First phase space portrait of a hierarchical stellar structure in the Milky Way
E. Dalessandro, A.L. Varri, M. Tiongco, E. Vesperini, C. Fanelli, A., Mucciarelli, L. Origlia, M. Bellazzini, S. Saracino, E. Oliva, N. Sanna, M., Fabrizio, A. Livernois

TL;DR
This paper provides the first detailed observational phase-space portrait of a hierarchical stellar structure in the Milky Way, revealing complex cluster interactions and suggesting ongoing cluster assembly in the Galactic disk.
Contribution
It presents new observational evidence of a multi-cluster system with a massive halo, indicating an intermediate stage of cluster assembly in the Milky Way disk.
Findings
Seven co-moving clusters identified, including three new ones.
Evidence of mutual interactions and intra-cluster over-densities.
The stellar complex may evolve into a massive stellar system.
Abstract
We present the first detailed observational picture of a possible ongoing massive cluster hierarchical assembly in the Galactic disk as revealed by the analysis of the stellar full phase-space (3D positions and kinematics and spectro-photometric properties) of an extended area ( diameter) surrounding the well-known and Persei double stellar cluster in the Perseus Arm. Gaia-EDR3 shows that the area is populated by seven co-moving clusters, three of which were previously unknown, and by an extended and quite massive () halo. All stars and clusters define a complex structure with evidence of possible mutual interactions in the form of intra-cluster over-densities and/or bridges. They share the same chemical abundances (half-solar metallicity) and age ( Myr) within a small confidence interval and the stellar density distribution of the…
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