Discovery of an Unbound Flyby Companion of UBC 63: In the Immediate Aftermath of a Close Encounter

arXiv:2607.18224 · astro-ph.GA, astro-ph.SR · Submitted 2026-07-20 · Read on arXiv

Samrat Biswas, Biman J Medhi, Sergio Messina, Zhanpeng Zhu, Songmei Qin, Sukanta Deb, A. H. Sheikh, H. S Das, Motohide Tamura, Maheshwar Gopinathan, Ram sagar

astro-ph.GA, astro-ph.SR

Submitted: 2026-07-20

Comments: 10 pages, 11 figures, 2 tables; Accepted for publication in The Astronomical Journal

DOI: 10.3847/1538-3881/ae8c38

Code: https://github.com/AlbrechtKamlah/mcluster

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

Terminology

• Metallicity — 6× in this paper · explained in 3 episodes
• N-body simulations — 3× in this paper · explained in 2 episodes
• Trace — 3× in this paper · explained in 2 episodes
• Consistency — 2× in this paper · explained in 3 episodes
• Alignment — 1× in this paper · explained in 1 episode
• Bayesian Information Criterion — 1× in this paper
• Core — 1× in this paper · explained in 2 episodes
• D Mahalanobis Distance — 1× in this paper
• Department of Science and Technology — 1× in this paper
• Gaussian Mixture Model (GMM) — 1× in this paper · explained in 2 episodes
• Monte Carlo — 1× in this paper
• NN-assisted Gaussian Mixture Model — 1× in this paper

Sources

• A Survey of Compact Star Clusters in the South-West Field of the M31 Disk. Structural Parameters

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