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Chandra Cluster Cosmology Project III: Cosmological Parameter Constraints
A. Vikhlinin, A. V. Kravtsov, R. A. Burenin +8
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. St…
Chandra Cluster Cosmology Project II: Samples and X-ray Data Reduction
A. Vikhlinin, R. A. Burenin, H. Ebeling +8
We discuss the measurements of the galaxy cluster mass functions at z=~0.05 and z=~0.5 using high-quality Chandra observations of samples derived from the ROSAT PSPC All-Sky and 40…
The Cluster-Merger Shock in 1E 0657-56
Jun Koda, Milos Milosavljevic, Paul R. Shapiro +2
The merging galaxy cluster 1E 0657-56, known as the "bullet cluster," is one of the hottest clusters known. The X-ray emitting plasma exhibits bow-shock-like temperature and densit…
Scaling Relations from Sunyaev-Zel'dovich Effect and Chandra X-ray measurements of high-redshift galaxy clusters
Massimiliano Bonamente, Marshall Joy, Samuel LaRoque +3
We present Sunyaev-Zel'dovich Effect (SZE) scaling relations for 38 massive galaxy clusters at redshifts 0.14<z0.89, observed with both the Cchandra X-ray Observatory and the centi…
Cluster Merger Shock Constraints on Particle Acceleration and Nonthermal Pressure in the Intracluster Medium
Ehud Nakar, Milos Milosavljevic, Daisuke Nagai
X-ray observations of galaxy cluster merger shocks can be used to constrain nonthermal processes in the intracluster medium (ICM). The presence of nonthermal pressure components in…
Gamma-ray probe of cosmic-ray pressure in galaxy clusters and cosmological implications
Shin'ichiro Ando, Daisuke Nagai
Cosmic rays produced in cluster accretion and merger shocks provide pressure to the intracluster medium (ICM) and affect the mass estimates of galaxy clusters. Although direct evid…
The Cluster-Merger Shock in 1E 0657-56: Faster than the Speeding Bullet?
Milos Milosavljevic, Jun Koda, Daisuke Nagai +2
Shock waves driven in the intergalactic medium during the merging of galaxy clusters have been observed in X-ray imaging and spectroscopy. Fluid motions inferred from the shock str…
Missing Thermal Energy of the Intracluster Medium
Niayesh Afshordi, Yen-Ting Lin, Daisuke Nagai +1
The Sunyaev-Zel'dovich (SZ) effect is a direct probe of thermal energy content of the Universe, induced in the cosmic microwave background (CMB) sky through scattering of CMB photo…
Modeling Chandra X-ray observations of Galaxy Clusters using Cosmological Simulations
Daisuke Nagai, Andrey V. Kravtsov, Alexey Vikhlinin
X-ray observations of galaxy clusters potentially provide powerful cosmological probes if systematics due to our incomplete knowledge of the intracluster medium (ICM) physics are u…
X-ray and Sunyaev-Zel'dovich Effect Measurements of the Gas Mass Fraction in Galaxy Clusters
S. LaRoque, M. Bonamente, J. Carlstrom +4
We present gas mass fractions of 38 massive galaxy clusters spanning redshifts from 0.14 to 0.89, derived from Chandra X-ray data and OVRO/BIMA interferometric Sunyaev-Zel'dovich E…
Supersonic Motions of Galaxies in Clusters
Andreas Faltenbacher, Andrey V. Kravtsov, Daisuke Nagai +1
We study motions of galaxies in galaxy clusters formed in the concordance LCDM cosmology. We use high-resolution cosmological simulations that follow dynamics of dark matter and ga…
Simulating the Formation of Galaxy Clusters
Daisuke Nagai, Andrey V. Kravtsov
We study the effects of radiative cooling, star formation and stellar feedback on the properties and evolution of galaxy clusters using high-resolution Adaptive Mesh Refinement N-b…
Effect of Internal Flows on Sunyaev-Zeldovich Measurements of Cluster Peculiar Velocities
Daisuke Nagai, Andrey V. Kravtsov, Arthur Kosowsky
Galaxy clusters are potentially powerful probes of the large-scale velocity field in the Universe because their peculiar velocity can be estimated directly via the kinematic Sunyae…
Cold Fronts in CDM clusters
Daisuke Nagai, Andrey V. Kravtsov
Recently, high-resolution Chandra observations revealed the existence of very sharp features in the X-ray surface brightness and temperature maps of several clusters (Vikhlinin et.…
Measurement of Arcminute Scale Anisotropy with the BIMA Array
K. S. Dawson, W. L. Holzapfel, J. E. Carlstrom +4
We report the results of our continued study of arcminute scale anisotropy in the Cosmic Microwave Background (CMB) with the Berkeley-Illinois-Maryland Array. The survey consists o…
Sunyaev-Zel'dovich Effect Imaging of Massive Clusters of Galaxies at Redshift z > 0.8
Marshall Joy, Samuel LaRoque, Laura Grego +6
We present Sunyaev-Zel'dovich Effect (SZE) imaging observations of three distant (z > 0.8) and highly X-ray luminous clusters of galaxies, Cl1226+33, Cl0152-13 and MS1054-03. Two o…
A Multiphase Model for the Intracluster Medium
D. Nagai, M. E. Sulkanen, A. E. Evrard
Constraints on the clustered mass density Ω_m of the universe derived from the mean intracluster gas fraction of X-ray clusters may be biased by a single-phase assumption for the t…