منابع مشابه
Power spectrum from weak-shear data
We demonstrate that the aperture mass as a measure for cosmic shear closely approximates (to better than ≈ 5%) the scaled and shifted power spectrum of the projected mass density. This cosmological weak-lensing information can thus be used to directly infer the projected matter power spectrum with high accuracy. As an application, we show that aperturemass observations can be used to constrain ...
متن کاملThe shear power spectrum from the COMBO-17 survey
We perform a statistical weak lensing or “cosmic shear” analysis of the COMBO-17 survey – a unique dataset with shear quality R-band imaging and accurate photometric redshift estimates (σz = 0.05) for ∼ 90% of galaxies to mR ≤ 24.0. We undertake a full maximum likelihood analysis to measure directly from the data the weak lensing power spectra, C l , C ββ l and C l in 5 band powers from l = 400...
متن کاملCosmic Shear and Power Spectrum Normalization with the Hubble Space Telescope
Weak lensing by large-scale structure provides a direct measurement of matter fluctuations in the universe. We report a measurement of this ‘cosmic shear’ based on 271 WFPC2 archival images from the Hubble Space Telescope Medium Deep Survey (MDS). Our measurement method and treatment of systematic effects were discussed in an earlier paper. We measure the shear variance on scales ranging from 0...
متن کاملEffect of Hot Baryons on the Weak-lensing Shear Power Spectrum
We investigate the impact of the intracluster medium on the weak-lensing shear power spectrum. The shear power spectrum depends on the total mass power spectrum. With the halo model, we find that the baryon power spectrum is significantly lower than the dark matter power spectrum on scales well below the linear scale. The effect on the shear power spectrum is much less pronounced. Nevertheless,...
متن کاملNew Cascaded Multilevel Inverter With Reduced Power Electronic Components
In this paper, a new structure for cascade multilevel inverter is presented which consists of a series connection of several sub-multilevel units. Each sub-multilevel unit comprises of eight unidirectional switches, two bidirectional switches, and six DC voltage sources. For the proposed cascade topology, two algorithms are presented to produce all possible levels at the output voltage waveform...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2006
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.73.023009