The one-dimensional power spectrum from the SDSS DR14 Lyα forests

Abstract

We present a measurement of the 1D Lyα forest flux power spectrum, using the complete Baryon Oscillation Spectroscopic Survey (BOSS) and first extended-BOSS (eBOSS) quasars at z qso > 2.1, corresponding to the fourteenth data release (DR14) of the Sloan Digital Sky Survey (SDSS). Our results cover thirteen bins in redshift from z Lyα = 2.2 to 4.6, and scales up to k = 0.02 (km/s) −1 . From a parent sample of 180,413 visually inspected spectra, we selected the 43,751 quasars with the best quality; this data set improves the previous result from the ninth data release (DR9), both in statistical precision (achieving a reduction by a factor of two) and in redshift coverage. We also present a thorough investigation of identified sources of systematic uncertainties that affect the measurement. The resulting 1D power spectrum of this work is in excellent agreement with the one from the BOSS DR9 data.

Lyman-α power spectrum as a probe of modified gravity

“…This also defines the 1D logarithmic power as ∆ 2 δ F ,1D (k) = (k/π)P δ F ,1D (k), which we compare with observations [55][56][57] in Fig. 8.…”

“…7 the ratio of the Lyman-α power spectrum to the linear matter density power spectrum, at redshift z = 3 as a function of the wave number . The data points are observations from [55] (stars), [56] (circles) and [57] (triangles). The solid line is our model.…”

“…The points are the numerical simulations of[14] for f R0 = −10 −4 (red crosses) and f R0 = −10 −5 (green circles). The symmetric upper and lower black dot-dashed lines are the ±1σ relative errors of the observational results of[57]. Right panel: case of the K-mouflage model.…”

“…Relative deviation of the 1D Lyman-α power spectrum at z = 3 due to a 10% increase of the IGM temperature (red solid line) or a 10% increase of the redshift-space bias factor β (blue dashed line). The symmetric upper and lower black dot-dashed lines are the ±1σ relative errors of the observational results of[57].…”

One‐parametric description for scalar field dark matter potentials

“…Whereas for the trigonometric potential there is a bump at large wavenumbers besides the characteristic cut-off, the quadratic and hyperbolic potentials are very similar in their prediction of the structure formation. The data points are from Chabanier et al (2019) and are shown for reference.…”