tokens: We acknowledge Bruce Elmegreen for useful discussions. We thank the referee for helping us to polish the results section. S.C. and H.S. acknowledge support from the Academy of Finland. J.H.K. acknowledges financial support from the European Union’s Horizon 2020 research and innovation programme under Marie Skłodowska-Curie grant agreement No. 721463 to the SUNDIAL ITN network, and from the Spanish Ministry of Economy and Competitiveness (MINECO) under grant number AYA2016-76219-P. We acknowledge the usage of the HyperLeda database ( http://leda.univ-lyon1.fr ). 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.
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