A highly efficient measure of mass segregation in star clusters

Abstract

Investigations of mass segregation are of vital interest for the understanding of the formation and dynamical evolution of stellar systems on a wide range of spatial scales. Our method is based on the minimum spanning tree (MST) that serves as a geometry-independent measure of concentration. Compared to previous such approaches we obtain a significant refinement by using the geometrical mean as an intermediate-pass. It allows the detection of mass segregation with much higher confidence and for much lower degrees of mass segregation than other approaches. The method shows in particular very clear signatures even when applied to small subsets of the entire population. We confirm with high significance strong mass segregation of the five most massive stars in the Orion Nebula Cluster (ONC). Our method is the most sensitive general measure of mass segregation so far and provides robust results for both data from simulations and observations. As such it is ideally suited for tracking mass segregation in young star clusters and to investigate the long standing paradigm of primordial mass segregation by comparison of simulations and observations.

11 pages, 9 figures, accepted by A&A

References in corpus (13)

• The distance to the Orion Nebula
• Dynamical mass segregation on a very short timescale
• Using the minimum spanning tree to trace mass segregation
• Kinematic Structure of the Orion Nebula Cluster and its Surroundings
• The secrets of the nearest starburst cluster: II. The present-day mass function in NGC 3603
• Tracing the young massive high-eccentricity binary system Theta 1 Orionis C through periastron passage
• A comprehensive Nbody study of mass segregation in star clusters: Energy equipartition and escape
• Star Formation in Space and Time: The Orion Nebula Cluster
• The distance to the Orion Nebula Cluster
• No evidence for mass segregation in massive young clusters
• A highly efficient measure of mass segregation in star clusters
• A new method to create initially mass segregated star clusters in virial equilibrium
• Rapid dynamical mass segregation and properties of fractal star clusters

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