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tokens: ACKNOWLEDGEMENTS We thank the anonymous referee for useful comments. This work was partially supported by the Italian Space Agency (ASI) through the grant Attivit di Studio per la comunit scientifica di astrofisica delle alte energie e fisica astroparticellare (Accordo Attuativo ASI-INAF n.2017-14-H.0). TAD acknowledges support from a Science and Technology Facilities Council UK Ernest Rutherford Fellowship. IP acknowledges support from INAF under the PRIN SKA project FORECaST. This paper made use of the following ALMA data: ADS/JAO.ALMA#[2015.1.01572.S] and ADS/JAO.ALMA#[2015.1.00878.7]. ALMA is a partnership of ESO (representing its member states), NSF (USA), and NINS (Japan), together with NRC (Canada), NSC and ASIAA (Taiwan), and KASI (Republic of Korea), in cooperation with the Republic of Chile. The Joint ALMA Observatory is operated by ESO, AUI/NRAO, and NAOJ. The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This paper has also made use of the NASA/IPAC Extragalactic Database, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with NASA. This research used the facilities of the Canadian Astronomy Data Centre operated by the National Research Council of Canada with the support of the Canadian Space Agency.