Title：Exploring the Local Universe with re-Constructed Initial Density field (ELUCID) & the real space clustering of galaxies

Speaker：Professor Xiaohu Yang
Unit：Shanghai Jiao Tong University
Time：2016.04.20（Wednesday） 14:30
Place：Physics Building 573, Haiyun Campus, Xiamen University
Abstract：We make use of the galaxy groups and thus constructed mass density field to correct for the redshift distortion effect of galaxies in the Sloan Digital Sky Survey Data Release 7 (SDSS DR7). Detailed clustering analyses using mock galaxy and group catalogues shows that our method can reliably correct for the redshift distortion effects. By applying the method to the SDSS DR7 observation, we constructed a statistically real space galaxy catalogue containing 469332 galaxies within redshift range 0.01 < z < 0.14 in the Northern Galactic Cap of SDSS DR7. We find that the famous Sloan Great Wall, the largest known structure in the Universe, is weakened in real space, indicating that filamentary structures in redshift space may be significantly enhanced due to the Kaiser effect. In addition to the statistical studies, in recent years we have carried out constrained simulations to reproduce the structure formation and evolution in the SDSS DR7 region. These studies are called as ELUCID.