We analyze the mass content of the massive strong-lensing cluster Abell 586 ( z = 0.17 ) .
We use optical data ( imaging and spectroscopy ) obtained with the Gemini Multi-Object Spectrograph ( GMOS ) mounted on the 8-m Gemini-North telescope , together with publicly available X-ray data taken with the Chandra space telescope .
Employing different techniques – velocity distribution of galaxies , weak gravitational lensing , and X-ray spatially resolved spectroscopy – we derive mass and velocity dispersion estimates from each of them .
All estimates agree well with each other , within a 68 % confidence level , indicating a velocity dispersion of 1000 – 1250 km s ^ { -1 } .
The projected mass distributions obtained through weak-lensing and X-ray emission are strikingly similar , having nearly circular geometry .
We suggest that Abell 586 is probably a truly relaxed cluster , whose last major merger occurred more than \sim 4 Gyr ago .