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60 papers · 2 filters
The Cut & Enhance method : selecting clusters of galaxies from the SDSS commissioning data
Tomotsugu Goto, Maki Sekiguchi, Robert C. Nichol +8
We describe an automated method, the Cut & Enhance method (CE) for detecting clusters of galaxies in multi-color optical imaging surveys. This method uses simple color cuts, combin…
LOTIS, Super-LOTIS, SDSS and Tautenburg Observations of GRB 010921
H. S. Park, G. G. Williams, D. H. Hartmann +36
We present multi-instrument optical observations of the High Energy Transient Explorer (HETE-2)/Interplanetary Network (IPN) error box of GRB 010921. This event was the first gamma…
Cosmic Microwave Background Anisotropy Measurement From Python V
K. Coble, S. Dodelson, M. Dragovan +5
We analyze observations of the microwave sky made with the Python experiment in its fifth year of operation at the Amundsen-Scott South Pole Station in Antarctica. After modeling t…
The Ghost of Sagittarius and Lumps in the Halo of the Milky Way
Heidi Jo Newberg, Brian Yanny, Constance M. Rockosi +16
We identify new structures in the halo of the Milky Way Galaxy from positions, colors and magnitudes of five million stars detected in the Sloan Digital Sky Survey. Most of these s…
Ultra-High Energy Cosmic Rays: The Annihilation of Super-Heavy Relics
Pasquale Blasi, Rainer Dick, Edward W. Kolb
We investigate the possibility that ultra-high energy cosmic rays (UHECRs) originate from the annihilation of relic superheavy (SH) dark matter in the Galactic halo. In order to fi…
Enhanced signal of astrophysical tau neutrinos propagating through Earth
John F. Beacom, Patrick Crotty, Edward W. Kolb
Earth absorbs $\nue$ and $\numu$ of energies above about 100 TeV. As is well-known, although $\nutau$ will also disappear through charged-current interactions, the $\nutau$ flux wi…
Higher Order Moments of the Angular Distribution of Galaxies from Early SDSS Data
István Szapudi, Joshua A. Frieman, Roman Scoccimarro +13
We present initial results for counts in cells statistics of the angular distribution of galaxies in early data from the Sloan Digital Sky Survey (SDSS). We analyze a rectangular s…
SDSS J124602.54+011318.8: A Highly Luminous Optical Transient at z=0.385
D. E. Vanden Berk, B. C. Lee, B. C. Wilhite +13
We report the discovery of a highly luminous optical transient (OT), SDSS J124602.54+011318.8, associated with a galaxy at a redshift of 0.385. In this paper we consider the possib…
The Angular Clustering of Galaxy Pairs
Leopoldo Infante, Michael A. Strauss, Neta A. Bahcall +13
We identify close pairs of galaxies from 278 deg^2 of Sloan Digital Sky Survey commissioning imaging data. The pairs are drawn from a sample of 330,041 galaxies with 18 < r^* < 20.…
The Sloan Digital Sky Survey Quasar Catalog I. Early Data Release
Donald P. Schneider, Gordon T. Richards, Xiaohui Fan +9
We present the first edition of the Sloan Digital Sky Survey (SDSS) Quasar Catalog. The catalog consists of the 3814 objects (3000 discovered by the SDSS) in the initial SDSS publi…
Cosmic Microwave Background Anisotropies
Wayne Hu, Scott Dodelson
Cosmic microwave background (CMB) temperature anisotropies have and will continue to revolutionize our understanding of cosmology. The recent discovery of the previously predicted…
The Alignment Effect of Brightest Cluster Galaxies in the SDSS
Rita S. J. Kim, Jim Annis, Michael A. Strauss +5
One of the most vital observational clues for unraveling the origin of Brightest Cluster Galaxies (BCG) is the observed alignment of the BCGs with their host cluster and its surrou…
The UCSD HIRES/KeckI Damped Lya Abundance Database: I. The Data
Jason X. Prochaska, Arthur M. Wolfe, David Tytler +6
We present new chemical abundance measurements of 16 damped Lya systems at z>1.5 and update our previous abundance analyses. The entire database presented here was derived from HIR…
Early-type galaxies in the SDSS
M. Bernardi, R. K. Sheth, J. Annis +28
A sample of nearly 9000 early-type galaxies, in the redshift range 0.01<z<0.3, was selected from the Sloan Digital Sky Survey using morphological and spectral criteria. The sample…
Cataclysmic Variables from SDSS I. The First Results
P. Szkody, S. F. Anderson, M. Agueros +27
The commissioning year of the Sloan Digital Sky Survey has demonstrated that many cataclysmic variables have been missed in previous surveys with brighter limits. We report the ide…
Detecting Clusters of Galaxies in the Sloan Digital Sky Survey I : Monte Carlo Comparison of Cluster Detection Algorithms
Rita S. J. Kim, Jeremy V. Kepner, Marc Postman +15
We present a comparison of three cluster finding algorithms from imaging data using Monte Carlo simulations of clusters embedded in a 25 deg^2 region of Sloan Digital Sky Survey (S…
Scale Dependent Spectral Index in Slow Roll Inflation
Scott Dodelson, Ewan Stewart
Recent observations suggest that the spectral index of the primordial perturbations is very close to unity, as expected in models of slow roll inflation. It is still possible for s…
Evidence for Reionization at z ~ 6: Detection of a Gunn-Peterson Trough in a z=6.28 Quasar
Robert H. Becker, Xiaohui Fan, Richard L. White +27
We present moderate resolution Keck spectroscopy of quasars at z=5.82, 5.99 and 6.28, discovered by the Sloan Digital Sky Survey (SDSS). We find that the Ly Alpha absorption in the…
Small Scale Anisotropies of UHECRs from Super-Heavy Halo Dark Matter
P. Blasi, R. K. Sheth
The decay of very heavy metastable relics of the Early Universe can produce ultra-high energy cosmic rays (UHECRs) in the halo of our own Galaxy. In this model, no Greisen-Zatsepin…
Spectroscopic Target Selection for the Sloan Digital Sky Survey: The Luminous Red Galaxy Sample
D. J. Eisenstein, J. Annis, J. E. Gunn +25
We describe the target selection and resulting properties of a spectroscopic sample of luminous, red galaxies (LRG) from the imaging data of the Sloan Digital Sky Survey (SDSS). Th…
Dark Energy and the New Cosmology
Michael S. Turner
A successor to the standard hot big-bang cosmology is emerging. It greatly extends the highly successful hot big-bang model. A key element of the New Standard Cosmology is dark ene…
New insights on the Draco dwarf spheroidal galaxy from SDSS: a larger radius and no tidal tails
Michael Odenkirchen, Eva K. Grebel, Daniel Harbeck +3
We have investigated the spatial extent and structure of the Draco dwarf spheroidal galaxy using deep wide-field multicolor CCD photometry from the Sloan Digital Sky Survey (SDSS).…
WIMPS Are Stronger When They Stick Together
Angela V. Olinto, Pasquale Blasi, Craig Tyler
Weakly interacting massive particles (WIMPs) remain the strongest candidates for the dark matter in the Universe. If WIMPs are the dark matter, they will form galactic halos accord…
Chaos, ergodicity, and the thermodynamics of lower-dimensional Hamiltonian systems
Henry E. Kandrup, Ioannis V. Sideris, C. L. Bohn
This paper uses the assumptions of ergodicity and a microcanonical distribution to compute estimates of the largest Lyapunov exponents in lower-dimensional Hamiltonian systems. Tha…