tokens: We are extremely grateful to Lyuba Slavcheva-Mihova for providing us with their HST structure map of Mrk 590. Also, we thank Sandra Raimundo for helpful discussions and the anonymous reviewer for insightful comments. We wish to thank the staff of the Nordic and Italian nodes of the European ARC, in particular Ivan Marti-Vidal, for assistance with the data reduction and imaging. We are also indebted to SMA support staff, including Mark Gurwell and Lars Kristensen, for their assistance with the preparation of the SMA proposal, scheduling of observations and data reduction. Travel to the Nordic node of the ARC was made possible through the MARCUs RadioNet3 funding from the European Commission Seventh Framework Programme (FP/2007-2013) under grant agreement no. 283393. JYK is supported by a research grant (VKR023371) from Villumfonden. MV, JYK, and DL gratefully acknowledge support from the Danish Council for Independent Research via grant no. DFF 4002-00275. The Dark Cosmology Centre is funded by the Danish National Research Foundation. The work of VC is partly supported by the Italian Ministero dell′′Istruzione, Università e Ricerca through the grant Progetti Premiali 2012 – iALMA (CUP C52I13000140001). BMP is grateful to the US National Science Foundation for support through grant AST–1008882 to The Ohio State University. This paper makes use of the following ALMA data: ADS/JAO.ALMA#2013.1.00534.S. 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 (NRAO) is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc. This research also makes use of data from the SMA, which is a joint project between the Smithsonian Astrophysical Observatory and the Academia Sinica Institute of Astronomy and Astrophysics and is funded by the Smithsonian Institution and the Academia Sinica. We also used data based on observations made with the NASA/ESA HST , and obtained from the Hubble Legacy Archive, which is a collaboration between the Space Telescope Science Institute (STScI/NASA), the Space Telescope European Coordinating Facility (ST-ECF/ESA) and the Canadian Astronomy Data Centre (CADC/NRC/CSA). The NVAS image used in this paper was produced as part of the NVAS, (c) AUI/NRAO. We acknowledge the use of data from the NASA Extragalactic Database (NED).
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