Kinematic substructure in star clusters constrains star cluster formation

Author:

Arnold Becky1ORCID,Wright Nicholas J1ORCID

Affiliation:

1. Lennard-Jones Laboratory, Keele University , Newcastle, ST5 5BB , UK

Abstract

ABSTRACT The spatial–kinematic structure of 48 young star clusters and associations is investigated. Moran’s I statistic is used to quantify the degree of kinematic substructure in each region, and the results are compared to those expected assuming the hierarchical or monolithic models of star cluster formation. Of the observed regions, 39 are found to have significant kinematic substructure, such that they are compatible with the hierarchical model and incompatible with the monolithic model. This includes multiple regions whose Q parameter shows the region to be centrally concentrated and clustered. The remaining nine are compatible with both models. From this, it is concluded that the kinematic substructure of the observed star clusters represents strong evidence in favour of the hierarchical model of star cluster formation over the monolithic model.

Funder

Leverhulme Trust

Publisher

Oxford University Press (OUP)

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. The Gaia-ESO Survey: 3D dynamics of young groups and clusters from GES and Gaia EDR3;Monthly Notices of the Royal Astronomical Society;2024-07-26

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