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http://hdl.handle.net/20.500.12386/31719
Titolo: | First Phase Space Portrait of a Hierarchical Stellar Structure in the Milky Way | Autori: | Dalessandro, Emanuele Varri, A. L. Tiongco, M. Vesperini, E. Fanelli, C. Mucciarelli, A. ORIGLIA, Livia BELLAZZINI, Michele Saracino, S. OLIVA, Ernesto SANNA, Nicoletta FABRIZIO, Michele Livernois, A. |
Data pubblicazione: | 2021 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 909 | Fascicolo: | 1 | Da pagina:: | 90 | 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 (6° diameter) surrounding the well-known h and χ Persei double stellar cluster in the Perseus Arm. Gaia-EDR3 shows that the area is populated by seven comoving clusters, three of which were previously unknown, and by an extended and quite massive (M ∼ 10<SUP>5</SUP> M<SUB>⊙</SUB>) halo. All stars and clusters define a complex structure with evidence of possible mutual interactions in the form of intra-cluster overdensities and/or bridges. They share the same chemical abundances (half-solar metallicity) and age (t ∼ 20 Myr) within a small confidence interval and the stellar density distribution of the surrounding diffuse stellar halo resembles that of a cluster-like stellar system. The combination of these pieces of evidence suggests that stars distributed within a few degrees from h and χ Persei are part of a common, substructured stellar complex that we named LISCA I. Comparison with results obtained through direct N-body simulations suggest that LISCA I may be at an intermediate stage of an ongoing cluster assembly that can eventually evolve in a relatively massive (a few times 10<SUP>5</SUP> M<SUB>⊙</SUB>) stellar system. We argue that such a cluster formation mechanism may be quite efficient in the Milky Way and disk-like galaxies and, as a consequence, it has a relevant impact on our understanding of cluster formation efficiency as a function of the environment and redshift. | URI: | http://hdl.handle.net/20.500.12386/31719 | URL: | https://api.elsevier.com/content/abstract/scopus_id/85103251220 https://iopscience.iop.org/article/10.3847/1538-4357/abda43 |
ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/abda43 | Bibcode ADS: | 2021ApJ...909...90D | Fulltext: | open |
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