Baryon acoustic oscillations in the Lyman alpha forest
نویسندگان
چکیده
منابع مشابه
Baryon Acoustic Oscillations
Observations of baryon acoustic oscillations (BAO) in the clustering of galaxies offer an attractive method for setting cosmological constraints. The physics of the BAO production is well understood, and it is hard to imagine that galaxy formation processes will significantly distort this large-scale signal. The large volume of the Universe and redshift range probed by proposed SKA surveys will...
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It is shown that many properties of Lyα forest absorbers can be derived using simple physical arguments. Analytical expressions are derived for the density and the size of an absorber as a function of its neutral hydrogen column density, which agree well with both observations and hydrodynamical simulations. An expression is presented to compute ΩIGM from the observed column density distributio...
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We show that it is now possible to image optically thick Ly clouds in uores-cent Ly emission with a relatively long (20 hr) integration on a large (10 m) telescope. For a broad range of column densities (N > 10 18:5 cm 2), the ux of Ly photons from recombination cascades is equal to 0:6 times the ux of ionizing photons, independent of the geometry of the cloud. Additional Ly photons are produce...
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The comparison of quasar absorption spectra with numerically simulated spectra from hierarchical cosmological models of structure formation promises to be a valuable tool to discriminate among these models. We present simulation results for the column density, Doppler b parameter, and optical depth probability distributions for five popular cosmological models.
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We outline the physical picture of the high-redshift Lyα forest that has emerged from cosmological simulations, discuss statistical characteristics of the forest that can be used to test theories of structure formation, present a preliminary comparison between simulation predictions and measurements from a sample of 28 Keck HIRES QSO spectra, and summarize the results of a recent determination ...
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ژورنال
عنوان ژورنال: Journal of Physics: Conference Series
سال: 2009
ISSN: 1742-6596
DOI: 10.1088/1742-6596/180/1/012021