| Téléchargement | - Voir la version finale : Globular clusters as tracers of fine structure in the dramatic shell galaxy NGC 474 (PDF, 1.7 Mio)
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| DOI | Trouver le DOI : https://doi.org/10.3847/1538-4357/835/2/123 |
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| Auteur | Rechercher : Lim, Sungsoon; Rechercher : Peng, Eric W.1; Rechercher : Duc, Pierre-Alain; Rechercher : Fensch, Jérémy; Rechercher : Durrell, Patrick R.1; Rechercher : Harris, William E.; Rechercher : Cuillandre, Jean-Charles; Rechercher : Gwyn, Stephen2; Rechercher : Lançon, Ariane; Rechercher : Sánchez-Janssen, Rúben2 |
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| Affiliation | - Conseil national de recherches Canada. Institut Herzberg d'astrophysique du CNRC
- Conseil national de recherches Canada. Herzberg en astronomie et en astrophysique
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| Format | Texte, Article |
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| Sujet | galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: formation; galaxies: individual (NGC 474); galaxies: star clusters: general |
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| Résumé | Globular clusters (GCs) are some of the most visible tracers of the merging and accretion histories of galaxy halos. Metal-poor GCs, in particular, are thought to arrive in massive galaxies largely through dry, minor merging events, but it is rare to see a direct connection between GCs and visible stellar streams. NGC 474 is a post-merger early-type galaxy with dramatic fine structures made of concentric shells and radial streams that have been more clearly revealed by deep imaging. We present a study of GCs in NGC 474 to better establish the relationship between merger-induced fine structure and the GC system. We find that many GCs are superimposed on visible streams and shells, and about 35% of GCs outside 3Re.galaxy are located in regions of fine structure. The spatial correlation between GCs and fine structure is significant at the 99.9% level, which shows that this correlation is not coincidental. The colors of GCs on fine structures are mostly blue, and we also find an intermediate-color population that is dominant in the central region and that will likely passively evolve to have colors consistent with a traditional metal-rich GC population. The association of the blue GCs with fine structures is direct confirmation that many metal-poor GCs are accreted onto massive galaxy halos through merging events and that the progenitors of these mergers are sub-L* galaxies. |
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| Date de publication | 2017-02-01 |
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| Maison d’édition | American Astronomical Society |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro NPARC | 23003087 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | bfe67877-eb0c-46bd-8d76-7ffcbfb8ad16 |
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| Enregistrement créé | 2018-04-19 |
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| Enregistrement modifié | 2020-05-30 |
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