# Star Formation Efficiency in Low Surface Brightness Regions

## TL;DR

This paper reviews the environments of low surface brightness regions across various galaxy types, focusing on their gas content and star formation efficiency, and discusses possible explanations for their low efficiency compared to disk galaxies.

## Contribution

It provides a comprehensive overview of low surface brightness regions' gas properties and star formation efficiency, proposing interpretations for their low efficiency.

## Key findings

- Low surface brightness regions have significant gas but low star formation efficiency.
- Star formation efficiency varies across different low surface brightness environments.
- Proposed explanations include environmental effects and gas properties affecting star formation.

## Abstract

Low surface brightness regions are found not only in dwarf and ultra-diffuse galaxies, but also on the outer parts of giant spirals, or in galaxy extensions (tidal or ram-pressure tails, outflows or jets). Sometimes molecular gas is detected in sufficient quantities to allow star formation, but the efficiency is much lower than in disk galaxies. This presentation reviews different environments showing low-surface brightness, their gas content and surface densities, and their star formation efficiency. Some interpretations are proposed to account for this low efficiency.