The shapes of galaxy clusters
نویسندگان
چکیده
منابع مشابه
Shapes of Distant Clusters : the Connection to Blue Galaxy Fractions
Based on ROSAT PSPC pointed observations, we have determined the aggregate X-ray shapes of 10 distant (z = 0. Four of the clusters have global X-ray ellipticities ∼ > 0.2, as measured on a scale of diameter ∼ 3h −1 50 Mpc. These strongly elongated clusters tend to show substantial amounts of substructure, indicating that they are dynamically young systems. Most interestingly, the global X-ray e...
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We explore the use of the tangential component of weak lensing shear to characterize the ellipticity of clusters of galaxies. We introduce an ellipticity estimator, and quantify its properties for isolated clusters from ΛCDM N-body simulations. We compare the N-body results to results from smooth analytic models. The expected distribution of the estimator for mock observations is presented, and...
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Triaxial deformations are considered for determining the binding energies of open-shell, unpolarized HeN clusters. The shapes of He clusters are found to be close to spherical, in contrast to the well-deformed shapes of alkali-metal clusters. As a result, odd-even alternations and subshell closures between major shells are absent in the size evolution of the chemical potentials, and the second-...
متن کاملThe Chemistry of Galaxy Clusters
From X-ray observations of galaxy clusters one derives the mass of the intracluster medium along with its chemical composition. Optical/infrared observations are used to estimate the mass of the stellar components of galaxies, along with their chemical composition and age. This review shows that when combining all this information, several interesting inferences can be drawn, including: (1) gal...
متن کاملThe Transparency of Galaxy Clusters
If galaxy clusters contain intracluster dust, the spectra of galaxies lying behind clusters should show attenuation by dust absorption. We compare the optical (3500 7200 Å) spectra of 60,267 luminous, early-type galaxies selected from the Sloan Digital Sky Survey to search for the signatures of intracluster dust in z ∼0.05 clusters. We select massive, quiescent (i.e., non-star-forming) galaxies...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1995
ISSN: 0035-8711,1365-2966
DOI: 10.1093/mnras/273.1.30