Daisuke Nagai

TL;DR: In this article, Chandra observations of large samples of galaxy clusters detected in X-rays by ROSAT provide a new, robust determination of the cluster mass functions at low and high redshifts.

TL;DR: In this article, the effects of cooling of gas in the inner regions of halos using high-resolution cosmological simulations that include gas dynamics, radiative cooling, and star formation were investigated.

TL;DR: In this paper, the evolution of the galaxy cluster mass functions at z 0.05 and z0.5 using high-quality Chandra observations of samples derived from the ROSAT PSPC All-Sky and 400 deg2 surveys is discussed.

TL;DR: In this article, the authors compared the ICM properties outside cluster cores with the observed X-ray observations of nearby relaxed clusters to assess the impact of galaxy formation, and found that the observed ICM characteristics outside cluster core are well reproduced in the simulations that include cooling and star formation, while the non-radiative simulations predict an overall shape of ICM profiles inconsistent with observations.

TL;DR: In this article, the authors present mock Chandra analyses of cosmological cluster simulations and assess X-ray measurements of galaxy cluster properties using a model and procedure essentially identical to that used in real data analysis, and show that reconstruction of three-dimensional ICM density and temperature profiles is excellent for relaxed clusters, but still reasonably accurate for unrelaxed systems.