银河系中潮汐双星团尚无令人信服的证据

中文摘要 AI 辅助

背景。利用Gaia DR3天体测量数据和最近的双星团及星群目录，人们多次提出银河系中存在潮汐双星团（TBCs）。然而，通过潮汐捕获形成真正束缚双星团的动力学可行性仍不确定。目的。我们对Liu等人（2025）的双星团和成组星团目录中目前被宣称属于潮汐双星团的二十个星团进行了系统性重新评估，以确定其分类。方法。对于每个候选星团对，我们使用Gaia DR3天体测量和测光数据，同时且自洽地优化年龄、距离模数、红化和金属丰度。结果。我们的分析表明，所有被研究的潮汐双星团都不满足年龄与独立形成相容这一物理条件。在应用严格的演化标准后，这些系统更自然地解释为原始星团对或星群的同年龄成员，而非潮汐捕获的产物。结论。我们得出结论，真正的潮汐双星团（如果存在于银河系中）必定极其罕见。这项工作强调了在未来搜索动力学组装的星团对时，可靠的年龄测定和基于物理的选择标准的重要性。

英文摘要

Context. The existence of tidal binary clusters (TBCs) in the Milky Way has been repeatedly suggested using Gaia DR3 astrometry and recent catalogs of binary clusters and groups. However, the dynamical feasibility of forming truly bound binary clusters through tidal capture remains uncertain. Aims. We perform a systematic reassessment of twenty star clusters, currently claimed as members of TBCs from the catalog of binary and grouped clusters of Liu et al. (2025) to ascertain their classification. Methods. For each candidate pair, we use Gaia DR3 astrometry and photometry to perform a simultaneous and self-consistent opti mization of age, distance modulus, reddening, and metallicity. Results. Our analysis shows that all studied TBCs fail in the required physical condition that ages are compatible with independent formation. After applying strict evolutionary criteria, these systems are more naturally explained as co-eval members of primordial cluster pairs or groups rather than products of tidal capture. Conclusions. We conclude that genuine tidal binary clusters, if present in the Milky Way, must be extremely rare. This work un derscores the importance of robust age determinations and physically motivated selection criteria in future searches for dynamically assembled cluster pairs.

发表机构

• Facultad de Ciencias, Universitat Autònoma de Barcelona (UAB)（巴塞罗那自治大学理学院）
• Institute of Graduate Studies In Sciences, İstanbul University（伊斯坦布尔大学高等研究院）

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6 pages, 1 figure, 2 tables