Giant Arc Statistics and Cosmological Parameters
نویسندگان
چکیده
منابع مشابه
Giant Arc Statistics and Cosmological Parameters
We study with semi-analytical methods the statistics of pronounced arcs caused by lensing of galaxies by foreground galaxy clusters. For the number density and redshift distribution of rich clusters we use Press-Schechter theory, normalized on the basis of empirical data. For the background sources we make use of observational results in the Hubble Deep Field. We present results for three diffe...
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We use high-resolution N -body simulations to investigate the optical depth of giant arcs with length-to-width ratio larger than 7.5 and 10 in the ‘standard’ ΛCDM model with σ8 = 0.9 and Ωm,0 = 0.3 and a model based on three-year Wilkinson Microwave Anisotropy Probe (WMAP) data. We find that, in dark-matter only simulations, the lensing probability in the three-year WMAP model (with σ8 = 0.74 a...
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We calculate the expected number of gravitationally lensed arcs on the whole sky due to foreground galaxy clusters for different cosmological models. We use the redshift and magnitude distribution for sources in the Hubble Deep Field to describe the background galaxies, and model the foreground galaxy clusters as singular isothermal spheres. We account for the redshift evolution of foreground l...
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The frequency of giant arcs— highly distorted and strongly gravitationally lensed background galaxies— is a powerful test for cosmological models. Previous comparisons of arc statistics for the currently favored concordance cosmological model (a flat lambda-dominated universe) with observations have shown an apparently large discrepancy. We present here new ray-shooting results, based on a high...
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We have performed high-resolution hydrodynamic simulations of the Lyα forest in a variety of popular cold dark matter dominated cosmologies, including a low density and a vacuum-dominated model. The fluctuation amplitude of these models is chosen to match the observed abundance of galaxy clusters at low redshift. We assume that the intergalactic medium is photoionized and photoheated by a unifo...
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ژورنال
عنوان ژورنال: Annalen der Physik
سال: 2000
ISSN: 0003-3804,1521-3889
DOI: 10.1002/(sici)1521-3889(200005)9:3/5<384::aid-andp384>3.0.co;2-y