The matter power spectrum from the Lyα forest: an optical depth estimate
نویسندگان
چکیده
منابع مشابه
The 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 کاملThe matter power spectrum from the Ly α forest : an optical depth estimate
We measure the matter power spectrum 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 the gas density i...
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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...
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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...
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We pay particular attention to the high end of the Lyα optical depth distribution of a quasar spectrum. Based on the flux distribution (MiraldaEscudé et al. 1996), a simple yet seemingly cosmological model-differentiating statistic, ∆τ0 — the cumulative probability of a quasar spectrum with Lyα optical depth greater than a high value τ0 — is emphasized. It is shown that two different models — t...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2006
ISSN: 0035-8711
DOI: 10.1111/j.1365-2966.2006.10333.x