In a six-year program started in 2014 July, the Extended Baryon Oscillation Spectroscopic
Survey (eBOSS) will conduct novel cosmological observations using the BOSS …

The LOFAR Two-metre Sky Survey (LoTSS) is a deep 120–168 MHz imaging survey that will
eventually cover the entire northern sky. Each of the 3170 pointings will be observed for 8 h …

We present the design and performance of the multi-object fiber spectrographs for the Sloan
Digital Sky Survey (SDSS) and their upgrade for the Baryon Oscillation Spectroscopic …

The Sloan Digital Sky Survey (SDSS; York et al. 2000) started observations in 1998 and has
completed three different phases. The data collected includes optical imaging of most of the …

We present the final Sloan Digital Sky Survey IV (SDSS-IV) quasar catalog from Data
Release 16 of the extended Baryon Oscillation Spectroscopic Survey (eBOSS). This catalog …

We report a detection of the baryon acoustic oscillation (BAO) feature in the three-
dimensional correlation function of the transmitted flux fraction in the Lyα forest of high …

We derive constraints on cosmological parameters and tests of dark energy models from the
combination of baryon acoustic oscillation (BAO) measurements with cosmic microwave …

We measure the large-scale cross-correlation of quasars with the Lyα forest absorption,
using over 164,000 quasars from Data Release 11 of the SDSS-III Baryon Oscillation …

We have used flux-transmission correlations in Lyα forests to measure the imprint of baryon
acoustic oscillations (BAO). The study uses spectra of 157 783 quasars in the redshift range …

Luminous quasars at $ z\gt 5.6$ can be studied in detail with the current generation of
telescopes and provide us with unique information on the first gigayear of the universe. Thus …