Beyond the brim, Sombrero Galaxy's halo suggests turbulent past
Thursday, February 20, 2020 - 14:10
in Astronomy & Space
These latest Hubble observations of the Sombrero galaxy indicate only a tiny fraction of older, metal-poor stars in the halo, plus an unexpected abundance of metal-rich stars. Past major galaxy mergers are a possible explanation, though the stately Sombrero shows none of the messy evidence of a recent merger of massive galaxies.