| Autor: |
Giusti, Camilla, Cadelano, Mario, Ferraro, Francesco R., Lanzoni, Barbara, Leanza, Silvia, Pallanca, Cristina, Vesperini, Enrico, Dalessandro, Emanuele, Mucciarelli, Alessio |
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| Zdroj: |
Astrophysical Journal; 8/20/2023, Vol. 953 Issue 2, p1-8, 8p |
| Abstrakt: |
In the context of a project aimed at characterizing the dynamical evolution of old globular clusters in the Large Magellanic Cloud, we have secured deep HST/WFC3 images of the massive cluster NGC 1835. In the field of view of the acquired images, at a projected angular separation of approximately 2′ from the cluster, we detected the small stellar system KMK 88-10. The observations provided the deepest color–magnitude diagram ever obtained for this cluster, revealing that it hosts a young stellar population with an age of 600–1000 Myr. The cluster surface brightness profile is nicely reproduced by a King model with a core radius r c = 4″ (0.97 pc), a half-mass radius r hm = 12″ (2.9 pc), and a concentration parameter c ∼ 1.3 corresponding to a truncation radius r t ∼ 81″ (19.5 pc). We also derived its integrated absolute magnitude (M V = −0.71) and total mass (M ∼ 80–160 M ⊙). The most intriguing feature emerging from this analysis is that KMK 88-10 presents a structure elongated in the direction of NGC 1835, with an intracluster overdensity that suggests the presence of a tidal bridge between the two systems. If confirmed, this would be the first evidence of a tidal capture of a small star cluster by a massive globular. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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