the image displayed to show the frothy bubble outlined by the molecular shells. (d): An expanded view of the shells shown in (b). The bright clumps of H_2 lie along the edges of the shells.