The Distribution and Ages of Star Clusters in the Small Magellanic Cloud: Constraints on the Interaction History of the Magellanic Clouds

Theodoros Bitsakis, R. A. González-Lópezlira, P. Bonfini, G. Bruzual, G. Maravelias, Dennis F Zaritsky, S. Charlot, V. H. Ramírez-Siordia

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We present a new study of the spatial distribution and ages of the star clusters in the Small Magellanic Cloud (SMC). To detect and estimate the ages of the star clusters we rely on the new fully automated method developed by Bitsakis et al. Our code detects 1319 star clusters in the central 18 deg2 of the SMC we surveyed (1108 of which have never been reported before). The age distribution of those clusters suggests enhanced cluster formation around 240 Myr ago. It also implies significant differences in the cluster distribution of the bar with respect to the rest of the galaxy, with the younger clusters being predominantly located in the bar. Having used the same setup, and data from the same surveys as for our previous study of the LMC, we are able to robustly compare the cluster properties between the two galaxies. Our results suggest that the bulk of the clusters in both galaxies were formed approximately 300 Myr ago, probably during a direct collision between the two galaxies. On the other hand, the locations of the young (≤50 Myr) clusters in both Magellanic Clouds, found where their bars join the H i arms, suggest that cluster formation in those regions is a result of internal dynamical processes. Finally, we discuss the potential causes of the apparent outside-in quenching of cluster formation that we observe in the SMC. Our findings are consistent with an evolutionary scheme where the interactions between the Magellanic Clouds constitute the major mechanism driving their overall evolution.

Original languageEnglish (US)
Article number104
JournalAstrophysical Journal
Volume853
Issue number2
DOIs
StatePublished - Feb 1 2018

Fingerprint

star clusters
Magellanic clouds
histories
history
interactions
age structure
galaxies
collision
spatial distribution
distribution
young
quenching
collisions
causes
estimates

Keywords

  • catalogs
  • galaxies: star clusters: general
  • Magellanic Clouds
  • methods: statistical

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

The Distribution and Ages of Star Clusters in the Small Magellanic Cloud : Constraints on the Interaction History of the Magellanic Clouds. / Bitsakis, Theodoros; González-Lópezlira, R. A.; Bonfini, P.; Bruzual, G.; Maravelias, G.; Zaritsky, Dennis F; Charlot, S.; Ramírez-Siordia, V. H.

In: Astrophysical Journal, Vol. 853, No. 2, 104, 01.02.2018.

Research output: Contribution to journalArticle

Bitsakis, T, González-Lópezlira, RA, Bonfini, P, Bruzual, G, Maravelias, G, Zaritsky, DF, Charlot, S & Ramírez-Siordia, VH 2018, 'The Distribution and Ages of Star Clusters in the Small Magellanic Cloud: Constraints on the Interaction History of the Magellanic Clouds', Astrophysical Journal, vol. 853, no. 2, 104. https://doi.org/10.3847/1538-4357/aaa244
Bitsakis, Theodoros ; González-Lópezlira, R. A. ; Bonfini, P. ; Bruzual, G. ; Maravelias, G. ; Zaritsky, Dennis F ; Charlot, S. ; Ramírez-Siordia, V. H. / The Distribution and Ages of Star Clusters in the Small Magellanic Cloud : Constraints on the Interaction History of the Magellanic Clouds. In: Astrophysical Journal. 2018 ; Vol. 853, No. 2.
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