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We study the shape of eight dynamically relaxed galaxy clusters observed withthe Hubble Space Telescope and Chandra X-Ray Observatory. Using strong and weakgravitational lensing, the shape of the Brightest Cluster Galaxy and the X-rayisophote we study the ellipticity of the cluster halo at four different radii.We find that the proxies probing the inner regions of the cluster are stronglycoupled with the BCG shape correlated with both the shape predicted by stronggravitational lensing and the X-ray isophote. Conversely we find no suchcorrelation between the shape as predicted by the weak lensing and the otherthree probes suggesting any coupling between the inner and outer regions isweak. We also present in this paper the public release of the HST weak lensingshape measurement code pyRRG, directly available from PyPi(https://pypi.org/project/pyRRG/). This python3.7 code, based on Rhodes et al.(2000) adopts an automated star-galaxy classifier based on a Random Forest andoutputs scientifically useful products such as weak lensing catalogues suitablefor the mass mapping algorithm Lenstool.

The shape of relaxed galaxy clusters and the public release of a HST shape measurement code, pyRRG