A Step to the Reionization Epoch
نویسندگان
چکیده
منابع مشابه
The Epoch of Reionization
We have modelled the process of reionization of the intergalactic medium (IGM) by photoionization by galaxies, in order to learn what galaxy formation in the framework of the CDM model predicts for the epoch of reionization. We use a sophisticated semi-analytic model of galaxy formation to track the formation of these galaxies, their influence on the IGM, and the back-reaction of the state of t...
متن کاملA very extended reionization epoch ?
The recent observations of cross temperature-polarization power spectra of the Cosmic Microwave Background (CMB) made by the WMAP satellite are in better agreement with a high value of the Thomson scattering optical depth τ ≈ 0.17. This value is close to τ = 0.3, which is taken as the upper limit in the parameter extraction analysis made by the WMAP team. However, models with τ ∼ 0.3 provide a ...
متن کاملPaper: the Precision Array to Probe the Epoch of Reionization
The Precision Array to Probe the Epoch of Reionization is a collaborative effort between the University of Virginia, the National Radio Astronomy Observatory, the University of California at Berkeley, the University of Pennsylvania, and Curtin University in Western Australia. This array of low frequency radio antennas will be used to detect neutral hydrogen in the universe from a time before it...
متن کاملProbing the Intergalactic Medium out to the Reionization Epoch
We propose to attempt to determine the epoch at which the intergalactic medium (IGM) was reionized by searching for characteristic spectral features in the redshift-smeared ‘GunnPeterson’ Lyα foreground absorption in the spectra of UV-bright objects uncovered by NGST at z ∼> 5. If – as is widely anticipated – localized sources such as young galaxies and quasars were responsible for reionizing t...
متن کاملCosmological perturbations and the reionization epoch
We investigate the dependence of the epoch of reionization on the properties of cosmological perturbations, in the context of cosmologies permitted by WMAP. We compute the redshift of reionization using a simple model based on the Press–Schechter approximation. For a power-law initial spectrum we estimate that reionization is likely to occur at a redshift zreion = 17+10 −7 , consistent with the...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 2002
ISSN: 0074-1809
DOI: 10.1017/s0074180900168585