▪ Abstract A large collective effort to study the variability of active galactic nuclei (AGN) over
the past decade has led to a number of fundamental results on radio-quiet AGN and blazars …

Collimated outflows (jets) appear to be a ubiquitous phenomenon associated with the
accretion of material onto a compact object. Despite this ubiquity, many fundamental physics …

The Large Area Telescope (LAT) on board the Fermi Gamma Ray Space Telescope,
launched on 2008 June 11, provides unprecedented sensitivity in the γ-ray band (20 MeV to …

We collect data at well-sampled frequencies from the radio to the γ-ray range for the
following three complete samples of blazars: the Slew survey, the 1-Jy samples of BL Lacs …

We explore the evolution in power of black holes of all masses, and their associated jets,
within the scheme of an accretion rate-dependent state transition. Below a critical value of …

We present the discovery of seven quasars at z> 5.7, selected from∼ 2000 deg 2 of
multicolor imaging data of the Sloan Digital Sky Survey. The new quasars have redshifts z …

We present simultaneous Planck, Swift, Fermi, and ground-based data for 105 blazars
belonging to three samples with flux limits in the soft X-ray, hard X-ray, and γ-ray bands, with …

We performed an observational program with the X-ray satellite BeppoSAX, to study objects
with extreme synchrotron peak frequencies (keV). Of the seven sources observed, five …

Abstract The Fundamental Plane of black hole activity is a relation between X-ray luminosity,
radio luminosity and black hole mass for hard-state Galactic black holes and their …

We present a model of the spectra of gamma-ray emitting blazars in which a single
homogeneous emission region both emits synchrotron photons directly and scatters them to …