Astro2020 Science White Paper: Local Dwarf Galaxy Archaeology

TL;DR

This white paper discusses how studying nearby dwarf galaxies through detailed stellar spectroscopy can reveal insights into early universe star formation, galaxy evolution, and elemental origins, requiring advanced telescopes.

Contribution

It highlights the importance of high-resolution spectroscopy of dwarf galaxies for understanding the universe's first stars and galaxy formation in small dark matter halos.

Findings

Resolved stellar spectroscopy reveals signatures of early star formation.

Large telescopes are essential for studying faint dwarf galaxies.

Insights into the first stellar explosions and elemental origins.

Abstract

Nearby dwarf galaxies are local analogues of high-redshift and metal-poor stellar populations. Most of these systems ceased star formation long ago, but they retain signatures of their past that can be unraveled by detailed study of their resolved stars. Archaeological examination of dwarf galaxies with resolved stellar spectroscopy provides key insights into the first stars and galaxies, galaxy formation in the smallest dark matter halos, stellar populations in the metal-free and metal-poor universe, the nature of the first stellar explosions, and the origin of the elements. Extremely large telescopes with multi-object R=5,000-30,000 spectroscopy are needed to enable such studies for galaxies of different luminosities throughout the Local Group.