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 challenging. Using the DEep Imaging Multi-Object Spectrograph on the Keck, we have been able to measure the metallicities of the stellar and globular cluster components in 12 early-type galaxies out to more than 10Re.
Cone search capability for table J/MNRAS/451/2625/table1 (Galaxy parameters)
Cone search capability for table J/MNRAS/451/2625/table2 (Ca Triplet measurements and metallicities in the globular clusters of 12 galaxies)