The quest for binary and dual supermassive black holes (SMBHs) at the dawn of the multi-
messenger era is compelling. Detecting dual active galactic nuclei (AGN)–active SMBHs at …

We review the physical properties of nearby, relatively luminous galaxies, using results from
newly available massive data sets together with more detailed observations. First, we …

We use the IllustrisTNG hydrodynamical simulations to show how the fractions of quenched
galaxies vary across different environments and cosmic time, and to quantify the role AGN …

We present the results of a Palomar Transient Factory (PTF) archival search for blue
transients that lie in the magnitude range between" normal" core-collapse and …

We have updated and extended our semi-analytic galaxy formation modelling capabilities
and applied them simultaneously to the stored halo/subhalo merger trees of the Millennium …

We point out a natural mechanism for quenching of star formation in early-type galaxies
(ETGs). It automatically links the color of a galaxy with its morphology and does not require …

We measure spectral indexes for 1823 galaxies in the Canadian Network for Observational
Cosmology 1 (CNOC1) sample of 15 X-ray luminous clusters at 0.18< z< 0.55 to investigate …

We describe the algorithm for selecting quasar candidates for optical spectroscopy in the
Sloan Digital Sky Survey. Quasar candidates are selected via their non-stellar colors in" …

We present in this paper a detailed analysis of the effect of environment on the star formation
activity of galaxies within the Early Data Release (EDR) of the Sloan Digital Sky Survey …

Galaxy mergers trigger both star formation and accretion on to the central supermassive
black hole. As a result of subsequent energetic feedback processes, it has long been …