Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 427, Issue 1, Pages L6-L10Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1745-3933.2012.01326.x
Keywords
gravitation; galaxies: groups: general; galaxies: haloes; dark matter
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Funding
- Consejo de Investigaciones Cientificas y Tecnicas de la Republica Argentina (CONICET)
- SeCyT-UNC
- Alfred P. Sloan Foundation
- National Science Foundation
- US Department of Energy
- National Aeronautics and Space Administration
- Japanese Monbukagakusho
- Max Planck Society
- Higher Education Funding Council for England
- American Museum of Natural History
- Astrophysical Institute Potsdam, University of Base
- University of Cambridge
- Case Western Reserve University
- University of Chicago
- Drexel University
- Fermilab
- Institute for Advanced Study
- Japan Participation Group
- Johns Hopkins University
- Joint Institute for Nuclear Astrophysics
- Kavli Institute for Particle Astrophysics and Cosmology
- Korean Scientist Group
- Chinese Academy of Sciences (LAMOST)
- Los Alamos National Laboratory
- Max Planck Institute for Astronomy (MPIA)
- Max Planck Institute for Astrophysics (MPA), New Mexico State University
- Ohio State University
- University of Pittsburgh
- University of Portsmouth
- Princeton University
- United States Naval Observatory
- University of Washington
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We introduce a new method for the identification of galaxy systems in redshift surveys based on the halo model. This method is a modified version of the K-means identification algorithm developed by Yang et al. We have calibrated and tested our algorithms using mock catalogues generated using the Millennium Simulations and applied them to the NYU-DR7 galaxy catalogue (based on the SDSS data sets). Using this local sample of groups and clusters of galaxies, we have measured the effect of gravitational redshift produced by their host dark matter haloes. Our results show radial velocity decrements consistent with general relativity predictions and previous measurements by Wojtak et al. in clusters of galaxies.
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