Galaxy Clustering and Large‐Scale Structure from \documentclass{aastex} \usepackage{amsbsy} \usepackage{amsfonts} \usepackage{amssymb} \usepackage{bm} \usepackage{mathrsfs} \usepackage{pifont} \usepackage{stmaryrd} \usepackage{textcomp} \usepackage{portland,xspace} \usepackage{amsmath,amsxtra} \usepackage[OT2,OT1]{fontenc} \newcommand\cyr{ \renewcommand\rmdefault{wncyr} \renewcommand\sfdefault{wncyss} \renewcommand\encodingdefault{OT2} \normalfont \selectfont} \DeclareTextFontCommand{\textcyr…

(abridged) We present a study of the nature and evolution of large-scalestructure based on two independent redshift surveys of faint field galaxiesconducted with the 176-fiber Norris Spectrograph on the Palomar 200-inchtelescope. The two surveys together sparsely cover ~20 sq. degrees and contain835 r < 21 mag galaxies with redshifts 0.2 < z < 0.5. Both surveys have amedian redshift of z = 0.30. In order to obtain a rough estimate of the cosmicvariance, we analyze the two surveys independently. We measure the comovingcorrelation length to be 3.70 +/- 0.13 h^-1 Mpc at z = 0.30 with a power-lawslope gamma = 1.77 +/- 0.05. Dividing the sample into low (0.2 < z < 0.3) andhigh (0.32 < z < 0.5) redshift intervals, we see no evidence for a change inthe comoving correlation length over the redshift range 0.2 < z < 0.5. Similarto the well-established results in the local universe, we find thatintrinsically bright galaxies are more strongly clustered than intrinsicallyfaint galaxies and that galaxies with little ongoing star formation, as judgedfrom the rest-frame equivalent width of the [OII]3727, are more stronglyclustered than galaxies with significant ongoing star formation. The rest-framepairwise velocity dispersion of the sample is 326^+67_-52 km s^-1, ~25% lowerthan typical values measured locally. The appearance of the galaxydistribution, particularly in the more densely sampled Abell 104 field, isquite striking. The pattern of sheets and voids which has been observed locallycontinues at least to z ~ 0.5. A friends-of-friends analysis of the galaxydistribution supports the visual impression that > 90% of all galaxies at z <0.5 are part of larger structures with overdensities of > 5.Comment: 40 pages including 26 Postscript figures; revised version to match version accepted by Ap