Results 271 to 280 of about 150,051 (304)
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Galaxies and Clusters of Galaxies
1987Numerous 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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The Origin of Galaxies and Clusters of Galaxies
Science, 1984Debate on how galaxies and clusters of galaxies formed has reached an interesting stage at which one can find arguments for quite different scenarios. The galaxy distribution has a complex "frothy" character that could be the fossil of a network of protoclusters or pancakes that produced galaxies.
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1998
Associations of galaxies range from pairs and small groups of galaxies, through the giant clusters containing thousands of galaxies, to the vast structures on scales much greater than clusters, the vast ‘walls’ which surround the large voids seen in Fig. 2.5. Very few galaxies can be considered to be truly isolated.
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Associations of galaxies range from pairs and small groups of galaxies, through the giant clusters containing thousands of galaxies, to the vast structures on scales much greater than clusters, the vast ‘walls’ which surround the large voids seen in Fig. 2.5. Very few galaxies can be considered to be truly isolated.
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Reports on Progress in Physics, 1981 A review is given of work on clusters of galaxies. During the last decade it was clearly established that the average mass-to-light ratio, (M/L), of galaxy clusters is much larger than that of the visible part of individual galaxies, which suggests the presence of missing mass in clusters.
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Science, 2002
Globular clusters--compact and bright assemblies of stars--were long believed to have formed early in our galaxy's evolution. But as [Clement][1] explains in her Perspective, recent studies point to another, more recent source. During encounters with other, smaller galaxies, clusters may be captured.
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Globular clusters--compact and bright assemblies of stars--were long believed to have formed early in our galaxy's evolution. But as [Clement][1] explains in her Perspective, recent studies point to another, more recent source. During encounters with other, smaller galaxies, clusters may be captured.
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Globular Clusters and Galaxy Formation in Clusters of Galaxies
1984Taken 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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New Astronomy Reviews, 2001
Abstract Clusters constitute one major source of information for cosmology. In the present paper, I discuss briefly observed properties of clusters, with emphasis on their X-ray properties and their use for the determination of the density parameter of Universe Ω 0 .
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Abstract Clusters constitute one major source of information for cosmology. In the present paper, I discuss briefly observed properties of clusters, with emphasis on their X-ray properties and their use for the determination of the density parameter of Universe Ω 0 .
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1988
The all sky catalogue of clusters of galaxies prepared by Abell,Corwin and Olowin is now completed and the first catalogue of distant clusters by Gunn,Hoessel and Oke has been published. I stress, in relation to such catalogues, the need of using numerical simulations to estimate their completeness, understand the observations and achieve unbiased ...
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The all sky catalogue of clusters of galaxies prepared by Abell,Corwin and Olowin is now completed and the first catalogue of distant clusters by Gunn,Hoessel and Oke has been published. I stress, in relation to such catalogues, the need of using numerical simulations to estimate their completeness, understand the observations and achieve unbiased ...
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1983
The subject of this school, ‘The Origin and Evolution of Galaxies’, should include ‘Clusters of Galaxies’ in the title! Not only is galaxy clustering an essential aspect of the galaxy formation process, but I shall show that there is considerable evidence that galaxy morphology is not independent of is cluster environment.
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The subject of this school, ‘The Origin and Evolution of Galaxies’, should include ‘Clusters of Galaxies’ in the title! Not only is galaxy clustering an essential aspect of the galaxy formation process, but I shall show that there is considerable evidence that galaxy morphology is not independent of is cluster environment.
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1959
The term nebulae means on the one hand clouds of gas and dust which are distributed among the stars. Within the Milky Way system, there are perhaps a few thousand of these galactic nebulae, their distribution exhibiting a decided preference for low galactic latitudes.
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The term nebulae means on the one hand clouds of gas and dust which are distributed among the stars. Within the Milky Way system, there are perhaps a few thousand of these galactic nebulae, their distribution exhibiting a decided preference for low galactic latitudes.
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