Galaxy Environment: Difference between revisions
(Summary of Galaxy Environment) |
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The environment of a galaxy is a key factor in determining the evolution of galaxies. | The environment of a galaxy is a key factor in determining the evolution of galaxies. This can be measured in a number of ways | ||
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- Galaxy number counts; if the comoving number density of galaxies | - Galaxy number counts; if the comoving number density of galaxies | ||
- Galaxy-galaxy clustering; | - Galaxy-galaxy clustering; measuring the correlation function/power spectrum of galaxies, often in angular space | ||
- Galaxy-galaxy lensing; | - Galaxy-galaxy lensing; measure the correlation between galaxies and the shear on background galaxies from gravitational lensing | ||
Typically | |||
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Revision as of 13:58, 18 November 2020
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