Journal Article

Modelling galaxy–galaxy weak lensing with Sloan Digital Sky Survey groups

Ran Li, H. J. Mo, Zuhui Fan, Marcello Cacciato, Frank C. Van Den Bosch, Xiaohu Yang and Surhud More

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 394, issue 2, pages 1016-1030
Published in print April 2009 | ISSN: 0035-8711
Published online March 2009 | e-ISSN: 1365-2966 | DOI:
Modelling galaxy–galaxy weak lensing with Sloan Digital Sky Survey groups

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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.

Keywords: methods: statistical; galaxies: haloes; dark matter; large-scale structure of Universe

Journal Article.  11012 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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