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tokens: Acknowledgements This work is based in part on observations made with the NASA/ESA Hubble Space Telescope , obtained at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. These observations are associated with programs 9744, 12889, 14254. Financial support was provided by NASA through grants from the Space Telescope Science Institute. We are grateful to Vivien Bonvin, Geoff C.-F. Chen, Frederic Courbin, Matthew A. Malkan, Cristian E. Rusu, Jong-Hak Woo and Andreas Schulze for useful comments and suggestions that improved this manuscript. We thank Chien Peng for his help with the estimates of black hole mass. XD is supported by the China Scholarship Council. TT acknowledges support by the Packard Foundations through a Packard Research Fellowship and by the NSF through grants AST-1450141 and AST-1412315. SHS gratefully acknowledges support from the Max Planck Society through the Max Planck Research Group. CER acknowledges support from the NSF grant AST-1312329. DS acknowledges funding support from a Back to Belgium grant from the Belgian Federal Science Policy (BELSPO). KCW and DP are supported by an EACOA Fellowship awarded by the East Asia Core Observatories Association, which consists of the Academia Sinica Institute of Astronomy and Astrophysics, the National Astronomical Observatory of Japan, the National Astronomical Observatories of the Chinese Academy of Sciences, and the Korea Astronomy and Space Science Institute. VNB gratefully acknowledges assistance from a National Science Foundation (NSF) Research at Undergraduate Institutions (RUI) grant AST-1312296. Note that findings and conclusions do not necessarily represent the views of the NSF. VB acknowledges the support of the Swiss National Science Foundation (SNSF).