Publications list
Abstract
The Void Spectrum and Properties of Void Galaxies in the SDSS
Published Dec 2004
Bulletin of the American Astronomical Society, 36, 1496 - 1496
205th Meeting of the American Astronomical Society , 09 Jan 2005–13 Jan 2005, San Diego, California, United States
We measure the distribution of void sizes in the SDSS using an objective void finding algorithm and statistically characterize the spectrum of voids by measuring the Void Probability Function for volume-limited samples of this survey. These void statistics provide powerful constraints on models that describe the relationship between luminous and dark matter. The properties of galaxies in voids provide further contraints on galaxy formation models: On average, galaxies in the rarified environments of voids exhibit bluer colors, higher specific star formation rates, lower dust content, and more disk-like morphology than objects in denser regions. This trend persists in comparisons of samples in low vs. high-density regions with similar luminosity and morphology. Large-scale modulation of the halo mass function partially explains this dependence of galaxy evolution on environment.
Abstract
Beowulf Analysis Symbolic INterface (BASIN)
Published Dec 2003
Bulletin of the American Astronomical Society, 35, 1209 - 1209
203rd Meeting of the American Astronomical Society , 04 Jan 2004–08 Jan 2004, Atlanta, Georgia, United States
We are developing an integrated suite of parallelized analysis and visualization tools, designed to run on large Beowulf-class clusters of computers. Using efficient and scalable algorithms, this toolkit will harness the low-cost computing power of these parallel systems to allow real time analysis and visualization of data sets in the multi-terabyte to petabyte range. Software components for data input/output, transformations, statistical analysis, and 3D visualization will communicate and operate seamlessly within a symbolic user interface.