Gravitationally Lensed Galaxy Number Counts i the infrared I: Concept

摘要

Gravitational lensing effect on infrared number counts is a useful tool for the study of galaxy evolution at high redshift. In contrast to the case of optical number counts, far infrared number counts are enhanced by the existence of gravitational lens. We introduce the concept of the magnification bias and then ofrmulate the gravitationally lensed number count of infrared galaxies. Then we show the possibility of utilizing the lensed number counts of the infrared galaxies as a tool for the study of galaxy evolution.