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astro-ph1997
The Evolution of Galactic Disks
Shude Mao, H. J. Mo, Simon D. M. White
We use recent observations of high-redshift galaxies to study the evolution of galactic disks over the redshift range 0<z<1. The data are inconsistent with models in which disks we…
astro-ph1997
Global stability and the mass-to-light ratio of galactic disks
D. Syer, Shude Mao, H. J. Mo
We examine the global stability of an exponential stellar disk embedded in a dark matter halo and constrain the mass-to-light ratio of observed disks in the I-band, Y_I. Assuming o…
astro-ph1997
Properties of Point Mass Lenses On A Regular Polygon and The Problem of Maximum Number of Images
S. Mao, A. O. Petters, H. J. Witt
We study the critical curves, caustics, and multiple imaging due to one of the simplest many-body gravitational lens configurations: equal-mass point masses on the vertices of a re…