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Mass segregation

About: Mass segregation is a research topic. Over the lifetime, 1024 publications have been published within this topic receiving 57729 citations.


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TL;DR: In this article, Monte Carlo codes were used to follow the collisional evolution of clusters in a variety of scenarios, and it was shown that a VMS can form even in proto-galactic nuclei models with a high velocity dispersion (many 100 km/s).
Abstract: Using Monte Carlo codes, we follow the collisional evolution of clusters in a variety of scenarios. We consider the conditions under which a cluster of main sequence stars may undergo rapid core collapse due to mass segregation, thus entering a phase of runaway collisions, forming a very massive star (VMS, M >= 1000 Msun) through repeated collisions between single stars. Although collisional mass loss is accounted for realistically, we find that a VMS forms even in proto-galactic nuclei models with a high velocity dispersion (many 100 km/s). Such a VMS may be a progenitor for an intermediate-mass black hole (M >= 100 Msun). In contrast, in galactic nuclei hosting a central massive black hole, collisions are found to be disruptive. The stars which are subject to collisions are progressively ground down by high-velocity collisions and a merger sequence appears impossible.

1 citations

Journal ArticleDOI
TL;DR: In this paper, the role of the primordial binary population on the loss of primordial mass segregation was investigated by means of numerical models, and it was shown that the completely mass segregated clusters, even with binaries, are more compatible with the present-day ONC than the non-segregated ones.
Abstract: Observational results of young star-forming regions suggest that star clusters are completely mass segregated at birth. As a star cluster evolves dynamically, these initial conditions are gradually lost. For star clusters with single stars only and a canonical IMF, it has been suggested that traces of these initial conditions vanish at $\tau_{\rm v}$ between 3 and 3.5 half-mass relaxation times. By the means of numerical models, here we investigate the role of the primordial binary population on the loss of primordial mass segregation. We found that $\tau_{\rm v}$ does not seem to depend on the binary star distribution, yielding $3 < \tau_{\rm v} / t_{\rm rh} < 3.5$. We also conclude that the completely mass segregated clusters, even with binaries, are more compatible with the present-day ONC than the non-segregated ones.

1 citations

Journal ArticleDOI
TL;DR: In this paper, the observed core radii of segregated star clusters can be 50% smaller than the true core radius, and the measured radius in the red filters is smaller than those measured in blue filters.
Abstract: In this contribution we study integrated properties of dynamically segregated star clusters. The observed core radii of segregated clusters can be 50% smaller than the ``true'' core radius. In addition, the measured radius in the red filters is smaller than those measured in blue filters. However, these difference are small ($\lesssim10%$), making it observationally challenging to detect mass segregation in extra-galactic clusters based on such a comparison. Our results follow naturally from the fact that in nearly all filters most of the light comes from the most massive stars. Therefore, the observed surface brightness profile is dominated by stars of similar mass, which are centrally concentrated and have a similar spatial distribution.

1 citations

Book ChapterDOI
01 Jan 2000
TL;DR: In this paper, the effects of the mass segregation corrections on the correlations among Global Mass Functions (GMF) of the Globular Clusters and their kinematical parameters are discussed.
Abstract: This communication will be focused upon two main topics: IR observations of Globular Clusters (GC) from the space and the reliability of the mass segregation corrections for Luminosity Functions (LF), observed far away from the half mass radius. The effects of the mass segregation corrections on the correlations among Global Mass Functions (GMF) of the GCs and their kinematical parameters will be finally discussed

1 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202336
202225
202133
202047
201943
201822