PIRSA:12100041

Video URL

https://pirsa.org/12100041

Voids in the SDSS: from demography to cosmology

Sutter, P. (2012). Voids in the SDSS: from demography to cosmology. Perimeter Institute for Theoretical Physics. https://pirsa.org/12100041

Sutter, Paul. Voids in the SDSS: from demography to cosmology. Perimeter Institute for Theoretical Physics, Oct. 09, 2012, https://pirsa.org/12100041 

          @misc{ scivideos_PIRSA:12100041,
            doi = {10.48660/12100041},
            url = {https://pirsa.org/12100041},
            author = {Sutter, Paul},
            keywords = {Cosmology},
            language = {en},
            title = {Voids in the SDSS: from demography to cosmology},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2012},
            month = {oct},
            note = {PIRSA:12100041 see, \url{https://scivideos.org/index.php/pirsa/12100041}}
          }

Paul Sutter Institut d'Astrophysique de Paris

Talk numberPIRSA:12100041
DOI10.48660/12100041
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

Abstract

Cosmic voids are potentially a rich source of information for both astrophysics and cosmology. To enable such science, we produce the most comprehensive void catalog to date using the Sloan Digital Sky Survey Data Release 7 main sample out to redshift z = 0.2 and the Luminous Red Galaxy sample out to z = 0.44. Using a modified version of the parameter-free void finder ZOBOV, we fully take into account the presence of survey boundary and masks. We discuss basic catalog statistics such as number counts and redshift distributions, as well as describe some example data products derived from our catalog, such as radial density profiles and projected density maps. Using this catalog, we report on the first application of the Alcock-Paczynski test to stacked voids in spectroscopic redshift surveys by applying the shape-fitting procedure presented in Lavaux & Wandelt (2011) to ten void stacks out to redshift z = 0.36. Our results are consistent with WMAP 7-year cosmological constraints. We compare our results to alternate methods of constructing void stacks and comment on future observational prospects.