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Recent numerical simulations have shown that the unstable disk within the central regime of the primordial gas cloud fragments to form multiple protostars on several scales. Their evolution depends on the mass accretion phenomenon,…

Astrophysics of Galaxies · Physics 2025-01-10 Sukalpa Kundu , Jayanta Dutta

We have investigated the effect of initial mass segregation on the runaway merging of stars. The evolution of multi-mass, dense star clusters was followed by means of direct N-body simulations of up to 131.072 stars. All clusters started…

Astrophysics · Physics 2009-11-13 Eliani Ardi , Holger Baumgardt , Shin Mineshige

We analyze the three-dimensional shapes and kinematics of the young star cluster population forming in a high-resolution GRIFFIN project simulation of a metal-poor dwarf galaxy starburst. The star clusters, which follow a power-law mass…

Astrophysics of Galaxies · Physics 2020-12-02 Natalia Lahén , Thorsten Naab , Peter H. Johansson , Bruce Elmegreen , Chia-Yu Hu , Stefanie Walch

We have determined the amount of stellar mass segregation in over 50 globular clusters and ultra-faint dwarf galaxy candidates based on deep HST and ground-based photometry. We find that the amount of mass segregation in globular clusters…

Astrophysics of Galaxies · Physics 2021-12-22 Holger Baumgardt , Johannes Faller , Nicholas Meinhold , Chandler McGovern-Greco , Michael Hilker

Initial conditions for star formation in clusters are estimated for protostars whose masses follow the initial mass function (IMF) from 0.05 to 10 solar masses. Star-forming infall is assumed equally likely to stop at any moment, due to gas…

Astrophysics of Galaxies · Physics 2015-05-18 Philip C. Myers

We present a method to couple N-body star cluster simulations to a cosmological tidal field, using the Astrophysical Multipurpose Software Environment. We apply this method to star clusters embedded in the CosmoGrid dark matter-only…

Cosmology and Nongalactic Astrophysics · Physics 2013-11-05 Steven Rieder , Tomoaki Ishiyama , Paul Langelaan , Junichiro Makino , Stephen L. W. McMillan , Simon Portegies Zwart

We simulate mergers between star clusters embedded within their natal giant molecular cloud. We extract initial conditions from cloud-scale simulations of cluster formation and introduce different prescriptions for primordial binaries. We…

Astrophysics of Galaxies · Physics 2024-09-23 Claude Cournoyer-Cloutier , Jeremy Karam , Alison Sills , Simon Portegies Zwart , Maite Wilhelm

During their evolution, star clusters undergo mass segregation, by which the orbits of the most massive stars shrink, while the lighter stars move outwards from the cluster centre. In this context, recent observations and dynamical…

Astrophysics of Galaxies · Physics 2015-11-04 Manuel Arca-Sedda

We present a new version of the fast star cluster evolution code Evolve Me A Cluster of StarS (EMACSS). While previous versions of EMACSS reproduced clusters of single-mass stars, this version models clusters with an evolving stellar…

Astrophysics of Galaxies · Physics 2015-06-19 Poul Alexander , Mark Gieles , Henny Lamers , Holger Baumgardt

Mass segregation in star clusters is often thought to indicate the onset of energy equipartition, where the most massive stars impart kinetic energy to the lower-mass stars and brown dwarfs/free floating planets. The predicted net result of…

Astrophysics of Galaxies · Physics 2016-04-20 Richard J. Parker , Simon P. Goodwin , Nicholas J. Wright , Michael R. Meyer , Sascha P. Quanz

Star-forming regions that are visible at 3.6 microns and Halpha but not in the u,g,r,i,z bands of the Sloan Digital Sky survey (SDSS), are measured in five nearby spiral galaxies to find extinctions averaging ~3.8 mag and stellar masses…

We present a large suite of MHD simulations of turbulent, star-forming giant molecular clouds(GMCs) with stellar feedback, extending previous work by simulating 10 different random realizations for each point in the parameter space of cloud…

Using three-dimensional cosmological simulations, we study the assembly process of one of the first galaxies, with a total mass of 10^8 M_sun, collapsing at z = 10. Our main goal is to trace the transport of the heavy chemical elements…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-18 Thomas H. Greif , Simon C. O. Glover , Volker Bromm , Ralf S. Klessen

We study the formation of the first generation of stars in the standard cold dark matter model, using a very high-resolution hydordynamic simulations. Our simulation achieves a dynamic range of 10^{10} in length scale. With accurate…

Astrophysics · Physics 2011-02-11 Naoki Yoshida , Kazuyuki Omukai , Lars Hernquist , Tom Abel

Stars form within dense cores composed of both gas and dust within molecular clouds. However, despite the crucial role that dust plays in the star formation process, its dynamics is frequently overlooked, with the common assumption being a…

Astrophysics of Galaxies · Physics 2025-02-21 Nadine H. Soliman , Philip F. Hopkins , Michael Y. Grudić

We investigate the formation of the first stars at the end of the cosmic dark ages with a suite of three-dimensional, moving mesh simulations that directly resolve the collapse of the gas beyond the formation of the first protostar at the…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-04 Thomas H. Greif , Volker Bromm , Paul C. Clark , Simon C. O. Glover , Rowan J. Smith , Ralf S. Klessen , Naoki Yoshida , Volker Springel

We study the evolution and observability of young, compact star clusters near the Galactic center, such as the Arches and Quintuplet systems. The clusters are modeled by integrating the equations of motion of all stars while accounting for…

Astrophysics · Physics 2009-11-06 Simon Portegies Zwart , Junichiro Makino , Stephen McMillan , Piet Hut

Galaxies in clusters are gas-deficient and a number of possible explanations for this observation have been advanced, including galaxy-cluster tidal interactions, galaxy harassment, and ISM-ICM gas stripping. In this paper, we use a…

Astrophysics · Physics 2009-11-13 Stephanie Tonnesen , Greg L. Bryan , J. H. van Gorkom

We present the results of a numerical simulation of the history and future development of the Pleiades. This study builds on our previous one that established statistically the present-day structure of this system. Our simulation begins…

Solar and Stellar Astrophysics · Physics 2015-05-18 Joseph M. Converse , Steven W. Stahler

We model the formation of star clusters in a dwarf galaxy progenitor during the first $700 ~{\rm Myr}$ of cosmic history using a cosmological radiation-hydrodynamic simulation with a sub-grid star formation efficiency (SFE) model calibrated…

Astrophysics of Galaxies · Physics 2025-10-03 Fred Angelo Batan Garcia , Massimo Ricotti , Kazuyuki Sugimura
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