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- Title
Possibilities of identifying members from Milky Way satellite galaxies using unsupervised machine learning algorithms.
- Authors
Divakar, Devika K.; Saraf, Pallavi; Sivarani, Thirupathi; Doddamani, Vijayakumar H.
- Abstract
A detailed study of stellar populations in Milky Way (MW) satellite galaxies remains an observational challenge due to their faintness and fewer spectroscopically confirmed member stars. We use unsupervised machine learning methods to identify new members for nine nearby MW satellite galaxies using Gaia data release-3 (Gaia DR3) astrometry, the Dark Energy Survey (DES) and the DECam Local Volume Exploration Survey (DELVE) photometry. Two density-based clustering algorithms, DBSCAN and HDBSCAN, have been used in the four-dimensional astrometric parameter space ( α 2016 , δ 2016 , μ α cos δ , μ δ ) to identify member stars belonging to MW satellite galaxies. Our results indicate that we can recover more than 80% of the known spectroscopically confirmed members in most satellite galaxies and also reject 95–100% of spectroscopic non-members. We have also added many new members using this method. We compare our results with previous studies using photometric and astrometric data and discuss the suitability of density-based clustering methods for MW satellite galaxies.
- Subjects
MACHINE learning; STARS; STELLAR populations; ASTROMETRY; DARK energy; MILKY Way
- Publication
Journal of Astrophysics & Astronomy, 2024, Vol 45, Issue 1, p1
- ISSN
0250-6335
- Publication type
Article
- DOI
10.1007/s12036-023-09990-4