tokens: ACKNOWLEDGEMENTS We thank Javier Román and Raúl Infante for providing the extended SDSS r -band PSF, and Sebastién Comerón for a number of useful suggestions. We acknowledge support from the Spanish Ministry of Economy and Competitiveness (MINECO) under grant numbers AYA2013-41243-P, AYA2016-76219-P and AYA2016-77237-C3-1-P. J.H.K. and I.T.C. acknowledge 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 Fundación BBVA under its 2017 programme of assistance to scientific research groups, for the project ‘Using machine-learning techniques to drag galaxies from the noise in deep imaging’. J.H.K. thanks the Leverhulme Foundation for the award of a Visiting Professorship at Liverpool John Moores University. Funding for SDSS-III has been provided by the Alfred P. Sloan Foundation, the Participating Institutions, the National Science Foundation, and the U.S. Department of Energy Office of Science. SDSS-III is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS-III Collaboration including the University of Arizona, the Brazilian Participation Group, Brookhaven National Laboratory, University of Cambridge, Carnegie Mellon University, University of Florida, the French Participation Group, the German Participation Group, Harvard University, the Instituto de Astrofisica de Canarias, the Michigan State/Notre Dame/JINA Participation Group, Johns Hopkins University, Lawrence Berkeley National Laboratory, Max Planck Institute for Astrophysics, New Mexico State University, New York University, Ohio State University, Pennsylvania State University, University of Portsmouth, Princeton University, the Spanish Participation Group, University of Tokyo, University of Utah, Vanderbilt University, University of Virginia, University of Washington, and Yale University. This work is based on archival data from the Spitzer Space Telescope available in the NASA/ IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Some of the data presented in this paper were obtained from the Mikulski Archive for Space Telescopes (MAST). STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. Support for MAST for non- HST data is provided by the NASA Office of Space Science via grant NNX09AF08G and by other grants and contracts.This research has made use of different Python packages and of NASA’s Astrophysics Data (NED) System Bibliographic Services, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautic and Space Administration. We acknowledge constructive remarks by an anonymous referee.
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