Astrophysics Seminars

ABSTRACT: Reionization was the last major phase transition for most of the normal matter in the universe, and a landmark event in the early phases of galaxy formation. Lyman alpha emission from galaxies provides a good tool for probing...

ABSTRACT: Stacking of data from the Planck satellite allows the mean Sunyaev-Zeldovich decrement of dark matter halos to be measured over a range of more than two orders of magnitude in mass. Surprisingly, the results indicate that the amount of...

ABSTRACT: Saturn's regular satellites exhibit a number of orbital anomalies, including the relatively high eccentricity of Titan, large inclination of Iapetus and surprisingly evolved Titan-Hyperion resonance. Recently, Lainey et al.(2012)...

ABSTRACT: Magnetic forces in the diffuse interstellar medium are much greater than the forces due to self-gravitation, thereby precluding star formation there. Historically, it has been conjectured that ambipolar diffusion, in which neutral...

ABSTRACT: Eclipsing systems are famous for providing abundant opportunities to study the basic properties of stars and planets --- but eclipsing systems with more than two bodies present truly extraordinary opportunities. This is because non...

ABSTRACT: Radiation pressure on dust grains may be an important mechanism in driving winds in a wide variety of astrophysical environments, from the envelopes of red giants to young star clusters to starburst galaxies to the tori around AGN. I...