A multiple burst accretion Model to describe the metallicity distributions and stellar mass-metallicity relation for Local Dwarf Galaxies

TL;DR

This paper introduces a one-parameter multiple-burst accretion model that explains the metallicity distributions and mass-metallicity relation in local dwarf galaxies, aligning with recent observational constraints.

Contribution

It presents a novel accretion-based model that accounts for observed metallicity relations and star formation scenarios in dwarf galaxies with a single parameter.

Findings

Model fits observed metallicity distributions.

Predicts a mass-metallicity relation consistent with observations.

Supports star formation in gas-rich mergers or colliding streams.

Abstract

A one parameter model to describe the individual metallicity distributions and stellar mass-metallicity relation for dwarf galaxies is presented. This multiple-burst model is based on an accretion scenario, accomodates the observational constraint between $\overline{z}$ and $\sigma_{z}^{2}$ recently established by Leaman (2012), and predicts a slope consistent with the stellar mass-metallicity relation of Kirby et al (2013) who showed that the local group dwarf spheroidal and dwarf irregular galaxies lie on the same relation. One interpretation of the model is that it describes star formation occuring either in gas rich mergers or at the intersection of colliding gas streams.