A

David

Darling

Malmquist effect

The Malmquist effect is a statistical bias that has to be taken into account in surveys of galaxies and other remote objects. It arises because as the distance to a collection of objects increases, so does the tendency to see only see the brighter objects present, thus giving a false impression of average brightness with distance. The effect is name after the Swedish astronomer Karl Malmquist (1893–1982).