The globular cluster VVV CL002 falling down to the hazardous Galactic centre

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dc.contributor.authorMinniti, Dante
dc.contributor.authorMatsunaga, Noriyuki
dc.contributor.authorFernández-Trincado, José G.
dc.contributor.authorOtsubo, Shogo
dc.contributor.authorSarugaku, Yuki
dc.contributor.authorTakeuchi, Tomomi
dc.contributor.authorKatoh, Haruki
dc.contributor.authorHamano, Satoshi
dc.contributor.authorIkeda, Yuji
dc.contributor.authorKawakita, Hideyo
dc.contributor.authorLucas, Philip W.
dc.contributor.authorSmith, Leigh C.
dc.date.accessioned2024-04-19T19:28:15Z
dc.date.available2024-04-19T19:28:15Z
dc.date.issued2024-03-01
dc.descriptionIndexación: Scopus.
dc.description.abstractContext. The Galactic centre is hazardous for stellar clusters because of the strong tidal force in action there. It is believed that many clusters were destroyed there and contributed stars to the crowded stellar field of the bulge and the nuclear stellar cluster. However, the development of a realistic model to predict the long-term evolution of the complex inner Galaxy has proven difficult, and observations of surviving clusters in the central region would provide crucial insights into destruction processes. Aims. Among the known Galactic globular clusters, VVV CL002 is the closest to the centre, at 0.4 kpc, but has a very high transverse velocity of 400 km s-1. The nature of this cluster and its impact on Galactic astronomy need to be addressed with spectroscopic follow up. Methods. Here we report the first measurements of its radial velocity and chemical abundance based on near-infrared high-resolution spectroscopy. Results. We find that this cluster has a counter-rotating orbit constrained within 1.0 kpc of the centre, and as close as 0.2 kpc at the perigalacticon, confirming that the cluster is not a passerby from the halo but a genuine survivor enduring the harsh conditions of the tidal forces of the Galactic mill. In addition, its metallicity and α abundance ([α/Fe] ≃ +0.4 and [Fe/H] = -0.54) are similar to those of some globular clusters in the bulge. Recent studies suggest that stars with such α-enhanced stars were more common at 3- 6 kpc from the centre around 10 Gyr ago. Conclusions. We infer that VVV CL002 was formed outside but is currently falling down to the centre, showcasing a real-time event that must have occurred to many clusters a long time ago.
dc.description.urihttps://www-scopus-com.recursosbiblioteca.unab.cl/record/display.uri?eid=2-s2.0-85188015394&origin=resultslist&sort=plf-f&src=s&nlo=&nlr=&nls=&sid=e4c7afa8ed5ed76387be2f840de60591&sot=aff&sdt=cl&cluster=scofreetoread%2c%22all%22%2ct&sl=61&s=AF-ID%28%22Universidad+Andr%c3%a9s+Bello%22+60002636%29+AND+SUBJAREA%28PHYS%29&relpos=8&citeCnt=0&searchTerm=
dc.identifier.citationAstronomy and Astrophysics Open Access Volume 6831 March 2024 Article number A150
dc.identifier.doi10.1051/0004-6361/202348100
dc.identifier.issn00046361
dc.identifier.urihttps://repositorio.unab.cl/handle/ria/56153
dc.language.isoen
dc.publisherEDP Sciences
dc.rights.licenseCC BY 4.0 DEED Attribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectGalaxy
dc.subjectnucleus
dc.subjectGlobular clusters: general
dc.subjectStars: abundances
dc.titleThe globular cluster VVV CL002 falling down to the hazardous Galactic centre
dc.typeArtículo
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