Galaxy Environment

The environment of a galaxy is a key factor in determining the evolution of galaxies. This can be measured in a number of ways

One key is the galaxy-halo connection; how the dark matter halo that a galaxy is in affects its evolution.

Typically this requires assuming some knowledge of the underlying dark matter distribution, and then measuring some properties of the galaxy population and constraining what the relationship could be.

This can be probed in a number of ways:

- Galaxy number counts; if the comoving number density of galaxies

- Galaxy-galaxy clustering; measuring the correlation function/power spectrum of galaxies, often in angular space

- Galaxy-galaxy lensing; measure the correlation between galaxies and the shear on background galaxies from gravitational lensing

Typically

Work by Group Members in this Area