Galaxy Formation and Symbiotic Evolution with the Inter-Galactic Medium in the Age of ELT-ANDES

TL;DR

This paper discusses how the ELT-ANDES spectrograph will revolutionize the study of early galaxy formation, intergalactic medium evolution, and cosmic reionization by enabling observations of extremely faint, high-redshift targets beyond current ground-based capabilities.

Contribution

It introduces the capabilities of the upcoming ELT-ANDES spectrograph and its potential to advance extragalactic research, especially in observing the early Universe and first-generation star products.

Findings

Enhanced ability to detect faint high-redshift systems.

Improved spectral resolution for studying early cosmic epochs.

Synergistic use with other facilities in the 2030s.

Abstract

High-resolution absorption spectroscopy toward bright background sources has had a paramount role in understanding early galaxy formation, the evolution of the intergalactic medium and the reionisation of the Universe. However, these studies are now approaching the boundaries of what can be achieved at ground-based 8-10m class telescopes. The identification of primeval systems at the highest redshifts, within the reionisation epoch and even into the dark ages, and of the products of the first generation of stars and the chemical enrichment of the early Universe, requires observing very faint targets with a signal-to-noise ratio high enough to detect very faint spectral signatures. In this paper, we describe the giant leap forward that will be enabled by ANDES, the high-resolution spectrograph for the ELT, in these key science fields, together with a brief, non-exhaustive overview of other extragalactic research topics that will be pursued by this instrument, and its synergistic use with other facilities that will become available in the early 2030s.