Mysterious Globular Cluster System of the Peculiar Massive Galaxy M85

TL;DR

This study analyzes the stellar populations and kinematics of globular clusters in galaxy M85, revealing diverse origins, complex rotation patterns, and recent merging events shaping its peculiar GC system.

Contribution

It provides detailed spectroscopic analysis of GCs in M85, uncovering their ages, metallicities, and kinematic properties, and links these to the galaxy's merger history.

Findings

GC subpopulations have mean ages of 10 Gyr with different metallicities.

Inner GCs show disk-like rotation, especially the RGCs.

BGCs exhibit a flat velocity dispersion profile, indicating dark matter extent.

Abstract

We present a study on stellar population and kinematics of globular clusters (GCs) in the peculiar galaxy M85. We obtain optical spectra of 89 GCs at 8 kpc $< R <$ 160 kpc using the MMT/Hectospec. We divide them into three groups, blue/green/red GCs (B/G/RGCs), with their $(g-i)_0$ colors. All GC subpopulations have mean ages of 10 Gyr, but showing differences in metallicities. The BGCs and RGCs are the most metal-poor ([Z/H] $\sim -1.49$) and metal-rich ([Z/H] $\sim -0.45$), respectively, and the GGCs are in between. We find that the inner GC system exhibits a strong overall rotation that is entirely due to a disk-like rotation of the RGC system. The BGC system shows little rotation. The GGCs show kinematic properties clearly distinct among the GC subpopulations, having higher mean velocities than the BGCs and RGCs and being aligned along the major axis of M85. This implies that the GGCs have an origin different from the other GC subpopulations. The rotation-corrected velocity dispersion of the RGC system is much lower than that of the BGC system, indicating the truncation of the red halo of M85. The BGCs have a flat velocity dispersion profile out to $R$ = 67 kpc, reflecting the dark matter extent of M85. Using the velocity dispersion of the BGC system, we estimate the dynamical mass of M85 to be $3.8 \times 10^{12} M_{\odot}$. We infer that M85 has undergone merging events lately, resulting in the peculiar kinematics of the GC system.