  We describe a wavelet transform analysis of the ROSAT PSPC images of the Coma
cluster. On small scales, ~< 1', the wavelet analysis shows substructure
dominated by two extended sources surrounding the two brightest cluster
galaxies NGC 4874 and NGC 4889. On slightly larger scales, ~2', the wavelet
analysis reveals a filament of X-ray emission originating near the cluster
center, curving to the south and east for ~25' in the direction of the galaxy
NGC 4911, and ending near the galaxy NGC 4921. These results extend earlier
ROSAT observations and further indicate the complex nature of the cluster core.
We consider two possible explanations for the production of the filamentary
feature as arising from interactions of the main cluster with a merging group.
The feature could arise from either ram pressure stripped gas or a dark matter
perturbation of tidally stripped material.

Astrophysics