# Metallicity gradients in the globular cluster systems of early-type galaxies: in situ and accreted components?

@article{Forbes2018MetallicityGI,
title={Metallicity gradients in the globular cluster systems of early-type galaxies: in situ and accreted components?},
author={Duncan A. Forbes and Rhea-Silvia Remus},
journal={Monthly Notices of the Royal Astronomical Society},
year={2018}
}
• Published 5 July 2018
• Physics
• Monthly Notices of the Royal Astronomical Society
Massive early-type galaxies typically have two subpopulations of globular clusters (GCs) which often reveal radial colour (metallicity) gradients. Collating gradients from the literature, we show that the gradients in the metal-rich and metal-poor GC subpopulations are the same, within measurement uncertainties, in a given galaxy. Furthermore, these GC gradients are similar in strength to the {\it stellar} metallicity gradient of the host galaxy. At the very largest radii (e.g. greater than 8…

## Figures and Tables from this paper

Scaling relations for globular cluster systems in early-type galaxies
• Physics
Monthly Notices of the Royal Astronomical Society
• 2019
The formation and growth of globular cluster systems (GCSs) is closely related to the evolutionary processes experienced by their host galaxies. In particular, their radial distributions scale with
The SLUGGS survey: combining stars, globular clusters, and planetary nebulae to understand the assembly history of early-type galaxies from their large radii kinematics
• Physics
• 2021
We investigate the kinematic properties of nine nearby early-type galaxies with evidence of a disk-like component. Three of these galaxies are located in the field, five in the group and only one in
Spatially Resolved Stellar Populations and Kinematics with KCWI: Probing the Assembly History of the Massive Early-type Galaxy NGC 1407
• Physics, Geology
The Astrophysical Journal
• 2019
Using the newly commissioned KCWI instrument on the Keck-II telescope, we analyse the stellar kinematics and stellar populations of the well-studied massive early-type galaxy (ETG) NGC 1407. We
Mapping accreted stars in early-type galaxies across the mass–size plane
• Physics
Monthly Notices of the Royal Astronomical Society
• 2021
Galaxy mergers are instrumental in dictating the final mass, structure, stellar populations, and kinematics of galaxies. Cosmological galaxy simulations indicate that the most massive galaxies at z
The Assembly History of M87 through Radial Variations in Chemical Abundances of Its Field Star and Globular Cluster Populations
• Physics
• 2020
We present an extensive study of spectroscopically-derived chemical abundances for M87 and its globular cluster (GC) system. Using observations from the Mitchell spectrograph at McDonald, LRIS at
The Color Gradients of the Globular Cluster Systems in M87 and M49
• Physics
The Astrophysical Journal
• 2022
Combining data from the ACS Virgo Cluster Survey and the Next Generation Virgo cluster Survey, we extend previous studies of color gradients of the globular cluster (GC) systems of the two most
Nonlinear Color–Metallicity Relations of Globular Clusters. VIII. Reproducing Color Distributions of Individual Globular Cluster Systems in the Virgo and Fornax Galaxy Clusters
• Physics
The Astrophysical Journal Supplement Series
• 2018
The color distributions of globular clusters (GCs) in individual early-type galaxies show great diversity in their morphology. Based on the conventional "linear" relationship between the colors and
Kinematics of simulated galaxies II: Probing the stellar kinematics of galaxies out to large radii
• Physics
Monthly Notices of the Royal Astronomical Society
• 2020
We investigate the stellar kinematics of a sample of galaxies extracted from the hydrodynamic cosmological Magneticum Pathfinder simulations out to five half-mass radii. We construct differential
Keck Cosmic Web Imager (KCWI) spectra of globular clusters and ultracompact dwarfs in the halo of M87
• Physics
• 2020
Using the Keck Cosmic Web Imager we obtain spectra of several globular clusters (GCs), ultra compact dwarfs (UCDs) and the inner halo starlight of M87, at a similar projected galactocentric radius of
Eight more low luminosity globular clusters in the Sagittarius dwarf galaxy
• Physics
Astronomy & Astrophysics
• 2021
Context. The Sagittarius (Sgr) dwarf galaxy is merging with the Milky Way, and the study of its globular clusters (GCs) is important to understand the history and outcome of this ongoing process.

## References

SHOWING 1-10 OF 74 REFERENCES
The SLUGGS survey: Combining stellar and globular cluster metallicities in the outer regions of early-type galaxies
• Physics
• 2015
The outer halo regions of early-type galaxies carry key information about their past accretion history. However, spectroscopically probing the stellar component at such galactocentric radii is still
Evidence for two phases of galaxy formation from radial trends in the globular cluster system of NGC 1407
• Physics
• 2011
Here we present the colours of individual globular clusters (GCs) around the massive elliptical galaxy NGC 1407 out to a projected galactocentric radius of 140 kpc or 17 galaxy effective radii (Re).
On the origin of globular clusters in elliptical and cD galaxies
• Physics
• 1997
Perhaps the most noteworthy of recent findings in extragalactic globular cluster (GC) research are the multimodal GC metallicity distributions seen in massive early-type galaxies. We explore the
Formation of globular cluster systems: from dwarf galaxies to giants
• Physics
Monthly Notices of the Royal Astronomical Society
• 2018
Globular cluster (GC) systems around galaxies of a vast mass range show remarkably simple scaling relations. The combined mass of all GCs is a constant fraction of the total galaxy mass and the mean
Mapping the galaxy NGC 4486 (M87) through its globular cluster system
• Physics
• 2011
As shown in previous works, globular clusters (GCs) can be used to trace the overall structure of the diffuse stellar populations in early-type galaxies if the number of clusters per unit stellar
The difference in metallicity distribution functions of halo stars and globular clusters as a function of galaxy type: A tracer of globular cluster formation and evolution
• Physics
• 2017
Observations of globular clusters (GCs) and field stars in the halos of the giant elliptical galaxy Cen A and the spiral galaxy M31 show a large range of cluster-to-star number ratios ('specific
The Globular Cluster Systems in the Coma Ellipticals. II. Metallicity Distribution and Radial Structure in NGC 4874 and Implications for Galaxy Formation
• Physics
• 2000
Deep Hubble Space Telescope WFPC2 images in V and I are used to investigate the globular cluster system (GCS) in NGC 4874, the central cD galaxy of the Coma cluster. Although the luminosity function
DARK MATTER HALOS IN GALAXIES AND GLOBULAR CLUSTER POPULATIONS
• Physics
• 2014
We combine a new, comprehensive database for globular cluster populations in all types of galaxies with a new calibration of galaxy halo masses based entirely on weak lensing. Correlating these two
Modeling the Metallicity Distribution of Globular Clusters
• Physics
• 2010
Observed metallicities of globular clusters reflect physical conditions in the interstellar medium of their high-redshift host galaxies. Globular cluster systems in most large galaxies display
Globular clusters as the relics of regular star formation in ‘normal’ high-redshift galaxies
We present an end-to-end, two-phase model for the origin of globular clusters (GCs). In the model, populations of stellar clusters form in the high-pressure discs of high-redshift ($z>2$) galaxies (a