LISC Catalog of Open Clusters.III. 83 Newly found Galactic disk open clusters using Gaia EDR3

TL;DR

This paper utilizes Gaia EDR3 data and advanced machine learning to identify 83 new open clusters in the Milky Way, expanding the known catalog and highlighting the incompleteness of current surveys.

Contribution

It extends the HDBSCAN method with parallel computing to discover new open clusters in Gaia EDR3 data, significantly increasing the catalog of known clusters.

Findings

Identified 83 new open clusters in Gaia EDR3 data.

Expanded the catalog of Galactic open clusters.

Highlighted the incompleteness of current cluster surveys.

Abstract

As groups of coeval stars born from the same molecular cloud, an Open cluster (OC) is an ideal laboratory for studying the structure and dynamical evolution of the Milky Way. The release of High-Precision Gaia Early Data Release 3 (Gaia EDR3) and modern machine-learning methods offer unprecedented opportunities to identify OCs. In this study, we extended conventional HDBSCAN (e-HDBSCAN) for searching for new OCs in Gaia EDR3. A pipeline was developed based on the parallel computing technique to blindly search for open clusters from Gaia EDR3 within Galactic latitudes $\left| b \right|$ $<$25 $^\circ$. As a result, we obtained 3787 star clusters, of which 83 new OCs were reported after cross-match and visual inspection. At the same time, the main star cluster parameters are estimated by colour-magnitude diagram fitting. The study significantly increases the sample size and physical parameters of open clusters in the catalogue of OCs. It shows the incompleteness of the census of OCs across our Galaxy.