Results 241 to 250 of about 34,328 (275)

Evolution of Clusters of Galaxies

Publications of the Astronomical Society of Japan, 1993
Abstract We have investigated the evolution of clusters of galaxies using direct N-body simulations in which each galaxy is modeled by many particles. We found that the positive correlation between the masses and the distances of galaxies from the center of a cluster develops as the result of perturbations due to close encounters with ...
Yoko Funato, Junichiro Makino, Toshikazu Ebisuzaki   +2 more
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Galaxies and Clusters of Galaxies

1987
Numerous galaxies similar to our own can be observed at distances far beyond the boundaries of our Galaxy. Sometimes they are referred to as “extragalactic nebulae” because they look like faint nebulae when seen through small telescopes. Consequently they were initially given names such as the “Magellanic Clouds”, the “Andromeda nebula” and so forth.
Georgios Contopoulos, Dimitrios Kotsakis
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Galaxies and Clusters of Galaxies

2002
The leap into deep space outside our Milky Way Galaxy, into the realm of the distant galaxies (or the extragalactic nebulae, as they were formerly called), and the beginnings of a cosmology based on observations, will be considered throughout history to be one of the most important achievements of the 20th century.
Albrecht Unsöld, Bodo Baschek
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Dwarf galaxies in Clusters

Astrophysics and Space Science, 2003
Dwarf and Low Surface Brightness (LSB) galaxies are the most numerous type of galaxies in the local Universe. However ubiquitous they are, their properties remain widely unexplored. Dwarf galaxies range from Ultra Compact Objects (UCO), Dwarf Ellipticals (dE), Dwarf Spheroidals (dSph) to Dwarf Irregulars (dIrr) and are generally of low surface ...
Infante Lira, Leopoldo, Mieske, Steffen, Hilker, M.   +2 more
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Galaxy evolution in clusters

Astrophysics and Space Science, 2003
The galaxy populations in present-day clusters are distinctly different from those of the field, indicating that environment plays a strong role in galaxy evolution. This review discusses some of the recent observations of moderate to high redshift clusters.
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On the distribution of galaxies and galaxy clusters

New Vistas in Astrophysics, 2000
The fact that galaxy and galaxy clusters distributions exhibit fractal properties is well established since twenty years 1 ,2. Nowadays, the controversy concerns the range of the fractal regime , the value of the fractal dimension and the eventual presence of a cross-over to homogeneity 3,4,5 In this paper we briefly review the methods of analysis ...
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The Motion of Galaxies in Galaxy Clusters

2012
Zwicky’s observation of the unexpectedly high velocities of the individual galaxies in the cluster of galaxies known as the ComaCluster led to the first appearance of the dark matter hypothesis. Unlike the organized motions in a nearly steady-state of the individual stars in a single spiral galaxy, the galaxies within a cluster are generally observed ...
Fred I Cooperstock, Steven Tieu
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Globular Clusters and Galaxy Formation in Clusters of Galaxies

1984
Taken at face value globular cluster counts indicate that: (1) Most elliptical galaxies in rich clusters were not formed by merging spirals and (2) central galaxies in rich clusters were already very special at the time when they were forming globular clusters.
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The First Galaxies and Galaxy Clusters

2009
Obvious targets for Extremely Large Telescopes are high-redshift galaxies and galaxy (proto-)clusters. However, due to the extremely small field-of-view of such telescopes, finding such objects, notably the rarer proto-clusters, is best be done using other facilities.
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A repeating fast radio burst source localized to a nearby spiral galaxy

Nature, 2020
Benito Marcote, Kenzie Nimmo, Jason Hessels   +2 more
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