2019
DOI: 10.1093/mnrasl/slz149 View full text |Buy / Rent full text
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Abstract: The cluster M54 lies at the centre of the Sagittarius dwarf spheroidal galaxy, and therefore may be the closest example of a nuclear star cluster. Either in situ star formation, inspiralling globular clusters, or a combination have been invoked to explain the wide variety of stellar sub-populations in nuclear star clusters. Globular clusters are known to exhibit light element variations, which can be identified using the photometric construct called a chromosome map. In this letter, we create chromosome maps f… Show more

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“…Sakari et al 2020;Pfeffer et al 2021). Such an origin was proposed, for example, for ωCentauri, the most massive GC in the MW (Lee et al 1999;Hilker & Richtler 2000;Bekki & Freeman 2003;van de Ven et al 2006;Villanova et al 2014) although the most compelling case has been made for M 54, which is located at the centre of the Sagittarius dwarf galaxy and shows a large spread in iron abundance as well as an extended SFH (Ibata et al 1997;Bellazzini et al 2008;Sills et al 2019;Alfaro-Cuello et al 2019). An origin as stripped NSCs was also proposed for UCDs to explain their high masses and large sizes (see e.g.…”
Section: Complexity In Nuclear Star Clustersmentioning
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“…Sakari et al 2020;Pfeffer et al 2021). Such an origin was proposed, for example, for ωCentauri, the most massive GC in the MW (Lee et al 1999;Hilker & Richtler 2000;Bekki & Freeman 2003;van de Ven et al 2006;Villanova et al 2014) although the most compelling case has been made for M 54, which is located at the centre of the Sagittarius dwarf galaxy and shows a large spread in iron abundance as well as an extended SFH (Ibata et al 1997;Bellazzini et al 2008;Sills et al 2019;Alfaro-Cuello et al 2019). An origin as stripped NSCs was also proposed for UCDs to explain their high masses and large sizes (see e.g.…”
Section: Complexity In Nuclear Star Clustersmentioning
“…Each of the two old stellar populations within the cluster display the characteristic properties of multiple populations (Carretta et al 2010b). While the intermediate age (3 − 9 Gyr) and young components (∼ 2 Gyr) do not display strong evidence for MPs (Sills et al 2019), this may be due to the observed correlation between a populations age and the strength of their MPs (e.g., Martocchia et al 2018;Saracino et al 2020) or association with the field star population of Sagittarius (Alfaro-Cuello et al 2019).…”
Section: Ngc 6715 (M54)mentioning
“…This would provide a quantitative and reliable measurement of its stellar population chemical and kinematical patterns thus allowing a critical assessment of its formation and early evolution (see e.g. Alfaro-Cuello et al 2019;Sills et al 2019), and more in general on the process on NSC formation and galaxy nucleation, being the second closest case after M54 (Bellazzini et al 2008).…”
Section: Discussion a N D C O N C L U S I O N Smentioning