نتایج جستجو برای: cluster of galaxy

تعداد نتایج: 21184710  

2008
G. Murante

We present results from two high–resolution hydrodynamical simulations of proto–cluster regions at z ≃ 2.1. The simulations have been compared to observational results for the socalled Spiderweb galaxy system, the core of a putative proto–cluster region at z = 2.16, found around a radio galaxy. The simulated regions have been chosen so as to form a poor cluster with M200 ≃ 10 hM⊙ (C1) and a ric...

2001
Sabine Schindler

Various cosmological applications of galaxy clusters are presented. Clusters are used to determine the baryon fraction, dark matter distribution and the matter density Ωm of the universe. They also contain a wealth of information about structure formation and evolution on different scales: large-scale structure, cluster formation and also galaxy formation via the interaction of cluster galaxies...

Journal: :iranian journal of astronomy and astrophysics 2014
habib g. khosroshahi louisa a. nolan

it is inferred from the symmetrical and luminous x-ray emission of fossil groups that they are mature, relaxed galaxy systems. cosmological simulations and observations focusing on their dark halo and inter-galactic medium properties confirm their early formation. recent photometric observations suggest that, unlike the majority of non-fossil brightest group galaxies (bggs), the central early-t...

Journal: :The Astronomy and Astrophysics Review 2020

Journal: :Monthly Notices of the Royal Astronomical Society 2006

2008
Philippe Fischer David Schade L. Felipe Barrientos

Gravitational lensing is an important tool for probing the mass distribution of galaxies. In this letter we report the discovery of a new quadruple lens HST 1411+5211 found in archived WFPC2 images of the galaxy cluster CL140933+5226. If the galaxy is a cluster member then its redshift is z = 0.46. The images of the source appear unresolved in the WFC implying that the source is a quasar. We ha...

1996
Duncan A. Forbes Marijn Franx Garth D. Illingworth

New globular clusters may form in the merger of two galaxies. Perhaps the best examples of merger remnants are the set of ellipticals with kinematically–distinct cores. Here we present HST WFPC2 imaging of 14 kinematically–distinct core ellipticals to examine their globular cluster systems. In particular, we probe the galaxy central regions, for which we might expect to see the strongest signat...

2015
A. G. Noble T. M. A. Webb H. K. C. Yee A. Muzzin G. Wilson R. F. J. van der Burg M. L. Balogh D. L. Shupe

We present a five-band Herschel study (100–500 μm) of three galaxy clusters at z 1.2 ~ from the Spitzer Adaptation of the Red-Sequence Cluster Survey. With a sample of 120 spectroscopically confirmed cluster members, we investigate the role of environment on galaxy properties utilizing the projected cluster phase space (line-of-sight velocity versus clustercentric radius), which probes the time...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه تربیت مدرس - دانشکده علوم انسانی 1392

this research has been taken among the students of high school in karaj city during the years 1391 and 1392. this is a survey research and data gathering is through questionnaires. studying the “an analysis of students’ tendency toward non-native reference groups in karaj”. the questionnaire was distributed among 260 of these students who were chosen through multi step cluster sampling. conside...

2000
Werner Vogels Dan Dumitriu

In this paper we present the main concepts behind the Galaxy cluster management framework. Galaxy is focused on servicing large-scale enterprise clusters through the use of novel, highly scalable communication and management techniques. Galaxy is a flexible framework built upon the notion of low-level management of cluster farms, where within these farms islands of specific cluster management t...

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