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Globular clusters (GCs) are some of the most visible tracers of the mergingand accretion history of galaxy halos. Metal-poor GCs, in particular, arethought to arrive in massive galaxies largely through dry, minor mergingevents, but it is rare to see a direct connection between GCs and visiblestellar streams. NGC 474 is a post-merger early-type galaxy with dramatic finestructures made of concentric shells and radial streams that have been moreclearly revealed by deep imaging. We present a study of GCs in NGC 474 tobetter establish the relationship between merger-induced fine structure and theGC system. We find that many GCs are superimposed on visible streams andshells, and about 35% of GCs outside $3R_{\rm e,galaxy}$ are located in regionsof fine structure. The spatial correlation between the GCs and fine structureis significant at the 99.9% level, showing that this correlation is notcoincidental. The colors of the GCs on the fine structures are mostly blue, andwe also find an intermediate-color population that is dominant in the centralregion, and which will likely passively evolve to have colors consistent with atraditional metal-rich GC population. The association of the blue GCs with finestructures is direct confirmation that many metal-poor GCs are accreted ontomassive galaxy halos through merging events, and that progenitors of thesemergers are sub-L* galaxies.

Globular Clusters As Tracers of Fine Structure in the Dramatic Shell Galaxy NGC 474