Structural Diversity Among the Milky Way's Dwarf Spheroidal Satellites

arXiv:2607.09308 · astro-ph.GA · Submitted 2026-07-10 · Read on arXiv

Matthew G. Walker, Raphaël Errani, Andrew B. Pace, Jorge Peñarrubia, Sofia Splawska, Eduardo Vitral

astro-ph.GA

Submitted: 2026-07-10

Comments: to be submitted. Supporting files (input catalogs, samples from posterior PDFs, figures for all galaxies) are available at https://doi.org/10.5281/zenodo.20600394

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Velocity Dispersion — 13× in this paper · explained in 2 episodes
• Core — 10× in this paper · explained in 2 episodes
• Metallicity — 9× in this paper · explained in 3 episodes
• Dark Energy Survey — 6× in this paper
• Lawrence Berkeley National Laboratory — 4× in this paper
• alpha — 4× in this paper · explained in 1 episode
• Anti-correlation — 3× in this paper · explained in 3 episodes
• Association of Universities for Research in Astronomy — 2× in this paper
• Bayesian Inference — 2× in this paper · explained in 5 episodes
• Abundance — 1× in this paper · explained in 1 episode
• Calibration — 1× in this paper · explained in 7 episodes
• Cooperation — 1× in this paper · explained in 2 episodes
• Eidgenossische Technische Hochschule — 1× in this paper
• European Space Agency — 1× in this paper
• Mass Segregation — 1× in this paper · explained in 2 episodes
• Near-Earth Object Wide-field Infrared Survey Explorer — 1× in this paper
• Trace — 1× in this paper · explained in 2 episodes

Sources

• The DECam MAGIC Survey: Uncovering the Tidal Tails of the Crater II Dwarf Galaxy
• Collisional Dynamics of Stars and Dark Matter in Ultra-Faint Galaxies
• Gaia Data Release 3: Summary of the content and survey properties
• Stellar Cores Live Long and Prosper in Cuspy Dark Matter Halos
• Beasts of the Southern Wild: Discovery of nine Ultra Faint satellites in the vicinity of the Magellanic Clouds
• S 5: Tidal Disruption in Crater 2 and Formation of Diffuse Dwarf Galaxies in the Local Group
• The Local Volume Database: a library of the observed properties of nearby dwarf galaxies and star clusters
• Deep Imaging of Grus II and Horologium II: Structure and Extent of Two Ultra-Faint Milky Way Satellites
• Tailored mass estimators for Milky Way dwarf Spheroidals
• Cored galaxies in cuspy dark matter halos

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