An extremely metal-deficient globular cluster in the Andromeda Galaxy.
Science
; 370(6519): 970-973, 2020 11 20.
Article
em En
| MEDLINE
| ID: mdl-33060196
ABSTRACT
Globular clusters (GCs) are dense, gravitationally bound systems of thousands to millions of stars. They are preferentially associated with the oldest components of galaxies, so measurements of their composition can constrain the build-up of chemical elements in galaxies during the early Universe. We report a massive GC in the Andromeda Galaxy (M31), RBC EXT8, that is extremely depleted in heavy elements. Its iron abundance is about 1/800 that of the Sun and about one-third that of the most iron-poor GCs previously known. It is also strongly depleted in magnesium. These measurements challenge the notion of a metallicity floor for GCs and theoretical expectations that massive GCs could not have formed at such low metallicities.
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Base de dados:
MEDLINE
Idioma:
En
Revista:
Science
Ano de publicação:
2020
Tipo de documento:
Article
País de afiliação:
Holanda