Dynamics of ten clusters of galaxies with substructures
  We present a detailed Chandra study of a sample of ten clusters of galaxies
selected based on the presence of substructures in their optical images. The
X-ray surface brightness maps of most of these clusters show anisotropic
morphologies, especially in the central regions. A total of 22 well resolved
significantly bright X-ray peaks (corresponding with high-density regions) are
seen in the central parts (within r$_{\rm c}/2$) of the clusters. Multiple
peaks are seen in central parts of six clusters. Eleven peaks are found to have
optical counterparts (10 coinciding with the BCGs of the 10 clusters and one
coinciding with the second brightest galaxy in A539). For most of the clusters,
the optical substructures detected in the previous studies are found to be
outside the field of view of Chandra. In the spectroscopically produced 2-D
temperature maps, significantly lower temperatures are seen at the location of
three peaks (two in A539 and one in A376). The centres of five clusters in our
sample also host regions of higher temperature compared to the ambient medium,
indicating the presence of galaxy scale mergers. The X-ray luminosity, gas mass
and central cooling time estimates for all the clusters are presented. The
radial X-ray surface-brightness profiles of all but one of the clusters are
found to be best-fitted with a double-$\beta$ model, pointing towards the
presence of double-phased central gas due to cool-cores. The cooling time
estimates of all the clusters, however, indicate that none of them hosts a
strong cool-core, although the possibility of weak cool-cores cannot be ruled
out.
