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The origin of the Milky Way globular clusters

Renaud, Florent, Agertz, Oscar and Gieles, Mark (2017) The origin of the Milky Way globular clusters Monthly Notices of the Royal Astronomical Society, 465 (3). pp. 3622-3636.

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Abstract

We present a cosmological zoom-in simulation of a Milky Way-like galaxy used to explore the formation and evolution of star clusters. We investigate in particular the origin of the bimodality observed in the colour and metallicity of globular clusters, and the environmental evolution through cosmic times in the form of tidal tensors. Our results self-consistently confirm previous findings that the blue, metal-poor clusters form in satellite galaxies which are accreted onto the Milky Way, while the red, metal-rich clusters form mostly in situ or, to a lower extent in massive, self-enriched galaxies merging with the Milky Way. By monitoring the tidal fields these populations experience, we find that clusters formed in situ (generally centrally concentrated) feel significantly stronger tides than the accreted ones, both in the present-day, and when averaged over their entire life. Furthermore, we note that the tidal field experienced by Milky Way clusters is significantly weaker in the past than at present-day, confirming that it is unlikely that a power-law cluster initial mass function like that of young massive clusters, is transformed into the observed peaked distribution in the Milky Way with relaxation-driven evaporation in a tidal field.

Item Type: Article
Subjects : Physics
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Renaud, Florentf.renaud@surrey.ac.ukUNSPECIFIED
Agertz, Oscaro.agertz@surrey.ac.ukUNSPECIFIED
Gieles, Markm.gieles@surrey.ac.ukUNSPECIFIED
Date : 17 November 2017
Identification Number : 10.1093/mnras/stw2969
Copyright Disclaimer : This is a pre-copyedited, author-produced PDF of an article accepted for publication in Monthly Notices of the Royal Astronomical Society, following peer review. The version of record: Florent Renaud, Oscar Agertz, Mark Gieles; The origin of the Milky Way globular clusters. Mon Not R Astron Soc 2017; 465 (3): 3622-3636. doi: 10.1093/mnras/stw2969 is available online at: https://academic.oup.com/mnras/article/465/3/3622/2544375/The-origin-of-the-Milky-Way-globular-clusters
Uncontrolled Keywords : galaxies: formation — galaxies: star clusters: general — methods: numerical
Related URLs :
Depositing User : Symplectic Elements
Date Deposited : 23 Nov 2016 11:55
Last Modified : 31 Oct 2017 18:57
URI: http://epubs.surrey.ac.uk/id/eprint/812942

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