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Astrometry with the Keck-Interferometer: the ASTRA project and its science
Jorg-Uwe Pott, Julien Woillez, Rachel L. Akeson +22
The sensitivity and astrometry upgrade ASTRA of the Keck Interferometer is introduced. After a brief overview of the underlying interferometric principles, the technology and conce…
Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits
A. M. Ghez, S. Salim, N. N. Weinberg +10
We report new precision measurements of the properties of our Galaxy's supermassive black hole. Based on astrometric (1995-2007) and radial velocity (2000-2007) measurements from t…
Nonlinear Saturation of g-modes in Proto-Neutron Stars: Quieting the Acoustic Engine
Nevin N. Weinberg, Eliot Quataert
According to Burrows et al.'s acoustic mechanism for core-collapse supernova explosions, the primary, l=1, g-mode in the core of the proto-neutron star is excited to an energy of ~…