Tightening Constraints from the Lyα Forest with the Flux Probability Distribution Function
نویسندگان
چکیده
منابع مشابه
Tightening 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 کاملCosmological 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 کاملThe probability distribution of the Lyα transmitted flux from a sample of SDSS quasars
We present a measurement of the probability distribution function (PDF) of the transmitted flux in the Lyα forest from a sample of 3492 quasars included in the SDSS DR3 data release. Our intention is to investigate the sensitivity of the Lyα flux PDF as measured from low resolution and low signal-to-noise data to a number of systematic errors such as uncertainties in the mean flux, continuum an...
متن کاملModelling the IGM and the Lyα forest at high redshift from the dark matter distribution
A variety of approximate schemes for modelling the low-density Intergalactic Medium (IGM) in the high-redshift Universe is compared to the results of a large high-resolution hydro-dynamical simulation. These schemes use either an analytical description of the dark matter distribution and the IGM or numerical simulations of the DM distributions combined with different approximate relations betwe...
متن کاملThe Gamma-Ray-Flux Probability Distribution Function from Galactic Halo Substructure
One of the targets of the recently launched Fermi Gamma-ray Space Telescope is a diffuse gamma-ray background from dark-matter annihilation or decay in the Galactic halo. N-body simulations and theoretical arguments suggest that the dark matter in the Galactic halo may be clumped into substructure, rather than smoothly distributed. Here we propose the gamma-ray-flux probability distribution fun...
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: The Astrophysical Journal
سال: 2006
ISSN: 0004-637X,1538-4357
DOI: 10.1086/498699