High-Precision Dark Halo Virial Masses from Globular Cluster Numbers: Implications for Globular Cluster Formation and Galaxy Assembly

Abstract

We confirm that the number of globular clusters (GCs), N${}_{GC}$, is an excellent tracer of their host galaxy's halo virial mass M${}_{vir}$. The simple linear relation M${}_{vir}=5\times 10^9$ M${}_{\odot }\times$ N${}_{GC}$ fits the data perfectly from M${}_{vir}=10^{10}$ M${}_{\odot }$ to M${}_{vir}=2\times 10^{15}$ M${}_{\odot }$. This result is independent of galaxy morphology and extends statistically into the dwarf galaxy regime with M${}_{vir}=10^8-10^{10}$ M${}_{\odot }$, including the extreme ultra diffuse galaxy DF44. As this correlation does not depend on GC mass it is ideally suited for high-precision determinations of M${}_{vir}$. The linearity is most simply explained by cosmological merging of a high-redshift halo seed population that hosted on average one GC per $5\times 10^8$ M${}_{\odot }$ of dark matter. We show that hierarchical merging is also extremely powerful in restoring a linear correlation and erasing signatures of even a strong secular evolution of GC systems. The cosmological merging scenario also implies a strong decline of the scatter in $N_{GC}$ with increasing virial mass $\delta N_{GC}/N_{GC}\sim M_{vir}^{-1/2}$ in contrast with the observations that show a roughly constant scatter, independent of virial mass. This discrepancy can be explained if errors in determining virial masses from kinematical tracers and gravitational lensing are on the order of a factor of 2. GCs in dwarf satellite galaxies pose a serious problem for high-redshift GC formation scenarios; the dark halo masses of dwarf galaxies hosting GCs therefore might need to be an order of magnitude larger than currently estimated.

arXiv comment11 pages, 4 figures, ApJ in press

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