The advent of 8m-class telescopes has made galaxies at 1 \mathrel { \hbox { \hbox to 0.0 pt { \hbox { \lower 4.0 pt \hbox { $ \sim$ } } } \hbox { $ < $ } } } z% \mathrel { \hbox { \hbox to 0.0 pt { \hbox { \lower 4.0 pt \hbox { $ \sim$ } } } \hbox { $ < $ } } } 4 relatively easy to detect and study .
This is a brief and incomplete review of some of the recent results to emerge from surveys at these redshifts .
After describing different strategies for finding galaxies at z \mathrel { \hbox { \hbox to 0.0 pt { \hbox { \lower 4.0 pt \hbox { $ \sim$ } } } \hbox { $ > $ } } } 1 , and the differences ( and similarities ) in the resulting galaxy samples , I summarize what is known about the spatial clustering of star-forming galaxies at z \mathrel { \hbox { \hbox to 0.0 pt { \hbox { \lower 4.0 pt \hbox { $ \sim$ } } } \hbox { $ > $ } } } 1 .
Optically selected galaxies are the main focus of this review , but in the final section I discuss the connection between optical and sub-mm samples , and argue that the majority of the 850 \mu m background may have been produced by known optically selected populations at high redshift .
Among the new results presented are the dust-corrected luminosity function of Lyman-break galaxies at z \sim 3 , the estimated contribution to the 850 \mu m background from optically selected galaxies at 1 \mathrel { \hbox { \hbox to 0.0 pt { \hbox { \lower 4.0 pt \hbox { $ \sim$ } } } \hbox { $ < $ } } } z% \mathrel { \hbox { \hbox to 0.0 pt { \hbox { \lower 4.0 pt \hbox { $ \sim$ } } } \hbox { $ < $ } } } 5 , revised estimates of the spatial clustering strength of Lyman-break galaxies at z \sim 3 , and an estimate of the clustering strength of star-forming galaxies at z \simeq 1 derived from a new spectroscopic sample of \sim 800 galaxies with \langle z \rangle = 1.0 , \sigma _ { z } = 0.1 .