AstroGrav iconAstroGrav Help /Sample Simulations /Abstract Systems /Globular Cluster CollisionVersion 3.4.1

Globular Cluster Collision

Introduction

This simulation shows two globular clusters on a collision course, each containing 401 identical stars.

How it was created

It was created by making a new simulation, and then using the Edit / Add Family... command with the 3D Globular Cluster quick setup, edited to a radius of 1.0e9 m, a luminosity of 1.0e27 W, a mass of 1.0e30 kg, and a semi-major axis from 1.0e13 m to 1.0e17 m. To create the core star of the second globular cluster, the object at the head of the tree was then selected, and the Edit / Add Object... command used, edited to a radius of 1.0e9 m, a luminosity of 1.0e27 W, a mass of 1.0e30 kg, a semi-major axis of 1.0e18 m, an eccentricity of 0.95, and a true anomaly of -2.75 rad. The rest of the second globular cluster was then created in the same way as the first globular cluster was created. The object at the head of the second globular cluster's tree (B/215) was then edited to a semi-major axis of 1.0e18 m, an eccentricity of 0.95, and a true anomaly of -2.75 rad.

What you can do with it

If you set the system running, you can watch how it evolves, and see how the two globular clusters pass through each other relatively unscathed. The speed of the simulation is quite slow, and you may have to leave to it running for several hours before the interaction of the two clusters is completed.

Ideas for further investigation

If you change the eccentricity of the object at the head of the second globular cluster's tree (B/215) from 0.95 to 0.99, this will produce a closer collision that in the original simulation. If you set this alternative system running, you can watch how it evolves, and see how the two globular clusters intermingle to form one large globular cluster, instead of passing through each other as in the original simulation.



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