tokens: We thank Christine Wilson for making the Caltech Millimeter Array CO map available to us. We also thank the referee for valuable and supportive comments that have significantly helped us to improve the first submitted version of this paper. AMI acknowledges support from the Spanish MINECO through project AYA2015-68217-P. PMW received support through BMBF Verbundforschung (projects MUSE-AO, grant 05A14BAC, and MUSE-NFM, grant 05A17BAA). Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programmes 095.B-0042, 096.B-0017, and 097.B-0346. This research has made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This paper uses the plotting package jmaplot developed by Jesús Maíz-Apellániz 7 . We are also grateful to the communities who developed the many python packages used in this research, such MPDAF ( Piqueras et al. 2017 ), Astropy ( Astropy Collaboration et al. 2013 ), numpy ( Walt et al. 2011 ), scipy ( Jones et al. 2001 ) and matplotlib ( Hunter 2007 ).
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