We summarize what large surveys of the contemporary Universe have taught us about the
physics and phenomenology of the processes that link the formation and evolution of …

Massive black holes (BHs) are at once exotic and yet ubiquitous, residing at the centers of
massive galaxies in the local Universe. Recent years have seen remarkable advances in …

In this paper, we provide updated constraints on the bolometric quasar luminosity function
(QLF) from z= 0 to z= 7. The constraints are based on an observational compilation that …

We present the discovery of nine quasars at $ z\sim 6$ identified in the Sloan Digital Sky
Survey (SDSS) imaging data. This completes our survey of $ z\sim 6$ quasars in the SDSS …

We assess a model of late cosmic reionization in which the ionizing background radiation
arises entirely from high-redshift quasars and other active galactic nuclei (AGNs). The low …

Determinations of the ultraviolet (UV) luminosity function of active galactic nuclei (AGN) at
high redshifts are important for constraining the AGN contribution to reionization and …

Building on the legacy of the Sloan Digital Sky Survey (SDSS-I and II), SDSS-III is a program
of four spectroscopic surveys on three scientific themes: dark energy and cosmological …

We demonstrate a novel technology that combines the power of the multi-object
spectrograph with the spatial multiplex advantage of an integral field spectrograph (IFS). The …

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 z≈ 6 type-1 quasar luminosity function (QLF), based on the Pan-STARRS1
(PS1) quasar survey. The PS1 sample includes 125 quasars at z≈ 5.7–6.2, with− 28≲ M …