Constraining the Nature of Star Formation at High Redshift

Kyoung-Soo Lee

Our improved understanding of dark-matter halo statistics can be effectively used to extract useful physical information directly from the observed galaxy statistics commonly measured from large galaxy surveys, such as luminosity function and clustering properties (luminosity-dependent trend and overall shape) of galaxies. I will discuss a simple formalism to constrain the scaling laws between UV luminosity and halo mass (local gravity), and the typical duration of star-formation at z~4 and 5. From these results, possible dominant mechanisms responsible for star-formation activity in the majority of galaxies (L<L*) are discussed.