Rings of star formation: Imprints of a close galaxy encounter

TL;DR

This paper discusses how galaxy merger simulations reveal that close galaxy encounters often produce rings of star formation, which can serve as indicators of past interactions, especially when disc spins are aligned.

Contribution

It introduces the novel finding that star formation rings are a common feature of galaxy interactions with aligned spins, aiding in identifying close galaxy pairs.

Findings

Star formation rings are produced by close galaxy encounters.

Aligned disc spins are crucial for the formation of these rings.

This signature helps identify galaxies that have undergone close interactions.

Abstract

In this talk, I report results from galaxy merger simulations, which suggest the existence of a ring of star formation produced by close galaxy encounters. This is a generic feature of all galaxy interactions, provided that the disc spins are sufficiently aligned. This signature can be used to identify close galaxy pairs that have actually suffered a close interaction.