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The origin of the Milky Way globular clusters

Renaud, Florent LU ; Agertz, Oscar LU and Gieles, Mark (2017) In Monthly Notices of the Royal Astronomical Society 465(3). p.3622-3636
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 that are accreted on to 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... (More)

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 that are accreted on to 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.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Galaxies: formation, Galaxies: star clusters: general, Methods: numerical
in
Monthly Notices of the Royal Astronomical Society
volume
465
issue
3
pages
15 pages
publisher
Oxford University Press
external identifiers
  • scopus:85014643211
ISSN
0035-8711
DOI
10.1093/mnras/stw2969
language
English
LU publication?
yes
id
fa78914c-6b62-49f6-bb08-4905605218cd
date added to LUP
2019-02-07 11:13:24
date last changed
2020-04-02 02:20:05
@article{fa78914c-6b62-49f6-bb08-4905605218cd,
  abstract     = {<p>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 that are accreted on to 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.</p>},
  author       = {Renaud, Florent and Agertz, Oscar and Gieles, Mark},
  issn         = {0035-8711},
  language     = {eng},
  month        = {01},
  number       = {3},
  pages        = {3622--3636},
  publisher    = {Oxford University Press},
  series       = {Monthly Notices of the Royal Astronomical Society},
  title        = {The origin of the Milky Way globular clusters},
  url          = {http://dx.doi.org/10.1093/mnras/stw2969},
  doi          = {10.1093/mnras/stw2969},
  volume       = {465},
  year         = {2017},
}