دورية أكاديمية

New Parameters for Star Cluster Dynamics: The Effect of Primordial Binaries and Dark Remnants

التفاصيل البيبلوغرافية
العنوان: New Parameters for Star Cluster Dynamics: The Effect of Primordial Binaries and Dark Remnants
المؤلفون: B. Bhat, B. Lanzoni, F. R. Ferraro, E. Vesperini
المصدر: The Astrophysical Journal, Vol 945, Iss 2, p 164 (2023)
بيانات النشر: IOP Publishing, 2023.
سنة النشر: 2023
المجموعة: LCC:Astrophysics
مصطلحات موضوعية: Globular star clusters, Stellar dynamics, Astrophysics, QB460-466
الوصف: By studying the normalized cumulative radial distribution (nCRD) of the stars in the central region of a Monte Carlo-simulated globular cluster, we recently defined three parameters able to pinpoint the stage of internal dynamical evolution reached by the system: A _5 (i.e., the area subtended by the nCRD within 5% of the half-mass radius, r _h ), P _5 (the value of the nCRD at 5% r _h ), and S _2.5 (the slope of the nCRD at 2.5% r _h ). Here we extend the analysis and explore the effects that different fractions (0%, 10%, and 20%) of primordial binaries and stellar mass black holes (BHs) induce on the dynamical history of the system. As expected, the gradual contraction of the cluster becomes milder and core collapse shallower for an increasing binary fraction. Nevertheless, the cluster dynamical evolution is still properly traced by the three parameters. For models with a larger initial retention of stellar mass BHs, the evolution depends on the timescale of their subsequent dynamical ejection. An early dynamical ejection of BHs results in a long-term evolution of the three parameters similar to that found in systems without initial BH retention. Conversely, in the model that retains a large number of BHs for an extended time (slow dynamical ejection of BHs), the system is characterized by a less concentrated structure and by the lack of significant temporal evolution of the three parameters. The lower values of the three parameters found in this case might be used to indirectly infer the possible presence of BHs in the cluster.
نوع الوثيقة: article
وصف الملف: electronic resource
اللغة: English
تدمد: 1538-4357
Relation: https://doaj.org/toc/1538-4357
DOI: 10.3847/1538-4357/acb434
URL الوصول: https://doaj.org/article/e35db68d46614ed291c1dcc5e3daf952
رقم الأكسشن: edsdoj.35db68d46614ed291c1dcc5e3daf952
قاعدة البيانات: Directory of Open Access Journals
الوصف
تدمد:15384357
DOI:10.3847/1538-4357/acb434