# 4MOST Consortium Survey 7: Wide-Area VISTA Extragalactic Survey (WAVES)

## TL;DR

WAVES is a comprehensive survey that studies the growth of cosmic structures and galaxy evolution over 7 billion years, providing a large dataset to test cosmological models and galaxy formation theories.

## Contribution

It offers a large, multi-scale dataset linking low and intermediate redshift galaxies, enabling detailed analysis of structure formation and galaxy evolution.

## Key findings

- Mapping large-scale structures like filaments and voids.
- Measuring galaxy group mass and merger rates.
- Analyzing galaxy size and mass evolution.

## Abstract

WAVES is designed to study the growth of structure, mass and energy on scales of ~1 kpc to ~10 Mpc over a 7 Gyr timeline. On the largest length scales (1-10 Mpc) WAVES will measure the structures defined by groups, filaments and voids, and their emergence over recent times. Comparisons with bespoke numerical simulations will be used to confirm, refine or refute the Cold Dark Matter paradigm. At intermediate length scales (10 kpc-1 Mpc) WAVES will probe the size and mass distribution of galaxy groups, as well as the galaxy merger rates, in order to directly measure the assembly of dark matter halos and stellar mass. On the smallest length scales (1-10 kpc) WAVES will provide accurate distance and environmental measurements to complement high-resolution space-based imaging to study the mass and size evolution of galaxy bulges, discs and bars. In total, WAVES will provide a panchromatic legacy dataset of ~1.6 million galaxies, firmly linking the very low ($z < 0.1$) and intermediate ($z \sim 0.8$) redshift Universe.

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Source: https://tomesphere.com/paper/1903.02473