Open Access

Table 2.

Age, metallicity, and [α/Fe] of the stacked GC spectra.

Population Age (Gyr) [M/H] [α/Fe]
All 13.89 ± 0.40 0.15 ± 0.02 0.17 ± 0.03
Inner 13.93 ± 0.40 0.19 ± 0.03 0.12 ± 0.03
Outer 13.86 ± 0.60 0.12 ± 0.04 0.18 ± 0.04
2 innermost 13.56 ± 1.24 0.21 ± 0.04 0.26 ± 0.06

Notes. These mass-weighted properties were determined for the stacked spectrum for all, only inner, only outer, and only the two innermost GCs of NGC 3311 through an unregularized pPXF fit, while uncertainties were estimated through a statistical Monte Carlo approach.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.