Cosmological and astrophysical constraints from the Lymanαforest flux probability distribution function
نویسندگان
چکیده
منابع مشابه
Cosmological and astrophysical constraints from the Lyman-α forest flux probability distribution function
We use the probability distribution function (PDF) of the Lyman-α forest flux at z = 2 − 3, measured from high-resolution UVES/VLT data, and hydrodynamical simulations to obtain constraints on cosmological parameters and the thermal state of the intergalactic medium (IGM) at z ∼ 2 − 3. The observed flux PDF at z = 3 alone results in constraints on cosmological parameters in good agreement with ...
متن کاملCosmological constraints from the convergence 1-point probability distribution
We examine the cosmological information available from the 1-point probability distribution (PDF) of the weak-lensing convergence field, utilizing fast L-PICOLA simulations and a Fisher analysis. We find competitive constraints in the Ωm-σ8 plane from the convergence PDF with 188 arcmin pixels compared to the cosmic shear power spectrum with an equivalent number of modes (` < 886). The converge...
متن کاملTightening Constraints from the Lyman Alpha Forest with the Flux Probability Distribution Function
The analysis of the Lyman-alpha (Lyα) forest of absorption lines in quasar spectra has emerged as a potentially powerful technique to constrain the linear matter power spectrum. In most previous work, the amplitude of the ionizing background was fixed by calibrating simulations to match the observed mean transmitted flux in the Lyα forest. This procedure is undesirable in principle as it requir...
متن کاملMultidimensional cosmological models: cosmological and astrophysical implications and constraints
We investigate four-dimensional effective theories which are obtained by dimensional reduction of multidimensional cosmological models with factorizable geometry and consider the interaction between conformal excitations of the internal space (geometrical moduli excitations) and Abelian gauge fields. It is assumed that the internal space background can be stabilized by minima of an effective po...
متن کاملAstrophysical and Cosmological Constraints on Neutrino masses 1
We review some astrophysical and cosmological properties and implications of neutrino masses and mixing angles. These include: constraints based on the relic density of neutrinos, limits on their masses and lifetimes, BBN limits on mass parameters, neutrinos and supernovae, and neutrinos and high energy cosmic rays. to appear in “Neutrino Mass”, Springer Tracts in Modern Physics, ed. by G. Alta...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society: Letters
سال: 2009
ISSN: 1745-3925,1745-3933
DOI: 10.1111/j.1745-3933.2009.00720.x