Michael S Vogeley

Wide-angle, moderately deep redshift surveys such as that conducted as part of the Sloan Digital Sky Survey (SDSS) allow study of the relationship between the structural elements of the large-scale distribution of galaxies – including groups, cluster, superclusters, and voids – and the dependence of galaxy formation and evolution on these enviroments. We present a progress report on mapping efforts with the SDSS and discuss recently constructed catalogs of clusters, voids, and void galaxies, and evidence for a 420h−1Mpc supercluster or "Great Wall." Analysis of multi-band photometry and moderate-resolution spectroscopy from the SDSS reveals environmental dependence of the star formation history of galaxies that extends over more than a factor of 100 in density, from clusters all the way to the deep interiors of voids. On average, galaxies in the rarified environments of voids exhibit bluer colors, higher specific star formation rates, lower dust content, and more disk-like morphology than objects in denser regions. This trend persists in comparisons of samples in low vs. high-density regions with similar luminosity and morphology, thus this dependence is not simply an extension of the morphology-density relation. Large-scale modulation of the halo mass function and the temperature of the intergalactic medium might explain this dependence of galaxy evolution on the large-scale environment.

As part of an ongoing and ambitious project to support scientific discoveries in astronomy, in particular based on the use of Sloan Digital Sky Survey data, this article addresses a number of practical issues concerning the analysis of the impact of such large-scale survey datasets on scientific discoveries in terms of trends and patterns in scientific publications that utilize the data. We take a multi-perspective approach to the analysis of the SDSS literature, namely a statistical perspective, a network analysis perspective, and a text analysis perspective. This study reveals practical issues that have theoretical and methodological implications on the applications of scientometrics and bibliometrics on astronomical literature.