There is an ongoing debate as to whether ultra-diffuse galaxies are regular dwarf galaxies with low star formation or massive ‘failed’ objects that quenched their star formation in the early Universe. Current evidence seems to support the former scenario.
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Acknowledgements
I thank N. Chamba, P. Mancera-Piña, M. Montes, J. Román and T. Saifollahi for helpful comments. This work was supported by grant PID2019-107427GB-C32 from The Spanish Ministry of Science and Innovation. I acknowledge financial support from the European Union’s Horizon 2020 research and innovation programme under Marie Sklodowska-Curie grant agreement No. 721463 to the SUNDIAL ITN network, and the European Regional Development Fund (FEDER), from IAC project P/300624, financed by the Ministry of Science, Innovation and Universities, through the State Budget and by the Canary Islands Department of Economy, Knowledge and Employment, through the Regional Budget of the Autonomous Community.
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Trujillo, I. Ultra-diffuse galaxies at the crossroads. Nat Astron 5, 1182–1184 (2021). https://doi.org/10.1038/s41550-021-01388-y
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DOI: https://doi.org/10.1038/s41550-021-01388-y
