From observing strategies to velocity dispersion bias: forward modeling unresolved binaries in ultra-faint dwarf galaxies

arXiv:2609.19407 · astro-ph.GA, astro-ph.SR · Submitted 2026-09-16 · Read on arXiv

astro-ph.GA, astro-ph.SR

Submitted: 2026-09-16

Updated: 2026-09-16

Comments: 15 pages + appendices, 6 figures, submitted to ApJ. Code available at https://github.com/xou-mit/binary-observation-simulator

Code: https://github.com/xou-mit/binary-observation-simulator

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

Terminology

• Velocity Dispersion — 73× in this paper · explained in 2 episodes
• Forward modeling — 8× in this paper · explained in 2 episodes
• Metallicity — 4× in this paper · explained in 3 episodes
• Binary Observation Simulator — 3× in this paper
• Consistency — 3× in this paper · explained in 3 episodes
• Robustness — 3× in this paper · explained in 5 episodes
• Calibration — 2× in this paper · explained in 7 episodes
• Accuracy — 1× in this paper · explained in 1 episode
• Adam — 1× in this paper · explained in 2 episodes
• Anisotropy — 1× in this paper · explained in 3 episodes
• Bayesian Inference — 1× in this paper · explained in 5 episodes
• Core — 1× in this paper · explained in 2 episodes
• Simulation-based Inference — 1× in this paper · explained in 2 episodes

Sources

• The abundance and properties of the lowest luminosity dwarf galaxies around the Milky Way: Insights from Semi-Analytic Models
• A Chemodynamical Census of the Milky Way's Ultra-Faint Compact Satellites. I. A First Population-Level Look at the Internal Kinematics and Metallicities of 19 Extremely-Low-Mass Halo Stellar Systems
• A Unified Framework Connecting Chemical Enrichment to Resolved Star Formation Histories with Applications to Local Group Dwarf Irregulars
• The Local Volume Database: a library of the observed properties of nearby dwarf galaxies and star clusters
• The Via Project: Overview of the Science, Instrument, and Survey

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