Last year, Pieter van Dokkum et al., Nature volume 555, p 629–632 (29 March 2018), reported absence of DM in a certain galaxy. Since result upsets the DM paradigm, the unexpected discovery received significant amount of BACKLASH, and even the hype the paper received drew some criticism.
Now van Dokkum et al. report the discovery of a second galaxy with little to no dark matter, named NGC1052-DF4. It resides in the same group as DF2, and was discovered by the same instrument that was used to study DF2: the Dragonfly Telephoto Array. If true, the confirmation of a new population of galaxies like DF2 and DF4 could raise many interesting questions about our understanding of how these galaxies form: did a past encounter with another galaxy cause the stellar and the dark matter components to separate? Is tidal stripping by a larger galaxy a possible mechanism for this? Could it have formed without any dark matter in the first place?
https://arxiv.org/abs/1901.05973?fbclid=IwAR0LPPr6NBvuzxVr-B1LMrT6A4vzJberOGirTvl8CYW6qlXKRajrhhUvgjE
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