The Non-Linear Power Spectrum of the Lyman Alpha Forest

Abstract

The Lyman alpha forest power spectrum has been measured on large scales by the BOSS survey in SDSS-III at $z\sim 2.3$, has been shown to agree well with linear theory predictions, and has provided the first measurement of Baryon Acoustic Oscillations at this redshift. However, the power at small scales, affected by non-linearities, has not been well examined so far. We present results from a variety of hydrodynamic simulations to predict the redshift space non-linear power spectrum of the Lyman Alpha transmission for several models, testing the dependence on resolution and box size. A new fitting formula is introduced to facilitate the comparison of our simulation results with observations and other simulations. The non-linear power spectrum has a generic shape determined by a transition scale from linear to non-linear anisotropy, and a Jeans scale below which the power drops rapidly. In addition, we predict the two linear bias factors of the Lyman Alpha forest and provide a better physical interpretation of their values and redshift evolution. The dependence of these bias factors and the non-linear power on the amplitude and slope of the primordial fluctuations power spectrum, the temperature-density relation of the intergalactic medium, and the mean Lyman Alpha transmission, as well as the redshift evolution, is investigated and discussed in detail. A preliminary comparison to the observations shows that the predicted redshift distortion parameter is in good agreement with the recent determination of Blomqvist et al., but the density bias factor is lower than observed. We make all our results publicly available in the form of tables of the non-linear power spectrum that is directly obtained from all our simulations, and parameters of our fitting formula.

63 pages, 32 figures, 11 tables, link to online material, submitted to JCAP; revised in response to first referee report

References in corpus (12)

• Baryon Acoustic Oscillations in the Lyα forest of BOSS DR11 quasars
• Baryon Acoustic Oscillations in the Ly-α forest of BOSS quasars
• HeII Reionization and its Effect on the IGM
• Dark energy and curvature from a future baryonic acoustic oscillation survey using the Lyman-alpha forest
• Possible evidence for an inverted temperature-density relation in the intergalactic medium from the flux distribution of the Lyman-alpha forest
• An improved measurement of the flux distribution of the Ly-alpha forest in QSO absorption spectra: the effect of continuum fitting, metal contamination and noise properties
• Constraint on neutrino masses from SDSS-III/BOSS Ly$\alpha$ forest and other cosmological probes
• The thermal history of the intergalactic medium down to redshift z=1.5: a new curvature measurement
• Characterizing the Pressure Smoothing Scale of the Intergalactic Medium
• Scale-dependent bias in the BAO-scale intergalactic neutral hydrogen
• Numerical Simulations of the Lyman-alpha forest - A comparison of Gadget-2 and Enzo
• Broadband distortion modeling in Lyman-$\alpha$ forest BAO fitting

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• Mapping Lyman-alpha forest three-dimensional large scale structure in real and redshift space
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• Modeling Lyman-α Forest Cross-Correlations with LyMAS
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