S315p.287 — Witnessing Gas Mixing in the Metal Distribution during a Galaxy Merger.

Date & Time

Aug 4th at 6:00 PM until 6:00 PM




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Author(s): Philippe Amram1

Institution(s): 1. Laboratoire d'Astrophysique de Marseille

I will present direct evidence that in a merger of disk galaxies, the pre-existing central metallicities will mix as a result of gas being transported in the merger interface region along the line that joins the two coalescing nuclei. In focusing on the emission line gas, this is shown using detailed two-dimensional kinematics as well as metallicity measurements for the nearby ongoing merger in the center of the compact group HCG 31. The two coalescing cores display similar oxygen abundances, while in between the two nuclei, the metallicity changes smoothly from one nucleus to the other indicating a mix of metals in this region. This nearby system involves the merging of two fairly low-mass and clumpy galaxies (LMC-like galaxies), making it an important system for comparison with high-redshift galaxies.