Multiresolution Analysis of Substructure in Dark Matter Halos
نویسندگان
چکیده
منابع مشابه
Multiresolution Analysis of Substructure in Dark Matter Halos
Multiresolution analysis is applied to the problem of halo identification in cosmological N-body simulations. The procedure makes use of a discrete wavelet transform known as the à trous algorithm in combination with segmentation analysis. It has the ability to find halos in dense environments and to separate multiple levels of substructure, as is illustrated in the analysis of a 500,000 partic...
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We use numerical simulations to examine the substructure within galactic and cluster mass halos that form within a hierarchical universe. Clusters are easily reproduced with a steep mass spectrum of thousands of substructure clumps that closely matches observations. However, the survival of dark matter substructure also occurs on galactic scales, leading to the remarkable result that galaxy hal...
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Multiple-image quasar lenses can be used to constrain the substructure mass fraction in galaxy-sized dark matter halos via anomalous flux ratios of lensed images. The flux ratios, however, can be affected by both the substructure in the lens halo and by isolated small-mass halos along the entire line-ofsight to the lensed source. While lensing by dark matter clumps near the lens galaxy is more ...
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In this proceeding, we review three recent results. First, we show that halos formed in simulations with gas cooling are significantly rounder than halos formed in dissipationless N-body simulations. The increase in principle axis ratios is ∼ 0.2 − 0.4 in the inner halo and remains significant at large radii. Second, we discuss the CDM substructure crisis and demonstrate the sensitivity of the ...
متن کاملLensing Optical Depths for Substructure and Isolated Dark Matter Halos
Multiply-imaged quasar lenses can be used to constrain the substructure mass fraction in galaxysized dark matter halos via anomalous flux ratios in lensed images. The flux ratios, however, can be affected by both the substructure in the lens halo and by isolated small-mass halos along the entire line-of-sight to the lensed source. While lensing by dark matter clumps near the lens galaxy is more...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2002
ISSN: 0004-637X,1538-4357
DOI: 10.1086/342645