235 citations
- University of Illinois Urbana-ChampaignUS31 papers
- Pennsylvania State UniversityUS7 papers
- Drexel UniversityUS4 papers
- Princeton UniversityUS4 papers
- California Institute of TechnologyUS3 papers
- Fermi National Accelerator LaboratoryUS3 papers
- University of ChicagoUS3 papers
- University of Illinois SystemUS3 papers
- University of PortsmouthGB3 papers
- Institut d'Astrophysique de ParisFR2 papers
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- Los Alamos National LaboratoryUS2 papers
14 papers · 1 filter
On the variability of quasars: a link between Eddington ratio and optical variability?
B. C. Wilhite, R. J. Brunner, C. J. Grier +2
Repeat scans by the Sloan Digital Sky Survey (SDSS) of a 278 square degree stripe along the Celestial equator have yielded an average of over 10 observations each for nearly 8,000…
A Direct Multigrid Poisson Solver for Oct-Tree Adaptive Meshes
P. M. Ricker
We describe a finite-volume method for solving the Poisson equation on oct-tree adaptive meshes using direct solvers for individual mesh blocks. The method is a modified version of…
Robust Machine Learning Applied to Terascale Astronomical Datasets
Nicholas M. Ball, Robert J. Brunner, Adam D. Myers
We present recent results from the Laboratory for Cosmological Data Mining (http://lcdm.astro.uiuc.edu) at the National Center for Supercomputing Applications (NCSA) to provide rob…
Numerical Simulations of Oscillating Soliton Stars: Excited States in Spherical Symmetry and Ground State Evolutions in 3D
Jayashree Balakrishna, Ruxandra Bondarescu, Gregory Daues +1
Excited state soliton stars are studied numerically for the first time. The stability of spherically symmetric S-branch excited state oscillatons under radial perturbations is inve…
Quasar Clustering at $25\kpch$ from a Complete Sample of Binaries
Adam D. Myers, Gordon T. Richards, Robert J. Brunner +5
We present spectroscopy of binary quasar candidates selected from Data Release 4 of the Sloan Digital Sky Survey (SDSS DR4) using Kernel Density Estimation (KDE). We present 27 new…
The Effect of Variability on the Estimation of Quasar Black Hole Masses
B. C. Wilhite, R. J. Brunner, D. P. Schneider +1
We investigate the time-dependent variations of ultraviolet (UV) black hole mass estimates of quasars in the Sloan Digital Sky Survey (SDSS). From SDSS spectra of 615 high-redshift…