Binary Quasars at High Redshift I: 24 New Quasar Pairs at z ~ 3-4 (2009)
Hennawi, Joseph F., Myers, Adam D., Shen, Yue, Strauss, Michael A., Djorgovski, S. G., Fan, Xiaohui, ...
The clustering of quasars on small scales yields fundamental constraints on models of quasar evolution and the buildup of supermassive black holes. This paper describes the first systematic survey to...
Binary Quasars at High Redshift II: Sub-Mpc Clustering at z ~ 3-4 (2009)
Shen, Yue, Hennawi, Joseph F., Shankar, Francesco, Myers, Adam D., Strauss, Michael A., Djorgovski, S. G., ...
We present measurements of the small-scale (0.1
The 2dF-SDSS LRG and QSO Survey: the QSO luminosity function at 0.4 (2009)
Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Strauss, Michael A., Myers, Adam D., ...
We present the QSO luminosity function of the completed 2dF-SDSS LRG and QSO (2SLAQ) survey, based on QSOs photometrically selected from Sloan Digital Sky Survey imaging data and then observed...
Eight-dimensional mid-infrared/optical Bayesian quasar selection (2009)
Richards, Gordon T., Deo, Rajesh P., Lacy, Mark, Myers, Adam D., Nichol, Robert C., Zakamska, Nadia L., ...
We explore the multidimensional, multiwavelength selection of quasars from mid-infrared (MIR) plus optical data, specifically from Spitzer-Infrared Array Camera (IRAC) and the Sloan Digital Sky...
Myers, Adam D, White, Martin, Ball, Nicholas M.
The use of photometric redshifts in cosmology is increasing. Often, however these photo-zs are treated like spectroscopic observations, in that the peak of the photometric redshift, rather than the...
Lundgren, Britt F., Brunner, Robert J., York, Donald G., Ross, Ashley J., Quashnock, Jean M., Myers, Adam D., ...
We analyze the cross-correlation of 2,705 unambiguously intervening Mg II (2796,2803A) quasar absorption line systems with 1,495,604 luminous red galaxies (LRGs) from the Fifth Data Release of the...
The 2dF-SDSS LRG and QSO Survey: the spectroscopic QSO catalogue (2009)
Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Sharp, Robert G., Bland-Hawthorn, Joss, ...
We present the final spectroscopic QSO catalogue from the 2dF-SDSS LRG (luminous red galaxy) and QSO (2SLAQ) survey. This is a deep, 18 < g < 21.85 (extinction corrected), sample aimed at probing in...
systems, NVidia Graphics Processing Units (GPUs), (2008)
Robert J. Brunner, Volodymyr V. Kindratenko, Adam D. Myers
Abstract-The objective of our research is to demonstrate the practical usage and orders of magnitude speedup of real-world applications by using alternative technologies to support high performance...
The 2dF-SDSS LRG and QSO Survey: The spectroscopic QSO catalogue (2008)
Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Sharp, Robert G., Bland-Hawthorn, Joss, ...
We present the final spectroscopic QSO catalogue from the 2dF-SDSS LRG and QSO (2SLAQ) Survey. This is a deep, 18
Eight-Dimensional Mid-Infrared/Optical Bayesian Quasar Selection (2008)
Richards, Gordon T., Deo, Rajesh P., Lacy, Mark, Myers, Adam D., Nichol, Robert C., Zakamska, Nadia L., ...
We explore the multidimensional, multiwavelength selection of quasars from mid-IR (MIR) plus optical data, specifically from Spitzer-IRAC and the Sloan Digital Sky Survey (SDSS). We apply modern...
Richards, Gordon T., Myers, Adam D., Gray, Alexander G., Riegel, Ryan N., Nichol, Robert C., Brunner, Robert J., ...
We present a catalog of 1,172,157 quasar candidates selected from the photometric imaging data of the Sloan Digital Sky Survey (SDSS). The objects are all point sources to a limiting magnitude of...
Mitrion-C Application Development on SGI Altix 350/RC100 (2008)
Kindratenko, Volodymyr V., Brunner, Robert J., Myers, Adam D.
This paper provides an evaluation of SGI RASCTM RC100 technology from a computational science software developer's perspective. A brute force implementation of a two-point angular correlation...
Ross, Ashley J., Brunner, Robert J., Myers, Adam D.
We present a novel technique to measure $\sigma_8$, by measuring the dependence of the second-order bias of a density field on $\sigma_8$ using two separate techniques. Each technique employs...
Ball, Nicholas M., Brunner, Robert J., Myers, Adam D., Strand, Natalie E., Alberts, Stacey L., Tcheng, David
We apply machine learning in the form of a nearest neighbor instance-based algorithm (NN) to generate full photometric redshift probability density functions (PDFs) for objects in the Fifth Data...
Robust Machine Learning Applied to Terascale Astronomical Datasets (2008)
Ball, Nicholas M., Brunner, Robert J., Myers, Adam D.
We present recent results from the LCDM (Laboratory for Cosmological Data Mining; http://lcdm.astro.uiuc.edu) collaboration between UIUC Astronomy and NCSA to deploy supercomputing cluster resources...
Combined analysis of the integrated Sachs-Wolfe effect and cosmological implications (2008)
Giannantonio, Tommaso, Scranton, Ryan, Crittenden, Robert G., Nichol, Robert C., Boughn, Stephen P., Myers, Adam D., ...
We present a global measurement of the integrated Sachs-Wolfe (ISW) effect obtained by cross-correlating all relevant large scale galaxy data sets with the cosmic microwave background radiation map...
The 2dF-SDSS LRG and QSO survey : QSO clustering and the L-z degeneracy (2008)
Da Angela, Jose A., Shanks, Tom, Croom, Scott M., Weilbacher, Peter M., Brunner, Robert J., Couch, Warrick J., ...
We combine the quasi-stellar object (QSO) samples from the 2dF QSO Redshift Survey (2QZ) and the 2dF-Sloan Digital Sky Survey luminous red galaxy (LRG) and QSO Survey (2dF-SDSS LRG and QSO, hereafter...
The 2dF-SDSS LRG and QSO survey : QSO clustering and the L-z degeneracy (2008)
Da Angela, Jose A., Shanks, Tom, Croom, Scott M., Weilbacher, Peter M., Brunner, Robert J., Couch, Warrick J., ...
We combine the quasi-stellar object (QSO) samples from the 2dF QSO Redshift Survey (2QZ) and the 2dF-Sloan Digital Sky Survey luminous red galaxy (LRG) and QSO Survey (2dF-SDSS LRG and QSO, hereafter...
The 2dF-SDSS LRG and QSO survey : QSO clustering and the L-z degeneracy (2008)
Da Angela, Jose A., Shanks, Tom, Croom, Scott M., Weilbacher, Peter M., Brunner, Robert J., Couch, Warrick J., ...
We combine the quasi-stellar object (QSO) samples from the 2dF QSO Redshift Survey (2QZ) and the 2dF-Sloan Digital Sky Survey luminous red galaxy (LRG) and QSO Survey (2dF-SDSS LRG and QSO, hereafter...
The 2dF-SDSS LRG and QSO survey : QSO clustering and the L-z degeneracy (2008)
Da Angela, Jose A., Shanks, Tom, Croom, Scott M., Weilbacher, Peter M., Brunner, Robert J., Couch, Warrick J., ...
We combine the quasi-stellar object (QSO) samples from the 2dF QSO Redshift Survey (2QZ) and the 2dF-Sloan Digital Sky Survey luminous red galaxy (LRG) and QSO Survey (2dF-SDSS LRG and QSO, hereafter...
The 2dF-SDSS LRG and QSO Survey: the spectroscopic QSO catalogue (2008)
Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Sharp, Robert G., Bland-Hawthorn, Joss, ...
We present the final spectroscopic QSO catalogue from the 2dF-SDSS LRG (luminous red galaxy) and QSO (2SLAQ) survey. This is a deep, 18 < g < 21.85 (extinction corrected), sample aimed at...
The 2dF-SDSS LRG and QSO survey : QSO clustering and the L-z degeneracy (2008)
Da Angela, Jose A., Shanks, Tom, Croom, Scott M., Weilbacher, Peter M., Brunner, Robert J., Couch, Warrick J., ...
We combine the quasi-stellar object (QSO) samples from the 2dF QSO Redshift Survey (2QZ) and the 2dF-Sloan Digital Sky Survey luminous red galaxy (LRG) and QSO Survey (2dF-SDSS LRG and QSO, hereafter...
The 2dF-SDSS LRG and QSO Survey: the spectroscopic QSO catalogue (2008)
Croom, Scott M., Richards, Gordon T., Shanks, Tom, Boyle, Brian J., Sharp, Robert G., Bland-Hawthorn, Joss, ...
We present the final spectroscopic QSO catalogue from the 2dF-SDSS LRG (luminous red galaxy) and QSO (2SLAQ) survey. This is a deep, 18 < g < 21.85 (extinction corrected), sample aimed at...
Strand, Natalie E., Brunner, Robert J., Myers, Adam D.
We explore how the local environment is related to the redshift, type, and luminosity of active galactic nuclei (AGN). Recent simulations and observations are converging on the view that the extreme...
Developing and Deploying Advanced Algorithms to Novel Supercomputing Hardware (2007)
Brunner, Robert J., Kindratenko, Volodymyr V., Myers, Adam D.
The objective of our research is to demonstrate the practical usage and orders of magnitude speedup of real-world applications by using alternative technologies to support high performance computing....
Dynamic load-balancing on multi-FPGA systems: a case study (2007)
Kindratenko, Volodymyr V., Brunner, Robert J., Myers, Adam D.
In this case study, we investigate the impact of workload balance on the performance of multi-FPGA codes. We start with an application in which two distinct kernels run in parallel on two SRC-6 MAP...
Robust Machine Learning Applied to Terascale Astronomical Datasets (2007)
Ball, Nicholas M., Brunner, Robert J., Myers, Adam D.
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 robust classifications...
Quasar Clustering at $25\kpch$ from a Complete Sample of Binaries (2007)
Myers, Adam D., Richards, Gordon T., Brunner, Robert J., Schneider, Donald P., Strand, Natalie E., Hall, Patrick B., ...
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 sets of...
Ross, Ashley J., Brunner, Robert J., Myers, Adam D.
We present estimates of the N-point galaxy, area-averaged, angular correlation functions $\bar{\omega}_{N}$($\theta$) for $N$ = 2,...,7 for galaxies from the fifth data release of the Sloan Digital...
Ball, Nicholas M., Brunner, Robert J., Myers, Adam D., Strand, Natalie E., Alberts, Stacey L., Tcheng, David, ...
We apply instance-based machine learning in the form of a k-nearest neighbor algorithm to the task of estimating photometric redshifts for 55,746 objects spectroscopically classified as quasars in...
Myers, Adam D., Brunner, Robert J., Nichol, Robert C., Richards, Gordon T., Schneider, Donald P., Bahcall, Neta A.
Using ~300,000 photometrically classified quasars, by far the largest quasar sample ever used for such analyses, we study the redshift and luminosity evolution of quasar clustering on scales of ~50...
Myers, Adam D., Brunner, Robert J., Richards, Gordon T., Nichol, Robert C., Schneider, Donald P., Bahcall, Neta A.
We study quasar clustering on small scales, modeling clustering amplitudes using halo-driven dark matter descriptions. From 91 pairs on scales 2, than at z < 2, at the $2.0\sigma$ level. However, as...
The Co-Formation of Spheroids and Quasars Traced in their Clustering (2006)
Hopkins, Philip F., Lidz, Adam, Hernquist, Lars, Coil, Alison L., Myers, Adam D., Cox, Thomas J., ...
We compare observed clustering of quasars and galaxies as a function of redshift, mass, luminosity, & color/morphology, to constrain models of quasar fueling and spheroid-BH co-evolution. High...
A high redshift detection of the integrated Sachs-Wolfe effect (2006)
Giannantonio, Tommaso, Crittenden, Robert G., Nichol, Robert C., Scranton, Ryan, Richards, Gordon T., Myers, Adam D., ...
We present evidence of a large angle correlation between the cosmic microwave background measured by WMAP and a catalog of photometrically detected quasars from the SDSS. The observed cross...
Ball, Nicholas M., Brunner, Robert J., Myers, Adam D., Tcheng, David
We provide classifications for all 143 million non-repeat photometric objects in the Third Data Release of the Sloan Digital Sky Survey (SDSS) using decision trees trained on 477,068 objects with...
Ross, Ashley J., Brunner, Robert J., Myers, Adam D.
We present estimates of the N-point galaxy area-averaged angular correlation functions wN for N = 2,...,7 from the third data release of the Sloan Digital Sky Survey (SDSS). The sample was selected...
First Measurement of the Clustering Evolution of Photometrically-Classified Quasars (2005)
Myers, Adam D., Brunner, Robert J., Richards, Gordon T., Nichol, Robert C., Schneider, Donald P., Berk, Daniel E. Vanden, ...
We present new measurements of the quasar autocorrelation from a sample of \~80,000 photometrically-classified quasars taken from SDSS DR1. We find a best-fit model of $\omega(\theta) =...
Detection of Cosmic Magnification with the Sloan Digital Sky Survey (2005)
Scranton, Ryan, Menard, Brice, Richards, Gordon T., Nichol, Robert C., Myers, Adam D., Jain, Bhuvnesh, ...
We present an 8 sigma detection of cosmic magnification measured by the variation of quasar density due to gravitational lensing by foreground large scale structure. To make this measurement we used...
QSO lensing magnification associated with galaxy groups (2004)
Guimarães, Antonio C. C., Myers, Adam D., Shanks, Tom
We simulated both the matter and light (galaxy) distributions in a wedge of the universe and calculated the gravitational lensing magnification caused by the mass along the line of sight of galaxies...