The authors of this analysis use the largest, high-resolution cosmological N-body simulation to date, the Millennium-XXL, to investigate sources of scatter in cluster scaling relations. They find that a wide range of biases can affect the most commonly used scaling relations.
Researchers at Caltech have used data from the Keck Baryonic Structure Survey to place quantitative constraints on the circumgalactic medium around galaxies at z~2. Measurements like these help us fine-tune our understanding of the interplay between gas and galaxies and, ultimately, galaxy formation and evolution.
The South Pole Telescope collaboration detects the effects of gravitational lensing on the cosmic microwave background and derives improved constraints on several cosmological parameters.
In this series of papers, the authors apply new analysis techniques to data from several galaxy redshift surveys to uncover acoustic waves from the early universe and refine measurements of cosmological parameters.
Estimating galaxy cluster masses is difficult, but it might be getting more precise thanks to the Sunyaev-Zeldovich effect.
Simulations tell us of a web-like Universe but it’s hard to explore this topic observationally because we can’t see dark matter. But the Canada-France-Hawaii Telescope (CFHT) Lensing Survey has made the first large scale map of dark matter. On the first day of AAS #219, the CFHTLenS survey shared their results with us.a