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Globular clusters (GCs) are old massive star clusters that serve as `fossils' of galaxy formation. The advent of Gaia observatory has enabled detailed kinematics studies of the Galactic GCs and revolutionized our understanding of the…

Astrophysics of Galaxies · Physics 2022-07-12 Yingtian Chen , Oleg Y. Gnedin

We probe the evolution of globular clusters that could form in giant molecular clouds within high-redshift galaxies. Numerical simulations demonstrate that the large and dense enough gas clouds assemble naturally in current hierarchical…

Astrophysics · Physics 2009-11-13 Oleg Y. Gnedin , Jose L. Prieto

Age is one of the most fundamental parameters of stars, yet it is one of the hardest to determine as it requires modelling various aspects of stellar formation and evolution. When we compare the ages derived from isochronal and dynamical…

Solar and Stellar Astrophysics · Physics 2023-11-23 Núria Miret Roig , João Alves , David Barrado , Andreas Burkert , Sebastian Ratzenböck , Ralf Konietzka

Several observational studies have shown that many Galactic globular clusters (GCs) are characterised by internal rotation. Theoretical studies of the dynamical evolution of rotating clusters have predicted that, during their long-term…

Astrophysics of Galaxies · Physics 2023-04-05 M. Scalco , A. Livernois , E. Vesperini , M. Libralato , A. Bellini , L. R. Bedin

Blue straggler stars are more massive than the average star in globular clusters, as they originate from the merger of two stars. Consequently, they experience dynamical friction, progressively sinking to the cluster center. Recently,…

Astrophysics of Galaxies · Physics 2020-04-08 Mario Pasquato

In previous papers of the series we used a combination of optical and near-infrared colours to derive constraints on the relative age structure in globular cluster systems. Here, we present the details, strength and limitations of our…

Astrophysics · Physics 2009-11-10 Maren Hempel , Markus Kissler-Patig

We constructed a Hubble Space Telescope (HST) astro-photometric catalog of the central region of the Galactic globular cluster NGC 1261. This catalog, complemented with Gaia DR2 data sampling the external regions, has been used to estimate…

Solar and Stellar Astrophysics · Physics 2020-05-27 S. Raso , M. Libralato , A. Bellini , F. R. Ferraro , B. Lanzoni , M. Cadelano , C. Pallanca , E. Dalessandro , G. Piotto , J. Anderson , S. T. Sohn

Globular clusters are among the most congested stellar systems in the Universe. Internal dynamical evolution drives them toward states of high central density, while simultaneously concentrating the most massive stars and binary systems in…

Solar and Stellar Astrophysics · Physics 2015-06-22 Stephen L. W. McMillan

This review discusses (i) dynamical methods for determining the masses of Galactic and extragalactic star clusters, (ii) dynamical processes and their time-scales for the evolution of clusters, including evaporation, mass segregation, core…

Astrophysics · Physics 2007-05-23 Ortwin Gerhard

We summarize the results of recent theoretical work on the dynamical evolution of globular clusters containing primordial binaries. Even a very small initial binary fraction (e.g., 10%) can play a key role in supporting a cluster against…

Astrophysics · Physics 2015-05-20 Frederic A. Rasio , John M. Fregeau , Kriten J. Joshi

The study of star cluster evolution necessitates modeling how their density profiles develop from their natal gas distribution. Observational evidence indicates that many star clusters follow a Plummer-like density profile. However, most…

We present a detailed analysis of the internal dynamics of multiple stellar populations (MPs) in 28 Galactic Globular Clusters (GCs) across a wide field of view, extending from the innermost regions to the clusters' outskirts. Using…

We study the dynamical evolution of globular clusters containing primordial binaries, including full single and binary stellar evolution using our Monte Carlo cluster evolution code updated with an adaptation of the single and binary…

Astrophysics of Galaxies · Physics 2014-11-20 Sourav Chatterjee , John M. Fregeau , Stefan Umbreit , Frederic A. Rasio

We present a homogeneous catalogue for blue straggler, red giant branch, horizontal branch and main-sequence turn-off stars in a sample of 35 clusters taken from the ACS Survey for Globular Clusters. As a result of the superior photometry…

Solar and Stellar Astrophysics · Physics 2015-05-28 Nathan Leigh , Alison Sills , Christian Knigge

The dynamical state of galaxy clusters describes if clusters are relaxed dynamically or in a merging process of subclusters. By using archival images from the Chandra X-ray Observatory, we derive a set of parameters to describe the…

Astrophysics of Galaxies · Physics 2025-09-29 Z. S. Yuan , J. L. Han

During cluster assembly, a cluster's virialization process leaves behind signatures that can provide information on its dynamical state. However, no clear consensus yet exists on the best way to achieve this. Therefore, we attempt to derive…

Astrophysics of Galaxies · Physics 2024-07-30 Hyowon Kim , Rory Smith , Jongwan Ko , Jong-Ho Shinn , Kyungwon Chun , Jihye Shin , Jaewon Yoo

The observed properties of young star clusters, such as the core radius and luminosity profile, change rapidly during the early evolution of the clusters. Here we present observations of 6 young clusters in M51 where we derive their sizes…

Astrophysics · Physics 2009-11-13 N. Bastian , M. Gieles , S. P. Goodwin , G. Trancho , L. J. Smith , I. Konstantopoulos , Yu. Efremov

Dynamical mass estimates of simple systems such globular clusters (GCs) still suffer from up to a factor of 2 uncertainty. This is primarily due to the oversimplifications of standard dynamical models that often neglect the effects of the…

Astrophysics of Galaxies · Physics 2021-03-31 Jonathan Chardin , Paolo Bianchini

In this work, we investigate the dynamical properties of 38 Galactic open clusters: 34 of them are located at low Galactic latitudes (|b| < 10$^{\circ}$) and are projected against dense stellar fields; the other 4 comparison objects present…

Astrophysics of Galaxies · Physics 2020-12-16 M. S. Angelo , W. J. B. Corradi , J. F. C. Santos , F. F. S. Maia , F. A. Ferreira

We present simulations of the dynamical evolution of young embedded star clusters. Our initial conditions are directly derived from X-ray, infrared, and radio observations of local systems, and our models evolve both gas and stars…

Astrophysics of Galaxies · Physics 2018-03-20 Alison Sills , Steven Rieder , Jennifer Scora , Jessica McCloskey , Sarah Jaffa