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In the hierarchical model of structure formation, giant elliptical galaxiesform through merging processes within the highest density peaks known asprotoclusters. While high-redshift radio galaxies usually pinpoint the locationof these environments, we have recently discovered at z~2-3 three Enormous(>200 kpc) Lyman-Alpha Nebulae (ELANe) that host multiple AGN and that aresurrounded by overdensities of Lyman-alpha Emitters (LAE). These regions areprime candidates of massive protoclusters in the early stages of assembly. Tocharacterize the star-forming activity within these rare structures - both onELAN and protocluster scales - we have initiated an observational campaign withthe JCMT and the APEX telescopes. In this paper we report on sensitiveSCUBA-2/JCMT 850 and 450 $\mu$m observations of a 128 arcmin$^2$ fieldcomprising the ELAN MAMMOTH-1, together with the peak of the hosting BOSS1441LAE overdensity at z=2.32. These observations unveil $4.0\pm1.3$ times highersource counts at 850 $\mu$m with respect to blank fields, likely confirming thepresence of an overdensity also in obscured tracers. We find a strong detectionat 850 $\mu$m associated with the continuum source embedded within the ELANMAMMOTH-1, which - together with the available data from the literature - allowus to constrain the spectral energy distribution of this source to be of anULIRG with a far-infrared luminosity of $L_{\rm FIR}^{\rmSF}=2.4^{+7.4}_{-2.1}\times10^{12}$ L$_{\odot}$, and hosting an obscured AGN.Such a source is thus able to power the hard photoionization plus outflowscenario depicted in Cai et al. (2017b) to explain the extended Lyman-alpha,HeII$\lambda1640$ and CIV$\lambda1549$ emission, and their kinematics. Inaddition, the two brightest detections at 850 $\mu$m ($f_{850}>18$ mJy) sit atthe density peak of the LAEs overdensity, likely pinpointing the core of theprotocluster.

Overdensity of submillimeter galaxies around the $z\simeq 2.3$ MAMMOTH-1 nebula