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55 papers · 2 filters
Colors of 2625 Quasars at 0<z<5 Measured in the Sloan Digital Sky Survey Photometric System
Gordon T. Richards, Xiaohui Fan, Donald P. Schneider +3
We present an empirical investigation of the colors of quasars in the Sloan Digital Sky Survey (SDSS) photometric system. The sample studied includes 2625 quasars with SDSS photome…
Detection of massive tidal tails around the globular cluster Pal 5 with SDSS commissioning data
M. Odenkirchen, E. K. Grebel, C. M. Rockosi +17
We report the discovery of two well-defined tidal tails emerging from the sparse remote globular cluster Palomar 5. These tails stretch out symmetrically to both sides of the clust…
High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data V. Hobby-Eberly Telescope Observations
Donald P. Schneider, Xiaohui Fan, Michael A. Strauss +5
We report the discovery of 27 quasars with redshifts between 3.58 and 4.49. The objects were identified as high-redshift candidates based on their colors in Sloan Digital Sky Surve…
Continuum Variability of Active Galactic Nuclei in the Optical-UV Range
Dario Trevese, Richard G. Kron, Alessandro Bunone
The variability of the continuum spectral energy distribution has been analyzed for a complete magnitude-limited sample of quasars in Selected Area 57, observed at two epochs in th…
The Luminosity Function of Galaxies in SDSS Commissioning Data
SDSS Collaboration, M. R. Blanton
During commissioning observations, the Sloan Digital Sky Survey (SDSS) has produced one of the largest existing galaxy redshift samples selected from CCD images. Using 11,275 galax…
SDSS-RASS: Next Generation of Cluster-Finding Algorithms
R. Nichol, C. Miller, A. Connolly +17
We outline here the next generation of cluster-finding algorithms. We show how advances in Computer Science and Statistics have helped develop robust, fast algorithms for finding c…
On the streaming motions of haloes and galaxies
Ravi K. Sheth, Antonaldo Diaferio, Lam Hui +1
A simple model of how objects of different masses stream towards each other as they cluster gravitationally is described. The model shows how the mean streaming velocity of dark ma…
Optical and Infrared Colors of Stars Observed by 2MASS and SDSS
K. Finlator, Z. Ivezic, M. Strauss +4
We discuss optical and infrared photometric properties of stars matched in the Two Micron All Sky Survey (2MASS) and the Sloan Digital Sky Survey (SDSS) commissioning data for 50 d…
Dark matter distribution in the universe and ultra-high energy cosmic rays
Pasquale Blasi
Two of the greatest mysteries of modern physics are the origin of the dark matter in the universe and the nature of the highest energy particles in the cosmic ray spectrum. We disc…
The First Hour of Extra-galactic Data of the Sloan Digital Sky Survey Spectroscopic Commissioning: The Coma Cluster
SDSS Collaboration, Francisco J. Castander, Robert C. Nichol +6
On 26 May 1999, one of the Sloan Digital Sky Survey (SDSS) fiber-fed spectrographs saw astronomical first light. This was followed by the first spectroscopic commissioning run duri…
Black Hole Formation in Core-Collapse Supernovae and Time-of-Flight Measurements of the Neutrino Masses
J. F. Beacom, R. N. Boyd, A. Mezzacappa
Early black hole formation in core-collapse supernovae may be triggered by mass accretion or a change in the high-density equation of state. We consider the possibility that black…
Constraints on Galaxy Bias, Matter Density, and Primordial Non--Gausianity from the PSCz Galaxy Redshift Survey
Hume A. Feldman, Joshua A. Frieman, J. N. Fry +1
We compute the bispectrum for the \IRAS PSCz catalog and find that the galaxy distribution displays the characteristic signature of gravity. Assuming Gaussian initial conditions, w…
Big-Bang Nucleosynthesis Predictions for Precision Cosmology
Scott Burles, Kenneth M. Nollett, Michael S. Turner
The determination of the primeval deuterium abundance has opened a precision era in big-bang nucleosynthesis (BBN), making accurate predictions more important than ever before. We…
The GZK Feature in our Neighborhood of the Universe
Michael Blanton, Pasquale Blasi, Angela V. Olinto
We calculate numerically the spectrum of ultra-high energy cosmic rays on Earth assuming that their sources are distributed in space like the observed galaxies. We use the CfA2 and…
High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data IV: Luminosity Function from the Fall Equatorial Stripe Sampl
X. Fan, M. A. Strauss, D. P. Schneider +7
This is the fourth paper in a series aimed at finding high-redshift quasars from five-color imaging data taken along the Celestial Equator by the SDSS. during its commissioning pha…
High-Redshift Quasars Found in Sloan Digital Sky Survey Commissioning Data III: A Color Selected Sample at i^*<20 in the Fall Equatorial Stripe
X. Fan, M. A. Strauss, G. T. Richards +7
This is the third paper in a series aimed at finding high-redshift quasars from five-color (u'g'r'i'z') imaging data taken along the Celestial Equator by the SDSS during its commis…
Linear and nonlinear contributions to pairwise peculiar velocities
Ravi K. Sheth, Lam Hui, Antonaldo Diaferio +1
We write the correlation function of dark matter particles, xi(r), as the sum of two terms - one which accounts for nonlinear evolution, and dominates on small scales, and another…
Peculiar velocities of galaxies and clusters
Ravi K. Sheth, Antonaldo Diaferio
We present a simple model for the shape of the distribution function of galaxy peculiar velocities. We show how both nonlinear and linear theory terms combine to produce a distribu…
The Distribution of [OII] Equivalent Widths of LCRS Galaxies
Michael Blanton, Huan Lin
We present a simple functional form for the joint distribution of R-band luminosity and [OII] 3727 emission-line equivalent widths of galaxies, and show that this form is a good fi…
Discovery of a Close Pair of z = 4.25 Quasars from the Sloan Digital Sky Survey
Donald P. Schneider, Xiaohui Fan, Michael A. Strauss +17
We report the discovery of a pair of z = 4.25 quasars with a separation of 33 arcseconds. The brighter of the two objects was identified as a high-redshift quasar candidate from Sl…
The non-thermal radiation - Cluster merger connection
Pasquale Blasi
There is compelling evidence that at least some clusters of galaxies are powerful sources of non-thermal radiation. In all cases where this radiation has been detected, a general t…
What Is The BBN Prediction for the Baryon Density and How Reliable Is It?
Scott Burles, Kenneth M. Nollett, Michael S. Turner
Together, the standard theory of big-bang nucleosynthesis (BBN) and the primeval deuterium abundance now very precisely peg the baryon density. Based upon our analysis of the deute…
Prospects for Indirect Detection of Neutralino Dark Matter
Jonathan L. Feng, Konstantin T. Matchev, Frank Wilczek
Dark matter candidates arising in models of particle physics incorporating weak scale supersymmetry may produce detectable signals through their annihilation into neutrinos, photon…
Precision Cosmology and the Density of Baryons in the Universe
M. Kaplinghat, M. S. Turner
Big-bang Nucleosynthesis (BBN) and Cosmic Microwave Background (CMB) anisotropy measurements give independent, accurate measurements of the baryon density and can test the framewor…