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Searching for the Extra-tidal Stars of Globular Clusters Using High-dimensional Analysis and a Core Particle Spray Code by Grondin, Steffani M.; Webb, Jeremy J.; Leigh, Nathan W. C.; Speagle, Joshua S.; Khalifeh, Reem J. is a scholarly article available to read on EtoBox.

What is Searching for the Extra-tidal Stars of Globular Clusters Using High-dimensional Analysis and a Core Particle Spray Code about?

Three-body interactions can eject stars from the core of a globular cluster, causing them to enter the Galactic halo as extra-tidal stars. While finding extra-tidal stars is imperative for understanding cluster evolution, connecting isolated extra-tidal field stars back to their birth cluster is extremely difficult. In this work, we present a new methodology consisting of high-dimensional data analysis and a particle spray code to identify extra-tidal stars of any Galactic globular cluster using M3 as a case study. Using the t-Stochastic Neighbour Embedding (t-SNE) and Uniform Manifold Approximation and Projection (UMAP) machine learning dimensionality reduction algorithms, we first identify a set of 103 extra-tidal candidates in the APOGEE DR17 data catalogue with chemical abundances similar to M3 stars. To confirm each candidate's extra-tidal nature, we introduce corespray - a new Python-based three-body particle spray code that simulates extra-tidal stars for any Galactic globular cluster. Using Gaia EDR3 proper motions and APOGEE DR17 radial velocities, we apply multivariate Gaussian modelling and an extreme deconvolution to identify the extra-tidal candidates that are more lik

Author

Grondin, Steffani M.; Webb, Jeremy J.; Leigh, Nathan W. C.; Speagle, Joshua S.; Khalifeh, Reem J.

Published

2022

Language

EN