Modelling galaxy–galaxy weak lensing with Sloan Digital Sky Survey groups |
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Authors: | Ran Li H. J. Mo Zuhui Fan Marcello Cacciato Frank C. van den Bosch Xiaohu Yang Surhud More |
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Affiliation: | Department of Astronomy, Peking University, Beijing 100871, China;Department of Astronomy, University of Massachusetts, Amherst MA 01003, USA;Max-Planck Institute for Astronomy, Königstuhl 17, D-69117 Heidelberg, Germany;Shanghai Astronomical Observatory, the Partner Group of MPA, Nandan Road 80, Shanghai 200030, China |
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Abstract: | We use galaxy groups selected from the Sloan Digital Sky Survey (SDSS) together with mass models for individual groups to study the galaxy–galaxy lensing signals expected from galaxies of different luminosities and morphological types. We compare our model predictions with the observational results obtained from the SDSS by Mandelbaum et al. for the same samples of galaxies. The observational results are well reproduced in a Λ cold dark matter (ΛCDM) model based on the Wilkinson Microwave Anisotropy Probe ( WMAP ) 3-yr data, but a ΛCDM model with higher σ8, such as the one based on the WMAP 1-yr data, significantly overpredicts the galaxy–galaxy lensing signal. We model, separately, the contributions to the galaxy–galaxy lensing signals from different galaxies: central versus satellite, early type versus late type and galaxies in haloes of different masses. We also examine how the predicted galaxy–galaxy lensing signal depends on the shape, density profile and the location of the central galaxy with respect to its host halo. |
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Keywords: | methods: statistical galaxies: haloes dark matter large-scale structure of Universe |
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