Video Lectures

Massive black holes, weighing millions to billions of solar masses, inhabit the centers of today's galaxies. Black hole masses typically scale with properties of their hosts, such as bulge mass and velocity dispersion. The progenitors of these black...

Gaia is a perfect halo explorer. It makes up for a relatively shallow depth with an array of features not available to other surveys/telescopes. These include stable photometry, impeccable star/galaxy separation and resilience to artefacts, not to...

Although it is a crucial pat of our cosmic timeline, Cosmic Dawn—when the first stars and galaxies formed and systematically reionized the intergalactic medium—remains relatively unexplored. By tracing the distribution and state of neutral hydrogen...

Accreting black holes are observed in a large variety of systems in astronomy: active galactic nuclei, X-ray binaries, tidal disruption events, gamma-ray bursts. While analytical one-dimensional models have been enormously useful for understanding...

Magnetars produce beautiful fireworks in x-rays and gamma-rays: small, large, and stupendous flares, fast quasi-periodic oscillations (QPOs), as well as transient increases of their luminosities on timescales of months to years. How the release of...

The distribution of planetary companion masses, as well as the integrated surface density of companions over fixed mass ranges provide a wealth of information concerning planet formation processes and subsequent dynamical evolution of planetary...

Feedback from a central supermassive black hole is an essential component of galaxy evolution models. Without it, those models cannot produce realistic massive galaxies and galaxy clusters. However, the black-hole feedback mechanism remains...