Inferring the Linear Power Spectrum from the Lyα Forest
نویسندگان
چکیده
منابع مشابه
Inferring the Linear Power Spectrum from the Lyman-α Forest
We discuss the determination of the linear power spectrum of dark matter fluctuations from measurements of the transmitted flux Ly-α Forest power spectrum. We show that at most scales probed by current measurements, the flux power spectrum is significantly affected by non-linear corrections to the linear dark matter power spectrum due to gravitational clustering. Inferring the linear dark matte...
متن کاملNon-Gaussianity and the recovery of the mass power spectrum from the Lyα forest
We investigate the effect of non-Gaussianity on the reconstruction of the initial mass field from the Lyα forest. We show that the transmitted flux of QSO absorption spectra are highly non-Gaussian in terms of the statistics, the kurtosis spectrum and scale-scale correlation. These non-Gaussianities can not be completely removed by the conventional algorithm of Gaussianization, and the scale-sc...
متن کاملThe matter power spectrum at small scales: an estimate from the Lyα forest optical depth
We measure the matter power spectrum on small scales from 31 Lyα spectra spanning the redshift range of 1.6-3.6. The optical depth, τ , for Lyα absorption of the intergalactic medium is obtained from the flux using the inversion method of Nusser & Haehnelt (1999). The optical depth is converted to density by using a simple power law relation, τ ∝ (1 + δ)α. The non-linear 1D power spectrum of th...
متن کاملConstraints on Cosmological Parameters from the Lyα Forest Power Spectrum and COBE-DMR
We combine COBE-DMR measurements of cosmic microwave background (CMB) anisotropy with a recent measurement of the mass power spectrum at redshift z = 2.5 from Lyα forest data to derive constraints on cosmological parameters and test the inflationary cold dark matter (CDM) scenario of structure formation. By treating the inflationary spectral index n as a free parameter, we are able to find succ...
متن کاملTHE IMPACT OF TEMPERATURE FLUCTUATIONS ON THE Lyα FOREST POWER SPECTRUM
We explore the impact of spatial fluctuations in the intergalactic medium (IGM) temperature on the Lyα forest flux power spectrum near z ∼ 3. We develop a semi-analytic model to examine temperature fluctuations resulting from inhomogeneous HI and incomplete HeII reionizations. There are two main motivations for this investigation. First, detection of these fluctuations might provide insight int...
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: 2003
ISSN: 0004-637X,1538-4357
DOI: 10.1086/374407