A significant fraction of nearby galaxies show evidence of weak nuclear activity unrelated to
normal stellar processes. Recent high-resolution, multiwavelength observations indicate that …

There is a broad consensus that accretion onto supermassive black holes and consequent
jet formation power the observed emission from active galactic nuclei (AGNs). However …

The X‐ray background can be used to constrain the accretion history of supermassive black
holes (SMBHs) in active galactic nuclei (AGN), with the SMBH mass density related to the …

The radiative efficiency of active galactic nucleus (AGN) is commonly estimated based on
the total mass accreted and the total AGN light emitted per unit volume in the universe …

Using≈ 190 000 spectra from the 17th data release of the Sloan Digital Sky Survey (SDSS),
we investigate the ultraviolet emission line properties in z≈ 2 quasars. Specifically, we …

Bolometric corrections are used in quasar studies to quantify total energy output based on a
measurement of a monochromatic luminosity. First, we enumerate and discuss the practical …

We present a new measurement of the optical quasar luminosity function (QLF), using data
from the Sloan Digital Sky Survey-III: Baryon Oscillation Spectroscopic Survey (SDSS-III …

Stars form in galaxies, from gas that has been accreted from the intergalactic medium.
Simulations have shown that recycling of gas—the reaccretion of gas that was previously …

We have produced the next generation of quasar spectral energy distributions (SEDs),
essentially updating the work of Elvis et al. by using high-quality data obtained with several …

We present high spectral resolution Very Large Telescope observations of the broad
absorption line quasar SDSS J0318− 0600. This high-quality data set allows us to extract …