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Remember this dwarf galaxy that was presented as lacking dark matter last week (van Dokkum et al. 2018)? #thread
arxiv.org/abs/1803.10237
arxiv.org/abs/1803.10237
Since extraordinary claims require extraordinary proof, my student @Nico_Longeard and I decided to have a look at the claim of very low velocity dispersion and M/L in NGC1052-DF2 and, how to say…
Turns out that sampling a distribution function with 10 tracers is tricky. Small number statistics are a pain and the uncertainties on the velocities of the 10 globular clusters studied in the paper are of order the intrinsic velocity dispersion. #tricky
