Star Formation and Structure Formation at 1 ∼ < Z ∼ < 4

The advent of 8m-class telescopes has made galaxies at 1 ∼ < z ∼ < 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 red-shifts. After describing different strategies for finding galaxies at z ∼ > 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 ∼ > 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 850µm 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 ∼ 3, the estimated contribution to the 850µm background from optically selected galaxies at 1 ∼ < z ∼ < 5, revised estimates of the spatial clustering strength of Lyman-break galaxies at z ∼ 3, and an estimate of the clustering strength of star-forming galaxies at z ≃ 1 derived from a new spectroscopic sample of ∼ 800 galaxies with z = 1.0, σ z = 0.1.