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We present first results from Multi Unit Spectroscopic Explorer (MUSE)observations at the Very Large Telescope in the MUSE Ultra Deep Field (MUDF), a$\approx 1.2\times 1.4$ arcmin$^2$ region for which we are collecting$\approx$200 hours of integral field spectroscopy. The $\approx 40$-hourobservation completed to date reveals the presence of a group of threeLy$\alpha$ nebulae associated with a bright quasar pair at $z\simeq3.23$ withprojected separation of $\approx 500\rm~kpc$. Two of the nebulae are physicallyassociated with the quasars which are likely powering the Ly$\alpha$ emission,and extend for $\gtrsim 100~\rm kpc$ at a surface brightness level of $\approx6\times 10^{-19}~\rm erg~s^{-1}~cm^{-2}~arcsec^{-2}$. A third smaller($\approx$35 kpc) nebula lies at a velocity offset of $\approx 1550$ kms$^{-1}$. Despite their clustered nature, the two large nebulae have propertiessimilar to those observed in isolated quasars and exhibit no sharp decline influx at the current depth, suggesting an even more extended distribution of gasaround the quasars. We interpret the shape and the alignment of the twobrighter nebulae as suggestive of the presence of an extended structureconnecting the two quasar host galaxies, as seen for massive galaxies formingwithin gas-rich filaments in cosmological simulations.

The MUSE Ultra Deep Field (MUDF). I. Discovery of a group of Ly$\alpha$ nebulae associated with a bright $z\approx 3.23$ quasar pair