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We present ALMA observations on and around the radio-quiet quasar UM287 at$z=2.28$. Together with a companion quasar, UM287 is believed to play a majorrole in powering the surrounding enormous Ly$\alpha$ nebula (ELAN), dubbed theSlug ELAN, that has an end-to-end size of 450 physical kpc. In addition to thequasars, we detect a new dusty star-forming galaxy (DSFG), dubbed theSlug-DSFG, in 2 mm continuum with a single emission line consistent withCO(4-3). The Slug-DSFG sits at a projected distance of 100 kpc south-east fromUM287, with a systemic velocity difference of $-360\pm30$ km s$^{-1}$ withrespect to UM287, suggesting it being a possible contributor to the powering ofthe Slug ELAN. With careful modeling of SED and dynamical analyses it is foundthat the Slug-DSFG and UM287 appear low in both gas fraction and gas-to-dustratio, suggesting environmental effects due to the host massive halo. Inaddition, our Keck long-slit spectra reveal significant Ly$\alpha$ emissionsfrom the Slug-DSFG, as well as a Ly$\alpha$ tail that starts at the locationand velocity of the Slug-DSFG and extends towards the south, with a projectedlength of about 100 kpc. Supported by various analytical estimates we proposethat the Ly$\alpha$ tail is a result of the Slug-DSFG experiencing ram pressurestripping. The gas mass stripped is estimated to be about 10$^9$ M$_\odot$,contributing to the dense warm/cool gas reservoir that is believed to helppower the exceptional Ly$\alpha$ luminosity.

astrophysical journal/the astrophysical journal

A Multiwavelength Study of ELAN Environments (AMUSE$^2$): Detection of a  dusty star-forming galaxy within the enormous Lyman $\alpha$ nebula at  $z=2.3$ sheds light on its origin