Multiple populations in external globular glusters: the Fornax dSph, the LMC, and the SMC
HST Proposal 13435

Matteo Monelli (publications @ ADS)
Instituto de Astrofisica de Canarias

Cycle: 21
Category: RESOLVED STELLAR POPULATIONS
Proposal type: GO
Status: completed

HST Proposal Information:

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Proposal Abstract

The fact that the vast majority, if not all, Galactic globular clusters {GCs} host multiple stellar populations is nowadays commonsly accepted, thanks to a well settled observational scenario. Nevertheless, these are relatively recent findings, that brushed away the classical idea that GCs are the closest approximation of simple stellar populations, formed by coeval and chemically homogeneous stars. Since GCs are among the oldest structures formed in the Universe, and are relics of the first epochs of assembling of galaxies, and in particular of our Milky Way, understanding how GCs formed and their early evolution is important to shed light on giant galaxies formation. However, so far multiple populations have been searched only in Galactic old {> 10 Gyr} GCs. With this project we propose to extend such search to old clusters in nearby dwarf galaxies: the Fornax dSph, the LMC and the SMC. This will provide a valuable data set to compare with a ground base data for a large number of Galactic GCs collected by our group in the framework of the SUMO project. The main aim of this project is to verify if multiple populations exist in the GCs of these low mass galaxies, and to verify if their properties are similar to Galactic ones, or if the environment plays a significant role.

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Publications referencing this proposal

1. Multiple Populations in the Old and Massive Small Magellanic Cloud Globular Cluster NGC 121
   Dalessandro, E. et al. 2016ApJ...829...77D
   

2. The search for multiple populations in Magellanic Cloud clusters - I. Two stellar populations in the Small Magellanic Cloud globular cluster NGC 121
   Niederhofer, F. et al. 2017MNRAS.464...94N
   

3. Age as a major factor in the onset of multiple populations in stellar clusters
   Martocchia, S. et al. 2018MNRAS.473.2688M
   

4. Helium Variation in Four Small Magellanic Cloud Globular Clusters
   Lagioia, E. P. et al. 2019ApJ...871..140L
   

5. Interplay between physics and geometry in Balmer filaments: the case of SN 1006
   Bandiera, R. et al. 2019MNRAS.483.1537B
   

6. Star-density Profiles of Six Old Star Clusters in the Large Magellanic Cloud
   Lanzoni, Barbara et al. 2019ApJ...887..176L
   

7. Is Fornax 4 the nuclear star cluster of the Fornax dwarf spheroidal galaxy?
   Martocchia, S. et al. 2020MNRAS.495.4518M
   

8. The bursty star formation history of the Fornax dwarf spheroidal galaxy revealed with the HST
   Rusakov, Vadim et al. 2021MNRAS.502..642R
   

9. Role of host galaxy in the formation of multiple stellar populations: analysis of NGC 1786 and NGC 1898
   Vanaraj, Viswajith et al. 2021MNRAS.507..282V
   

10. The impact of satellite trails on Hubble Space Telescope observations
    Kruk, S. et al. 2023NatAs...7..262K
    

11. Harnessing the Hubble Space Telescope Archives: A Catalog of 21,926 Interacting Galaxies
    O'Ryan, David et al. 2023ApJ...948...40O
    

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