![]() According to our current understanding, the structure of matter evolves from small density fluctuations in the early Universe to build up the present-day distribution of matter. Large-scale underdensities naturally arise as the result of structure growth. Methods: statistical, cosmology: observations, large-scale structure of Universe 1 INTRODUCTION These results are obtained from the SDSS spectroscopic galaxy catalogue and also from semi-analytic mock galaxy catalogues, thus supporting the viability of the standard Λcold dark matter model to reproduce large-scale structure and dynamics. By applying this technique to real data, we confirm the twofold nature of void dynamics: large voids typically are in an expansion phase whereas small voids tend to be surrounded by overdense and collapsing regions. We show that this model can be used to successfully recover the underlying velocity and density profiles of voids from redshift space samples. Based on the linear approach of gravitational collapse theory we developed a parametric model of the void–galaxy redshift space cross-correlation function. We analyse the distortions on the cross-correlation isodensity levels and find anisotropic isocontours consistent with expansion for large voids with smoothly rising density profiles and collapse for small voids with overdense shells surrounding them. ![]() We compute the void–galaxy cross-correlation function in the Sloan Digital Sky Survey (SDSS) in terms of distances taken along the line of sight and projected into the sky. Hayes, Matthew Schaerer, Daniel Oestlin, Goeran Mas-Hesse, J.Using the redshift space distortions of void–galaxy cross-correlation function we analyse the dynamics of voids embedded in different environments. International Nuclear Information System (INIS) ON THE REDSHIFT EVOLUTION OF THE Lyα ESCAPE FRACTION AND THE DUST CONTENT OF GALAXIES Keck Foundation.Ī SUCCESSFUL BROADBAND SURVEY FOR GIANT Ly nebula, which we suggest may be the limb of a dusty shell, related to the large-scale H I absorbers often associated with high-z radio galaxies. The Observatory was made possible by the generous financial support of the W. Keck Observatory, which is operated as a scientific partnership among the California Institute of Technology, the University of California, and the National Aeronautics and Space Administration. Data presented herein were obtained at the W. When combined with the results of other surveys, limited at higher luminosities, our results suggest evidence for the suppression of star formation in low-mass halos, as predicted in popular models of galaxy formation. Our cumulative z~=5 Lyα luminosity function is consistent with a power-law form n(>L)~L-1 over 1041-1042.5 ergs s-1. By virtue of the strong magnification factor, we provide constraints on the Lyα luminosity function to unprecedented limits of 1040 ergs s -1, corresponding to a star formation rate of 0.01 Msolar yr-1. We observed carefully selected regions near nine clusters, consistent with magnification factors generally greater than 10 for the redshift range 4.5account our varying intrinsic Lyα line sensitivity as a function of wavelength and sky position. We derive the luminosity function of high- redshift Lyα-emitting sources from a deep, blind, spectroscopic survey that utilized strong-lensing magnification by intermediate- redshift clusters of galaxies. Kneib, Jean-Paul Richard, Johan Kuijken, Konrad ![]() ![]() The Abundance of Low-Luminosity Lyα Emitters at High Redshift ![]()
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