منابع مشابه
Abundance of substructure in clusters of galaxies
It is widely recognized that cold dark matter models predict abundant dark matter substructure in halos of all sizes. Galaxy-galaxy lensing provides a unique opportunity to directly measure the presence and the mass of such substructures in clusters of galaxies. Here we present the mass function of substructures obtained from lensing in massive HST cluster lenses, and compare it with that obtai...
متن کاملSubstructure in Clusters of Galaxies and the value of
We investigate the formation of clusters of galaxies in an expanding universe using a new code that regrids at a region of high density. In particular we investigate two models for the initial conditions, both with the standard CDM power spectrum-one has = 1 and the other = 0:2. Both universes have H 0 = 100 km s 1 Mpc 1 and = 0. The level of substructure in the nal cluster can be used as a dis...
متن کاملTurbulence Generation by Substructure Motion in Clusters of Galaxies
Clusters of galaxies form through major merger and/or absorption of smaller groups. In fact, some characteristic structures such as cold fronts, which are likely relevant to moving substructures, are found by Chandra. It is expected that moving substructures generate turbulence in the intracluster medium (ICM). Such turbulence probably plays a crucial role in mixture and transport of gas energy...
متن کاملSubstructure: Clues to the Formation of Clusters of Galaxies
We have examined the spatial distribution of substructure in clusters of galaxies using Einstein X-ray observations. Subclusters are found to have a markedly anisotropic distribution which reeects the surrounding matter distribution on supercluster scales. Our results suggest a picture in which cluster formation proceeds by mergers of sub-clusters along large-scale laments. The implications of ...
متن کاملSubstructure in Dwarf Galaxies
Recent years have seen a series of large-scale photometric surveys with the aim of detecting substructure in nearby dwarf galaxies. Some of these objects display a varying distribution of each stellar population, reflecting their star formation histories. Also, dwarf galaxies are dominated by dark matter, therefore luminous substructure may represent a perturbation in the underlying dark materi...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1983
ISSN: 0074-1809
DOI: 10.1017/s0074180900039048