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Both theoretical and observational results suggest that high-redshift radiogalaxies (HzRGs) inhabit overdense regions of the universe and might be theprogenitors of local, massive galaxies residing in the centre of galaxyclusters. In this paper we present CO(3-2) line observations of the HzRG TXS0828+193 (z=2.57) and its environment using the Atacama LargeMillimeter/submillimeter Array. In contrast to previous observations, we detectCO emission associated with the HzRG and derive a molecular gas mass of$(0.9\pm0.3)\times10^{10}\,\rm M_{\odot}$. Moreover, we confirm the presence ofa previously detected off-source CO emitting region (companion #1), and detectthree new potential companions. The molecular gas mass of each companion iscomparable to that of the HzRG. Companion #1 is aligned with the axis of theradio jet and has stellar emission detected by Spitzer. Thus this source mightbe a normal star-forming galaxy or alternatively a result of jet-induced starformation. The newly found CO sources do not have counterparts in any otherobserving band and could be high-density clouds in the halo of TXS 0828+193 andthus potentially linked to the large-scale filamentary structure of the cosmicweb.

ALMA detects molecular gas in the halo of the powerful radio galaxy TXS 0828+193