2021
DOI: 10.48550/arxiv.2104.06412
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K. Fahrion,
M. Lyubenova,
G. van de Ven
et al.

Abstract: Nuclear star clusters (NSCs) are the densest stellar systems in the Universe and are found in the centres of all types of galaxies. They are thought to form via mergers of star clusters such as ancient globular clusters (GCs) that spiral to the centre as a result of dynamical friction or through in-situ star formation directly at the galaxy centre. There is evidence that both paths occur, but the relative contribution of either channel and their correlation with galaxy properties are not yet constrained observ… Show more

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Cited by 10 publications
(16 citation statements)
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“…Second, in dwarf galaxies the NSC mass grows with the galaxy stellar mass roughly as √ M (den Brok et al 2014;Sánchez-Janssen et al 2019), matching expectations from theory (Gnedin et al 2014). Third, spectroscopic observations of NSCs in dwarf galaxies suggest they are typically more metalpoor than their surrounding host galaxies (Koleva et al 2009;Paudel et al 2011;Spengler et al 2017;Neumayer et al 2020;Johnston et al 2020;Fahrion et al 2021). Metal-poor NSCs are expected in the case of cluster inspiral because the majority of Milky Way GCs (Harris 1996) and almost all of those in dwarf galaxies (Peng et al 2006) are metal-poor.…”
Section: Introductionsupporting
confidence: 60%
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“…Second, in dwarf galaxies the NSC mass grows with the galaxy stellar mass roughly as √ M (den Brok et al 2014;Sánchez-Janssen et al 2019), matching expectations from theory (Gnedin et al 2014). Third, spectroscopic observations of NSCs in dwarf galaxies suggest they are typically more metalpoor than their surrounding host galaxies (Koleva et al 2009;Paudel et al 2011;Spengler et al 2017;Neumayer et al 2020;Johnston et al 2020;Fahrion et al 2021). Metal-poor NSCs are expected in the case of cluster inspiral because the majority of Milky Way GCs (Harris 1996) and almost all of those in dwarf galaxies (Peng et al 2006) are metal-poor.…”
Section: Introductionsupporting
confidence: 60%
“…Most of these studies have focused on early-type galaxies, where the older stellar populations make it possible to use line index measurements to measure metallicities (Koleva et al 2009;Paudel et al 2011). Overall, these results show that in higher mass galaxies ( 10 9 M ), NSCs are typically more metal-rich than their host galaxies (Neumayer et al 2020;Fahrion et al 2021). This, combined with the flattening observed in some of these same clusters argues for in situ star formation (Spengler et al 2017).…”
Section: Introductionmentioning
confidence: 82%
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“…We only specify the mass for this process to occur and the star clusters to survive. Studies looking at the age and metallicity properties of NSCs will be crucial in assessing the formation pathways, as well as the properties of any successful migrating clusters (Fahrion et al 2021).…”
Section: Limiting Masses For In-spiralling Gcsmentioning
confidence: 99%