| Download | - View final version: Globular clusters as tracers of fine structure in the dramatic shell galaxy NGC 474 (PDF, 1.7 MiB)
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| DOI | Resolve DOI: https://doi.org/10.3847/1538-4357/835/2/123 |
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| Author | Search for: Lim, Sungsoon; Search for: Peng, Eric W.1; Search for: Duc, Pierre-Alain; Search for: Fensch, Jérémy; Search for: Durrell, Patrick R.1; Search for: Harris, William E.; Search for: Cuillandre, Jean-Charles; Search for: Gwyn, Stephen2; Search for: Lançon, Ariane; Search for: Sánchez-Janssen, Rúben2 |
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| Affiliation | - National Research Council of Canada. NRC Herzberg Institute of Astrophysics
- National Research Council of Canada. Herzberg Astronomy and Astrophysics
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| Format | Text, Article |
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| Subject | galaxies: elliptical and lenticular, cD; galaxies: evolution; galaxies: formation; galaxies: individual (NGC 474); galaxies: star clusters: general |
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| Abstract | 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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| Publication date | 2017-02-01 |
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| Publisher | American Astronomical Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| NPARC number | 23003087 |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | bfe67877-eb0c-46bd-8d76-7ffcbfb8ad16 |
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| Record created | 2018-04-19 |
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| Record modified | 2020-05-30 |
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