منابع مشابه
Broadening of QSO Lyα forest absorbers
We investigate the dependence of QSO Lyα absorption features on the temperature of the absorbing gas and on the amplitude of the underlying dark matter fluctuations. We use high-resolution hydrodynamic simulations in cold dark matter dominated cosmological models. In models with a hotter intergalactic medium (IGM), the increased temperature enhances the pressure gradients between low and high d...
متن کاملStructure in the Lyα Forest
The spatial distribution of Lyα forest absorption systems toward a group of 8, closely spaced QSOs has been analysed and evidence for large scale structure has been found at z = 2.8. Our technique is based on the first and second moments of the transmission probability density function which is capable of identifying and assessing the significance of regions of over-or underdense Lyα absorption...
متن کاملLyα ABSORBER CORRELATIONS AND THE “BIAS” OF THE Lyα FOREST
Lyα absorber correlations contain information about the underlying density distribution associated with a particular class of absorbers. As such, they provide an opportunity to independently measure the “bias” of the Lyman alpha forest, i.e. the relationship between H I column density and underlying dark matter density. In these proceedings we use hydrodynamic simulations to investigate whether...
متن کاملLensing properties of 7 damped Lyα absorbing galaxy-QSO pairs
Le Brun et al. (1997) presented the first identifications of the galaxies giving rise to 7 intermediate redshift damped Lyα (DLA) absorption systems. Here, we study the gravitational lensing properties of these foreground galaxies based on their observed optical appearance and on the absence of any secondary lensed quasar image. We consider the possibility that any secondary image be hidden due...
متن کاملLyα Transmitted Flux of QSO HE2347 with ΛCDM Hydrodynamic Simulations
Using cosmological hydrodynamic simulations of the LCDM model, we present a comparison between the simulation sample and real data sample of H I and He II Lyα transmitted flux in the absorption spectra of the QSO HE23474342. The ΛCDM model is successful in simultaneously explaining the statistical features of both H I and He II Lyα transmitted flux. It includes: 1.) the power spectra of the tra...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 2005
ISSN: 0004-637X,1538-4357
DOI: 10.1086/426062