#IAUGA2024 has been intense! So I didn't have time to post on X about my latest paper: "Gas-rich ultra-diffuse galaxies are consistent with the baryonic Tully-Fisher relation and with Milgromian dynamics". Available here: arxiv.org/abs/2408.05269 Fact#1: the "UDG" category is systematically biased toward face-on galaxies, which are the worst possible objects to study the Tully-Fisher relation or gas dynamics in general. Indeed UDGs behave like usual face-on dwarf galaxies: nothing special here but low-quality data.

#paperday: "Galaxy clusters in Milgromian dynamics: Missing matter, hydrostatic bias, and the external field effect", lead by former master student Ruth Kelleher and accepted for publication in A&A. Available here: [1/N]arxiv.org/abs/2405.08557 Galaxy clusters are a long-standing issue for MOND because - even in MOND - they require some extra mass, albeit its amount is drastically reduced with respect to non-baryonic dark matter (DM) in Newtonian dynamics. See, e.g., the plot below from Sanders (1999).[2/N]

Paper day! "Fitting the Radial Acceleration Relation to Individual SPARC Galaxies" by our brilliant student Pengfei Li: arxiv.org/abs/1803.00022 A thread will follow! In arxiv.org/abs/1609.05917 and arxiv.org/abs/1610.08981 we show that baryons and dynamics are tightly linked in galaxies at a *local* level: the observed acceleration (from the gas rotation curve) correlates with that expected from the distribution of baryons (using Newton's law).