I will summarize the history of IGM temperature measurements
from the Lyman-alpha forest as well as the theory for the IGM
temperature after reionization. I will show that the simplest
theory for thermal evolution, which has little parametric...
Measurements of the Cosmic Microwave Background radiation have
taught us a great deal about the origins and content of the
universe, but there is still more information to be extracted,
teaching us about the energetic moments in the early
universe...
ABSTRACT ADDED - Many high-energy astrophysical sources —
pulsars, PWN, magnetars, GRBs, and AGN (including blazar) jets —
produce bright bursts of gamma-ray emission, often featuring rapid
variability and nonthermal spectra. This calls for a...
The heaviest elements in the periodic table are synthesized
through the r-process, but the astrophysical site for r-process
nucleosynthesis is still unknown. The major current candidates are
ordinary core-collapse supernovae and neutron star merger...
Recent observations by the Kepler space telescope have led to
the discovery of more than 4000 exoplanet candidates consisting of
many systems with Earth- to Neptune-sized objects that reside well
inside the orbit of Mercury, around their respective...
The talk begins in 2005, with the unexpected discovery that
massive early-type galaxies were extremely compact at redshifts
z~2. It is now thought that the remarkable size growth of these
galaxies from z=2 to z=0 is largely due to minor mergers;
the...
In the last few years of the lives of massive stars, fusion in
the core of the star produces a nuclear power that greatly exceeds
the Eddington luminosity. This drives vigorous convection in
numerous core and shell burning phases. I describe the...
Environment plays a major in role in the evolution of galaxies.
This is particularly true of low mass dwarf galaxies where more
massive galaxies dramatically affect the local gravitational
potential. Isolated galaxies offer a unique test bed for...