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41 papers · 2 filters
Clusters and Superclusters in the Sloan Digital Sky Survey
J. Einasto, G. H"utsi, M. Einasto +5
Two-dimensional high-resolution density field of galaxies of the Early Data Release of the Sloan Digital Sky Survey with a smoothing lengths 0.8 h^{-1} Mpc is applied to extract cl…
The New Cosmology: Mid-term Report Card for Inflation
Michael S. Turner
Inflation has been the driving idea in cosmology for two decades and is a pillar of the New Cosmology. The inflationary paradigm has now passed its first round of significant tests…
The overdensities of galaxy environments as a function of luminosity and color
David W. Hogg, Michael R. Blanton, Daniel J. Eisenstein +9
We study the mean environments of galaxies in the Sloan Digital Sky Survey as a function of rest-frame luminosity and color. Overdensities in galaxy number are estimated in $8 h^{-…
Average spectra of massive galaxies in the SDSS
Daniel J. Eisenstein, David W. Hogg, Masataka Fukugita +17
We combine Sloan Digital Sky Survey spectra of 22,000 luminous, red, bulge-dominated galaxies to get high S/N average spectra in the rest-frame optical and ultraviolet (2600A to 70…
Neutrino Mass and Dark Energy from Weak Lensing
Kevork Abazajian, Scott Dodelson
Weak gravitational lensing of background galaxies by intervening matter directly probes the mass distribution in the universe. This distribution, and its evolution at late times, i…
Environmental Enhancement of Loose Groups around Rich Clusters of Galaxies
M. Einasto, J. Einasto, V. Müller +2
We have studied the properties of Las Campanas Loose Groups in the neighbourhood of rich (Abell, APM and X-ray) clusters of galaxies. These loose groups show strong evidence of seg…
Astrometric Calibration of the Sloan Digital Sky Survey
Jeffrey R. Pier, Jeffrey A. Munn, Robert B. Hindsley +4
The astrometric calibration of the Sloan Digital Sky Survey is described. For point sources brighter than r ~ 20 the astrometric accuracy is 45 milliarcseconds (mas) rms per coordi…
Photometric Redshifts for the SDSS Early Data Release
Istvan Csabai, Tamas Budavari, Andrew J. Connolly +12
The Early Data Release from the Sloan Digital Sky survey provides one of the largest multicolor photometric catalogs currently available to the astronomical community. In this pape…
Everpresent Lambda
Maqbool Ahmed, Scott Dodelson, Patrick B. Greene +1
A variety of observations indicate that the universe is dominated by dark energy with negative pressure, one possibility for which is a cosmological constant. If the dark energy is…
Supernovae and Neutrinos
John F. Beacom
A long-standing problem in supernova physics is how to measure the total energy and temperature of , , , and . While of the highest importance, this is…
Probing Dark Energy with Supernovae: Exploiting Complementarity with the Cosmic Microwave Background
Joshua A. Frieman, Dragan Huterer, Eric V. Linder +1
A primary goal for cosmology and particle physics over the coming decade will be to unravel the nature of the dark energy that drives the accelerated expansion of the Universe. In…
Dark Matter and Dark Energy: The Critical Questions
Michael S. Turner
Stars account for only about 0.5% of the content of the Universe; the bulk of the Universe is optically dark. The dark side of the Universe is comprised of: at least 0.1% light neu…
Halo Models of Large Scale Structure
Asantha Cooray, Ravi Sheth
We review the formalism and applications of the halo-based description of nonlinear gravitational clustering. In this approach, all mass is associated with virialized dark matter h…
Detection of He II reionization in the SDSS quasar sample
T. Theuns, M. Bernardi, J. Frieman +4
The expansion of the Universe leads to a rapid drop in the mean hydrogen Ly-alpha opacity tau of the intergalactic medium (IGM), tau (1+z)^{3.8}, between redshifts 4 and 3. Measure…
Faint High Latitude Carbon Stars Discovered by the Sloan Digital Sky Survey: Methods and Initial Results
Bruce Margon, Scott F. Anderson, Hugh C. Harris +5
We report the discovery of 39 Faint High Latitude Carbon Stars (FHLCs) from Sloan Digital Sky Survey commissioning data. The objects, each selected photometrically and verified spe…
Corrective lenses for high redshift supernovae
Neal Dalal, Daniel E. Holz, Xuelei Chen +1
Weak lensing of high-redshift Type Ia supernovae induces an external dispersion in their observed standard candle brightnesses, comparable in magnitude to the intrinsic dispersion…
Large Scale Structure in the SDSS Galaxy Survey
A. Doroshkevich, D. L. Tucker, S. Allam
The Large Scale Structure (LSS) in the galaxy distribution is investigated using the Sloan Digital Sky Survey Early Data Release (SDSS EDR). Using the Minimal Spanning Tree techniq…
Spectroscopic Target Selection in the Sloan Digital Sky Survey: The Main Galaxy Sample
Michael A. Strauss, David H. Weinberg, Robert H. Lupton +1
We describe the algorithm that selects the main sample of galaxies for spectroscopy in the Sloan Digital Sky Survey from the photometric data obtained by the imaging survey. Galaxy…
A feature at z ~ 3.2 in the evolution of the Ly-alpha forest optical depth
M. Bernardi, R. K. Sheth, M. Subbarao +11
The effective optical depth in the Ly-alpha forest region of 1061 low-resolution QSO spectra drawn from the SDSS database decreases with decreasing redshift over the range 2.5 < z…
Testing the Halo Model Against the SDSS Photometric Survey
Ryan Scranton
We present halo model predictions for the expected angular clustering and associated errors from the completed Sloan Digital Sky Survey (SDSS) photometric galaxy sample. These resu…
Intrinsic/Extrinsic Density-Ellipticity Correlations and Galaxy-Galaxy Lensing
Lam Hui, Jun Zhang
We compute both extrinsic (lensing) and intrinsic contributions to the (galaxy-)density-ellipticity correlation function, the latter done using current analytic theories of tidal a…
Ultrahigh energy cosmic rays from dark matter annihilation
R. Dick, P. Blasi, E. W. Kolb
Annihilation of clumped superheavy dark matter provides an interesting explanation for the origin of ultrahigh energy cosmic rays. The predicted anisotropy signal provides a unique…
Broad Emission Line Shifts in Quasars: An Orientation Measure for Radio-Quiet Quasars?
Gordon T. Richards, Daniel E. Vanden Berk, Timothy A. Reichard +5
Using a sample of 3814 quasars from the Sloan Digital Sky Survey, we confirm that high-ionization, broad, emission lines such as CIV are significantly blueshifted with respect to l…
The Cluster Mass Function from Early SDSS Data: Cosmological Implications
Neta A. Bahcall, Feng Dong, Paul Bode +15
The mass function of clusters of galaxies is determined from 400 deg^2 of early commissioning imaging data of the Sloan Digital Sky Survey; ~300 clusters in the redshift range z =…