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Environmental effects in the interaction and merging of galaxies in zCOSMOS
P. Kampczyk, S. J. Lilly, L. de Ravel +56
(Abridged) We analyze the environments and galactic properties (morphologies and star-formation histories) of a sample of 153 close kinematic pairs in the redshift range 0.2 < z <…
A Detection of Weak Lensing Magnification using Galaxy Sizes and Magnitudes
Fabian Schmidt, Alexie Leauthaud, Richard Massey +5
Weak lensing is commonly measured using shear through galaxy ellipticities, or using the effect of magnification bias on galaxy number densities. Here, we report on the first detec…
Measuring the Geometry of the Universe from Weak Gravitational Lensing behind Galaxy Groups in the HST COSMOS survey
James E. Taylor, Richard J. Massey, Alexie Leauthaud +12
Gravitational lensing can provide pure geometric tests of the structure of space-time, for instance by determining empirically the angular diameter distance-redshift relation. This…
Magnification by Galaxy Group Dark Matter Halos
Jes Ford, Hendrik Hildebrandt, Ludovic Van Waerbeke +6
We report on the detection of gravitational lensing magnification by a population of galaxy groups, at a significance level of 4.9 sigma. Using X-ray selected groups in the COSMOS…
Galaxies in X-ray Groups I: Robust Membership Assignment and the Impact of Group Environments on Quenching
Matthew R. George, Alexie Leauthaud, Kevin Bundy +19
Understanding the mechanisms that lead dense environments to host galaxies with redder colors, more spheroidal morphologies, and lower star formation rates than field populations r…
The integrated stellar content of dark matter halos
Alexie Leauthaud, Matthew R. George, Peter S. Behroozi +6
Measurements of the total amount of stars locked up in galaxies as a function of host halo mass contain key clues about the efficiency of processes that regulate star formation. We…