# Integrated Spectroscopy of Extragalactic Globular Clusters

## TL;DR

This paper reviews how integrated light spectroscopy of extragalactic globular clusters reveals their chemical compositions and informs galaxy formation history, highlighting recent advances and future prospects.

## Contribution

It synthesizes current knowledge on IL spectroscopy of GCs, emphasizing metallicity, chemical abundances, and the impact of multiple populations in extragalactic contexts.

## Key findings

- IL spectroscopy determines metallicities and chemical abundances of GCs.
- Observations of distant GCs constrain light-element abundance variations.
- IL spectroscopy bridges Galactic and extragalactic stellar population studies.

## Abstract

Integrated light (IL) spectroscopy enables studies of stellar populations beyond the Milky Way and its nearest satellites. In this paper, I will review how IL spectroscopy reveals essential information about globular clusters and the assembly histories of their host galaxies, concentrating particularly on the metallicities and detailed chemical abundances of the GCs in M31. I will also briefly mention the effects of multiple populations on IL spectra, and how observations of distant globular clusters help constrain the source(s) of light-element abundance variations. I will end with future perspectives, emphasizing how IL spectroscopy can bridge the gap between Galactic and extragalactic astronomy.