scholarly journals Implications of the mild gas motion found with Hitomi in the core of the Perseus cluster

2020 ◽  
Vol 638 ◽  
pp. A138
Author(s):  
Liyi Gu ◽  
Kazuo Makishima ◽  
Ryoji Matsumoto ◽  
Kazuhiro Nakazawa ◽  
Kazuhiro Shimasaku ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Galaxy Evolution ◽  
Core Region ◽  
Cluster Center ◽  
Radiative Cooling ◽  
Clusters Of Galaxies ◽  
X Ray ◽  
The Core ◽  
Cd Galaxies ◽  
Perseus Cluster

Based mainly on X-ray observations, we study the interactions between the intracluster medium (ICM) in clusters of galaxies and their member galaxies. Through (magneto)hydrodynamic and gravitational channels, moving galaxies are expected to drag the ICM around them, and then transfer some fraction of their dynamical energies on cosmological timescales to the ICM. This hypothesis is in line with several observations, including the possible cosmological infall of galaxies toward the cluster center, found over redshifts of z ∼ 1 to z ∼ 0. Further assuming that the energy lost by these galaxies is first converted into ICM turbulence and then dissipated, this picture can explain the subsonic and uniform ICM turbulence, measured with Hitomi in the core region of the Perseus cluster. The scenario may also explain several other unanswered problems regarding clusters of galaxies, such as what prevents the ICM from underoing the expected radiative cooling, how the various mass components in nearby clusters have attained different radial distributions, and how a thermal stability is realized between hot and cool ICM components that co-exist around cD galaxies. This view is also considered to pertain to the general scenario of galaxy evolution, including their environmental effects.

scholarly journals Magnetorotational instability in cool cores of galaxy clusters

2015 ◽  
Vol 81 (5) ◽  
Author(s):  
Carlo Nipoti ◽  
L. Posti ◽  
S. Ettori ◽  
M. Bianconi
Keyword(s):  
Heat Flux ◽  
Heat Conduction ◽  
Galaxy Clusters ◽  
Magnetized Plasma ◽  
Radiative Cooling ◽  
Clusters Of Galaxies ◽  
Magnetorotational Instability ◽  
X Ray ◽  
Stability Properties ◽  
Anisotropic Heat Conduction

Clusters of galaxies are embedded in halos of optically thin, gravitationally stratified, weakly magnetized plasma at the system’s virial temperature. Owing to radiative cooling and anisotropic heat conduction, such intracluster medium (ICM) is subject to local instabilities, which are combinations of the thermal, magnetothermal and heat-flux-driven buoyancy instabilities. If the ICM rotates significantly, its stability properties are substantially modified and, in particular, also the magnetorotational instability (MRI) can play an important role. We study simple models of rotating cool-core clusters and we demonstrate that the MRI can be the dominant instability over significant portions of the clusters, with possible implications for the dynamics and evolution of the cool cores. Our results give further motivation for measuring the rotation of the ICM with future X-ray missions such as ASTRO-H and ATHENA.

Galaxy evolution in distant, x-ray selected clusters of galaxies, 2: CL 0303+1658 and CL 0303+1717

1994 ◽  
Vol 107 ◽  
pp. 8 ◽  
Author(s):  
Daniel G. Fabricant ◽  
Marshall W. Bautz ◽  
Jeffrey E. McClintock
Keyword(s):  
Galaxy Evolution ◽  
Clusters Of Galaxies ◽  
X Ray

The distribution and morphology of X-ray-emitting gas in the core of the Perseus cluster

1981 ◽  
Vol 248 ◽  
pp. 47 ◽  
Author(s):  
A. C. Fabian ◽  
E. M. Hu ◽  
L. L. Cowie ◽  
J. Grindlay
Keyword(s):  
X Ray ◽  
The Core ◽  
Perseus Cluster

Galaxy evolution in distant, X-ray-selected clusters of galaxies. I - CL 1358 + 6245

1991 ◽  
Vol 381 ◽  
pp. 33 ◽  
Author(s):  
Daniel G. Fabricant ◽  
Jeffrey E. McClintock ◽  
Marshall W. Bautz
Keyword(s):  
Galaxy Evolution ◽  
Clusters Of Galaxies ◽  
X Ray

The structure and spectra of the X-ray sources in clusters of galaxies

1979 ◽  
Vol 366 (1726) ◽  
pp. 403-421 ◽  
Keyword(s):  
Emission Lines ◽  
Clusters Of Galaxies ◽  
X Ray ◽  
Preliminary Results ◽  
Current State ◽  
Iron Abundance ◽  
Cluster Properties ◽  
Perseus Cluster

The current state of our knowledge of the Perseus cluster at radio, optical and X-ray wavelengths is reviewed to summarize the nature of cluster sources. Recent results on the X-ray structure of clusters are presented. Objects discussed include the Centaurus and Virgo clusters, Abell 1367 and Abell 478. Preliminary results of a study of 30 cluster X-ray spectra are reported. The derivation of the intra-cluster gas parameters is described and the relations between these parameters and other cluster properties are examined. The detection of highly ionized iron emission lines in the spectra of several clusters is discussed and estimates of iron abundance are presented.

scholarly journals X-RAY SPECTROSCOPY OF THE CORE OF THE PERSEUS CLUSTER WITH SUZAKU : ELEMENTAL ABUNDANCES IN THE INTRACLUSTER MEDIUM

2009 ◽  
Vol 705 (1) ◽  
pp. L62-L66 ◽  
Author(s):  
T. Tamura ◽  
Y. Maeda ◽  
K. Mitsuda ◽  
A. C. Fabian ◽  
J. S. Sanders ◽  
...  
Keyword(s):  
Intracluster Medium ◽  
X Ray ◽  
Elemental Abundances ◽  
The Core ◽  
Perseus Cluster

Deep Chandra observations of the core of the Perseus cluster

2018 ◽  
Vol 14 (S342) ◽  
pp. 127-132
Author(s):  
Jeremy S. Sanders
Keyword(s):  
Spatial Scales ◽  
High Quality ◽  
X Ray ◽  
The Core ◽  
Spatially Resolved ◽  
Spatially Resolved Spectroscopy ◽  
Perseus Cluster ◽  
Metallicity Distribution

AbstractThe Perseus cluster is the X-ray brightest cluster in the sky and with deep Chandra observations we are able to map its central structure on very short spatial scales. In addition, the high quality of X-ray data allows detailed spatially-resolved spectroscopy. In this paper I review what these deep observations have told us about AGN feedback in clusters, sloshing and instabilities, and the metallicity distribution.

Analytical Electron Microscopy of Neutron-Irradiated Reactor Alloys

1982 ◽  
Vol 40 ◽  
pp. 594-597
Author(s):  
L. E. Thomas
Keyword(s):  
Analytical Electron Microscopy ◽  
Structural Steels ◽  
Core Region ◽  
Fast Breeder Reactor ◽  
X Ray ◽  
The Core ◽  
Analytical Electron ◽  
Segregation Of Alloying Elements ◽  
Edx Microanalysis ◽  
High Neutron

Exposure to the high neutron fluxes and temperatures from 400 to 650°C in the core region of a fast breeder reactor profoundly alters the microstructure and properties of structural steels and superalloys. The development of irradiation-induced voids, dislocations and precipitates, as well as segregation of alloying elements on a microscopic scale has been related to macroscopic swelling, creep, hardening and embrittlement which occur during prolonged exposures in reactor. Microanalytical studies using TEM/STEM methods, primarily energy dispersive X-ray (EDX) microanalysis, have greatly aided our understanding of alloy behavior under irradiation.

Compact and diffuse X-ray sources in the core of the Perseus cluster /Abell 426/

1978 ◽  
Vol 221 ◽  
pp. L43 ◽  
Author(s):  
H. Helmken ◽  
J. P. Delvaille ◽  
A. Epstein ◽  
M. J. Geller ◽  
H. W. Schnopper ◽  
...  
Keyword(s):  
X Ray ◽  
The Core ◽  
Perseus Cluster
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