Galaxy-galaxy lensing constraints on the relation between baryons and dark matter in galaxies in the Red Sequence Cluster Survey 2

Journal article

We present the results of a study of weak gravitational lensing by galaxies using imaging data that were obtained as part of the second Red Sequence Cluster Survey (RCS2). In order to compare to the baryonic properties of the lenses we focus here on the ~300 square degrees that overlap with the DR7 of the SDSS. The depth and image quality of the RCS2 enables us to significantly improve upon earlier work for luminous galaxies at z>=0.3. Comparison with dynamical masses from the SDSS shows a good correlation with the lensing mass for early-type galaxies. For low luminosity (stellar mass) early-type galaxies we find a satellite fraction of ~40% which rapidly decreases to <10% with increasing luminosity (stellar mass). The satellite fraction of the late-types has a value in the range 0-15%. We find that early-types in the range 10^10

Authors: Uitert, E; Hoekstra, H; Velander, M; Gilbank, D; Gladders, MD

• Publication status: Published
• Journal: ASTRONOMY and ASTROPHYSICS
• Volume: 534
• Pages: A14-A14
• Publication date: 2011-07-20
• DOI: 10.1051/0004-6361/201117308
• EISSN: 1432-0746
• ISSN: 0004-6361
• Language: English
• Keywords: astro-ph.CO