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Related papers: Galaxy cluster outskirts: a universal entropy prof…

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We study the substructure statistics of a representative sample of galaxy clusters by means of two currently popular substructure characterisation methods, power ratios and centroid shifts. We use the 31 clusters from the REXCESS sample,…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-14 H. Boehringer , G. W. Pratt , M. Arnaud , S. Borgani , J. H. Croston , T. J. Ponman , S. Ameglio , R. F. Temple , K. Dolag

(Abridged) We present in this paper a sample of 14 nearby clusters of galaxies observed with the ROSAT/PSPC. We only select clusters with low galactic nH in order to trace the X-ray emitting intra-cluster medium (ICM) out to large radii. We…

Astrophysics · Physics 2009-11-11 D. M. Neumann

We present a Chandra study of 38 X-ray luminous clusters of galaxies in the ROSAT Brightest Cluster Sample (BCS) that lie at z~0.15-0.4. We find that the majority of clusters at moderate redshift generally have smooth, relaxed morphologies…

Astrophysics · Physics 2009-09-17 F. E. Bauer , A. C. Fabian , J. S. Sanders , S. W. Allen , R. M. Johnstone

High resolution X-ray observations indicate that the entropy profiles in the central regions of some massive cooling flow clusters are well approximated by powerlaws. McCarthy and coworkers recently accounted for this trend with an analytic…

Astrophysics · Physics 2007-05-23 Ian G. McCarthy , Mark A. Fardal , Arif Babul

We studied the physical properties of the intracluster medium in the virialization region of a sample of 320 clusters ($0.056 <z< 1.24$, $kT>3$ keV) in the Chandra archive. With the emission measure profiles from this large sample, the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Andrea Morandi , Ming Sun , William Forman , Christine Jones

Until recently, only about 10% of the total intracluster gas volume had been studied with high accuracy, leaving a vast region essentially unexplored. This is now changing and a wide area of hot gas physics and chemistry awaits discovery in…

Cosmology and Nongalactic Astrophysics · Physics 2015-06-15 Thomas H. Reiprich , Kaustuv Basu , Stefano Ettori , Holger Israel , Lorenzo Lovisari , Silvano Molendi , Etienne Pointecouteau , Mauro Roncarelli

Galaxy clusters are thought to grow hierarchically through the continuous merging and accretion of smaller structures across cosmic time. In the local Universe, these phenomena are still active in the outer regions of massive clusters…

Cosmology and Nongalactic Astrophysics · Physics 2017-05-10 D. Eckert , S. Ettori , E. Pointecouteau , S. Molendi , S. Paltani , C. Tchernin

The analysis of X-ray and Sunyaev-Zel\'dovich measurements of the intracluster medium (ICM) assumes that electrons are in thermal equilibrium with ions in the plasma. However, electron-ion equilibration timescales can be comparable to the…

Cosmology and Nongalactic Astrophysics · Physics 2015-08-20 Camille Avestruz , Daisuke Nagai , Erwin T. Lau , Kaylea Nelson

We investigate the properties of the intracluster medium (ICM) that forms within N-body/hydrodynamical simulations of galaxy clusters in a \LambdaCDM cosmology. When radiative cooling and a simple model for galactic feedback are included,…

Astrophysics · Physics 2009-11-10 Scott T. Kay , Peter A. Thomas , Adrian Jenkins , Frazer R. Pearce

We address the question of how well the density profile of galaxy clusters can be determined by combining strong lensing and velocity dispersion data. We use cosmological dark matter simulations of clusters to test the reliability of the…

Astrophysics · Physics 2010-12-01 M. Meneghetti , M. Bartelmann , A. Jenkins , C. Frenk

Galaxy clusters are unique laboratories for studying astrophysical processes and their impact on gas kinematics. Despite their importance, the full complexity of gas motion within and around clusters remains poorly known. This paper is part…

We present an analysis of Suzaku observations of 14 nearby galaxy clusters and groups (z < 0.06), extending radial coverage out to the virial radius (approximately r200). The sample spans a wide mass range, from M500 about 2x10^13 to…

Astrophysics of Galaxies · Physics 2025-10-07 Kyoko Matsushita , Marie Kondo , Kosuke Sato , Toru Sasaki , Nobuhiro Okabe , Kotaro Fukushima

Many processes within galaxy clusters, such as those believed to govern the onset of thermally unstable cooling and AGN feedback, are dependent upon local dynamical timescales. However, accurately mapping the mass distribution within…

Astrophysics of Galaxies · Physics 2017-03-08 M. T. Hogan , B. R. McNamara , F. Pulido , P. E. J. Nulsen , H. R. Russell , A. N. Vantyghem , A. C. Edge , R. A. Main

Non-gravitational feedback affects the nature of the intra-cluster medium (ICM). X-ray cooling of the ICM and in situ energy feedback from AGN's and SNe as well as {\it preheating} of the gas at epochs preceding the formation of clusters…

Cosmology and Nongalactic Astrophysics · Physics 2016-11-28 Asif Iqbal , Subhabrata Majumdar , Biman B. Nath , Stefano Ettori , Dominique Eckert , Manzoor A. Malik

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

We present a systematic study of gas density perturbations in cool cores of high-mass galaxy clusters. We select 12 relaxed clusters from the Cluster Lensing And Supernova survey with Hubble (CLASH) sample and analyze their cool core…

Cosmology and Nongalactic Astrophysics · Physics 2020-04-08 Shutaro Ueda , Yuto Ichinohe , Sandor M. Molnar , Keiichi Umetsu , Tetsu Kitayama

Recent high-resolution cosmological hydrodynamic simulations run with a variety of codes systematically predict large amounts of entropy in the intra-cluster medium at low redshift, leading to flat entropy profiles and a suppressed…

Cosmology and Nongalactic Astrophysics · Physics 2023-02-10 Edoardo Altamura , Scott T. Kay , Richard G. Bower , Matthieu Schaller , Yannick M. Bahé , Joop Schaye , Josh Borrow , Imogen Towler

[abridged] We present the analysis of the X-ray brightness and temperature profiles for six clusters belonging to both the Cool Core and Non Cool Core classes, in terms of the Supermodel (SM) developed by Cavaliere, Lapi & Fusco-Femiano…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-20 R. Fusco-Femiano , A. Cavaliere , A. Lapi

We examine the incidence of cold fronts in a large sample of galaxy clusters extracted from a (512h^-1 Mpc) hydrodynamic/N-body cosmological simulation with adiabatic gas physics computed with the Enzo adaptive mesh refinement code. This…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-20 Eric J. Hallman , Samuel W. Skillman , Tesla E. Jeltema , Britton D. Smith , Brian W. O'Shea , Jack O. Burns , Michael L. Norman

We present an analysis of the X-ray properties of the galaxy cluster population in the z=0 snapshot of the IllustrisTNG simulations, utilizing machine learning techniques to perform clustering and regression tasks. We examine five…

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