# The one-dimensional power spectrum from the SDSS DR14 Ly$\alpha$ forests

## TL;DR

This paper measures the 1D Lyα forest flux power spectrum using SDSS DR14 quasars, improving statistical precision and redshift coverage over previous results, and thoroughly investigates systematic uncertainties.

## Contribution

It provides the most precise measurement of the 1D Lyα flux power spectrum from SDSS DR14, extending redshift coverage and analyzing systematic uncertainties.

## Key findings

- Results agree with previous BOSS DR9 measurements.
- Achieved a twofold reduction in statistical errors.
- Extended redshift coverage up to z=4.6.

## Abstract

We present a measurement of the 1D Ly$\alpha$ forest flux power spectrum, using the complete Baryon Oscillation Spectroscopic Survey (BOSS) and first extended-BOSS (eBOSS) quasars at $z_{\rm qso}>2.1$, corresponding to the fourteenth data release (DR14) of the Sloan Digital Sky Survey (SDSS). Our results cover thirteen bins in redshift from $z_{\rm Ly\alpha}=2.2$ to 4.6, and scales up to $k=0.02\rm \,(km/s)^{-1}$. 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.