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An extragalactic chromosome map: the intermediate-age SMC cluster Lindsay 1

Saracino, S, Bastian, N, Kozhurina-Platais, V, Cabrera-Ziri, I, Dalessandro, E, Kacharov, N, Lardo, C, Larsen, SS, Mucciarelli, A, Platais, I and Salaris, M (2019) An extragalactic chromosome map: the intermediate-age SMC cluster Lindsay 1. Monthly Notices of the Royal Astronomical Society Letters, 489 (1). L97-L101. ISSN 1745-3933

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Abstract

The discovery of star-to-star abundance variations (a.k.a. multiple populations - MPs) within globular clusters (GCs), which are generally not found in the field or in lower mass open clusters, has led to a search for the unique property of GCs that allow them to host this phenomenon. Recent studies have shown that MPs are not limited to the ancient GCs but are also found in massive clusters with ages down to (at least) 2 Gyr. This finding is important for understanding the physics of the MP phenomenon, as these young clusters can provide much stronger constraints (e.g. on potential age spreads within the clusters) than older ones. However, a direct comparison between ancient GCs and intermediate clusters has not yet been possible due to the different filters adopted in their studies. Here we present new HST UV photometry of the 7.5 Gyr, massive SMC cluster, Lindsay 1, in order to compare its pseudo colour-colour diagram to that of Galactic GCs. We find that they are almost identical and conclude that the MPs phenomenon is the same, regardless of cluster age and host galaxy.

Item Type: Article
Additional Information: This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society Letters ©: 2019 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords: 0201 Astronomical and Space Sciences
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: Oxford University Press
Related URLs:
Date Deposited: 08 Nov 2019 12:30
Last Modified: 08 Nov 2019 12:31
DOI or Identification number: 10.1093/mnrasl/slz135
URI: http://researchonline.ljmu.ac.uk/id/eprint/11739

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