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We present new observations of the lensing cluster SMACSJ2031.8-4036 obtainedwith the MUSE integral field spectrograph as part of its commissioning on theVery Large Telescope. By providing medium-resolution spectroscopy over the full4750-9350 Angstroms domain and a 1x1 arcmin2 field of view, MUSE is ideallysuited for identifying lensed galaxies in the cluster core, in particularmultiple-imaged systems. We perform a redshift analysis of all sources in thedatacube and identify a total of 12 systems ranging from $z=1.46$ to $z=6.4$,with all images of each system confirmed by a spectroscopic redshift. Thisallows us to accurately constrain the cluster mass profile in this region. Weforesee that future MUSE observations of cluster cores should help us discoververy faint Lyman-alpha emitters thanks to the strong magnification and the highsensitivity of this instrument.

MUSE observations of the lensing cluster SMACSJ2031.8-4036: new constraints on the mass distribution in the cluster core