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The X-ray properties of a relaxed cluster of galaxies are determined primarily by its gravitational potential well and the entropy distribution of its intracluster gas. That entropy distribution reflects both the accretion history of the…

Astrophysics · Physics 2009-11-13 Megan Donahue , Donald J. Horner , Kenneth W. Cavagnolo , G. Mark Voit

We use gas-dynamical simulations of galaxy clusters to compare their X-ray and strong lensing properties. Special emphasis is laid on mass estimates. The cluster masses range between 6 x 10^14 solar masses and 4 x 10^15 solar masses, and…

Astrophysics · Physics 2015-06-24 Matthias Bartelmann , Matthias Steinmetz

Forthcoming measurements of the Sunyaev-Zeldovich (SZ) effect in galaxy clusters will dramatically improve our understanding of the main intra-cluster medium (ICM) properties and how they depend on the particular thermal and dynamical state…

Cosmology and Nongalactic Astrophysics · Physics 2025-03-14 Óscar Monllor-Berbegal , David Vallés-Pérez , Susana Planelles , Vicent Quilis

Measurements of the Hubble constant to distant galaxy clusters using the Sunyaev-Zeldovich effect are systematically low in comparison to values obtained by other means. These measurements usually assume a spherical isothermal $\beta$ model…

Astrophysics · Physics 2007-05-23 Wen-Ching Lin , Michael L. Norman , Greg L. Bryan

I review some important aspects of the structural and statistical properties of the nearby X-ray galaxy cluster population, discussing the new constraints on mass profiles, the mass-temperature relation, and the entropy of the intracluster…

Astrophysics · Physics 2007-05-23 G. W. Pratt

We investigate the internal structure of clusters of galaxies in high-resolution N-body simulations of 4 different cosmologies. There is a higher proportion of disordered clusters in critical-density than in low-density universes, although…

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 understood and controlled. In this paper, we present mock…

Astrophysics · Physics 2008-11-26 Daisuke Nagai , Alexey Vikhlinin , Andrey V. Kravtsov

Using Planck satellite data, we construct SZ gas pressure profiles for a large, volume-complete sample of optically selected clusters. We have defined a sample of over 8,000 redMaPPer clusters from the Sloan Digital Sky Survey (SDSS),…

Cosmology and Nongalactic Astrophysics · Physics 2018-05-02 Pablo Jimeno , Jose-Maria Diego , Tom Broadhurst , Ivan De Martino , Ruth Lazkoz

The present paper extends to clusters of galaxies the study of Del Popolo (2012), concerning how the baryon-dark matter (DM) interplay shapes the density profile of dwarf galaxies. Cluster density profiles are determined taking into account…

Cosmology and Nongalactic Astrophysics · Physics 2014-02-04 A. Del Popolo

The uniformity of the helium-to-hydrogen abundance ratio in X-ray emitting intracluster medium (ICM) is one of the commonly adopted assumptions in X-ray analyses of galaxy clusters and cosmological constraints derived from these…

Astrophysics · Physics 2011-02-11 Fang Peng , Daisuke Nagai

We present the results from extensive, new observations of the Perseus Cluster of galaxies, obtained as a Suzaku Key Project. The 85 pointings analyzed span eight azimuthal directions out to 2 degrees = 2.6 Mpc, to and beyond the virial…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-16 O. Urban , A. Simionescu , N. Werner , S. W. Allen , S. Ehlert , I. Zhuravleva , R. G. Morris , A. C. Fabian , A. Mantz , P. E. J. Nulsen , J. S. Sanders , Y. Takei

We carry out a two-dimensional study of temperature, entropy and pressure distributions in a nearly volume-limited subsample of REFLEX clusters at redshift 0.3, the REFLEX-DXL. We use the observations gained by XMM-Newton, which cover the…

Astrophysics · Physics 2009-11-11 A. Finoguenov , H. Boehringer , Y. Zhang

Recent Suzaku X-ray observations revealed that the observed entropy profile of the intracluster medium (ICM) deviates significantly from the prediction of hydrodynamical simulations of galaxy clusters. In this work, we show that gas…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-27 Daisuke Nagai , Erwin Lau

Recent observations reveal detailed structures of mergers in galaxy clusters. Moving cold fronts could be identified as remnants of subclusters. They are believed to mark the late stage of a merging process. Dynamics, geometry and extension…

Astrophysics · Physics 2007-05-23 P. M. Koch , Ph. Jetzer

This is the fifth in a series of papers studying the astrophysics and cosmology of massive, dynamically relaxed galaxy clusters. Our sample comprises 40 clusters identified as being dynamically relaxed and hot in Papers I and II of this…

Cosmology and Nongalactic Astrophysics · Physics 2016-09-07 Adam B. Mantz , Steven W. Allen , R. Glenn Morris

Galaxy clusters provide us with important information about the cosmology of our universe. Observations of the X-ray radiation or of the SZ effect allow us to measure the density and temperature of the hot intergalactic medium between the…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-04 Diana Juncher , Steen H. Hansen , Andrea V. Macciò

We describe polarization of the Sunyaev-Zel'dovich (SZ) effect associated with electron pressure anisotropy likely present in the intracluster medium (ICM). The ICM is an astrophysical example of a weakly collisional plasma where the Larmor…

High Energy Astrophysical Phenomena · Physics 2017-12-27 I. Khabibullin , S. Komarov , E. Churazov , A. Schekochihin

This Letter explores influences of intracluster magnetic fields ($\gsim 1\mu$G) submerged in the hot electron gas on classic Sunyaev-Zel'dovich effect (SZE) and thermal bremsstrahlung in X-ray emissions. As the Larmor frequency is much…

Astrophysics · Physics 2009-11-10 Jian Hu , Yu-Qing Lou