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We present a modified adaptive matched filter algorithm designed to identify clusters of galaxies in wide-field imaging surveys such as the Sloan Digital Sky Survey. The cluster-finding technique is fully adaptive to imaging surveys with…

Astrophysics · Physics 2009-11-13 Feng Dong , Elena Pierpaoli , James E. Gunn , Risa H. Wechsler

We present the "C4 Cluster Catalog", a new sample of 748 clusters of galaxies identified in the spectroscopic sample of the Second Data Release (DR2) of the Sloan Digital Sky Survey (SDSS). The C4 cluster--finding algorithm identifies…

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 clusters of galaxies, and a low-resolution field with…

Astrophysics · Physics 2011-03-03 J. Einasto , G. H"utsi , M. Einasto , E. Saar , D. L. Tucker , V. M"uller , P. Hein"am"aki , S. S. Allam

Galaxy clusters can be detected as surface brightness enhancements in smoothed optical surveys. This method does not require individual galaxies to be identifiable, and enables clusters to be detected out to surprisingly high redshifts, as…

Astrophysics · Physics 2009-11-07 Matthias Bartelmann , Simon D. M. White

We apply clustering-based redshift inference to all extended sources from the Sloan Digital Sky Survey photometric catalogue, down to magnitude r = 22. We map the relationships between colours and redshift, without assumption of the…

The 2dF Galaxy Redshift Survey has now been completed and has mapped the three-dimensional distribution, and hence clustering, of galaxies in exquisite detail over an unprecedentedly large ($\sim 10^{8} h^{-3}$ Mpc$^{3}$) volume of the…

Astrophysics · Physics 2007-05-23 Warrick Couch , Matthew Colless , Roberto De Propris

Using the photometric redshifts of galaxies from the Sloan Digital Sky Survey III (SDSS-III), we identify 132,684 clusters in the redshift range of 0.05<z<0.8. Monte Carlo simulations show that the false detection rate is less than 6% for…

Cosmology and Nongalactic Astrophysics · Physics 2012-05-01 Z. L. Wen , J. L. Han , F. S. Liu

We report on the first results of an imaging survey to detect strong gravitational lensing targeting the richest clusters selected from the photometric data of the Sloan Digital Sky Survey (SDSS) with follow-up deep imaging observations…

We interpret and model the statistical weak lensing measurements around 130,000 groups and clusters of galaxies in the Sloan Digital Sky Survey presented by Sheldon et al. 2007 (Paper I). We present non-parametric inversions of the 2D shear…

Imaging data from the Sloan Digital Sky Survey is used to measure the empirical size-richness relation for a large sample of galaxy clusters. Using population subtraction methods, we determine the radius at which the cluster galaxy number…

We present the 3D real space clustering power spectrum of a sample of \~600,000 luminous red galaxies (LRGs) measured by the Sloan Digital Sky Survey (SDSS), using photometric redshifts. This sample of galaxies ranges from redshift z=0.2 to…

Differences in clustering properties between galaxy subpopulations complicate the cosmological interpretation of the galaxy power spectrum, but can also provide insights about the physics underlying galaxy formation. To study the nature of…

Astrophysics · Physics 2008-11-26 Molly E. C. Swanson , Max Tegmark , Michael Blanton , Idit Zehavi

The cluster correlation function and its richness dependence are determined from 1108 clusters of galaxies -- the largest sample of clusters studied so far -- found in 379 deg^2 of Sloan Digital Sky Survey early data. The results are…

Astrophysics · Physics 2009-11-10 Neta A. Bahcall , Feng Dong , Lei Hao , Paul Bode , Jim Annis , James E. Gunn , Donald P. Schneider

We present a lensing study of 42 galaxy clusters imaged in Sloan Digital Sky Survey (SDSS) commissioning data. Cluster candidates are selected optically from SDSS imaging data and confirmed for this study by matching to X-ray sources found…

We compare the large scale galaxy clustering in the new SDSS early data release (EDR) with the clustering in the APM Galaxy Survey. We cut out pixel maps (identical in size and shape) from the SDSS and APM data to allow a direct comparison…

Astrophysics · Physics 2009-11-06 E. Gaztanaga

We present the first measurements of clustering in the Sloan Digital Sky Survey (SDSS) galaxy redshift survey. Our sample consists of 29,300 galaxies with redshifts 5,700 km/s < cz < 39,000 km/s, distributed in several long but narrow…

We describe the scientific motivation behind, and the methodology of, the Stanford Cluster Search (StaCS), a program to compile a catalog of optically selected clusters of galaxies at intermediate and high (0.3 < z < 1) redshifts. The…

The next-generation astronomy digital archives will cover most of the universe at fine resolution in many wave-lengths, from X-rays to ultraviolet, optical, and infrared. The archives will be stored at diverse geographical locations. One of…

Databases · Computer Science 2016-08-31 Alexander S. Szalay , Peter Kunszt , Ani Thakar , Jim Gray

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 3800 square degrees of photometric…

The Sloan Digital Sky Survey (SDSS) started a new phase in August 2008, with new instrumentation and new surveys focused on Galactic structure and chemical evolution, measurements of the baryon oscillation feature in the clustering of…

Instrumentation and Methods for Astrophysics · Physics 2015-05-27 III collaboration , Hiroaki Aihara , Carlos Allende Prieto , Deokkeun An , Scott F. Anderson , Éric Aubourg , Eduardo Balbinot , Timothy C. Beers , Andreas A. Berlind , Steven J. Bickerton , Dmitry Bizyaev , Michael R. Blanton , John J. Bochanski , Adam S. Bolton , Jo Bovy , W. N. Brandt , J. Brinkmann , Peter J. Brown , Joel R. Brownstein , Nicolas G. Busca , Heather Campbell , Michael A. Carr , Yanmei Chen , Cristina Chiappini , Johan Comparat , Natalia Connolly , Marina Cortes , Rupert A. C. Croft , Antonio J. Cuesta , Luiz N. da Costa , James R. A. Davenport , Kyle Dawson , Saurav Dhital , Anne Ealet , Garrett L. Ebelke , Edward M. Edmondson , Daniel J. Eisenstein , Stephanie Escoffier , Massimiliano Esposito , Michael L. Evans , Xiaohui Fan , Bruno Femení a Castellá , Andreu Font-Ribera , Peter M. Frinchaboy , Jian Ge , Bruce A. Gillespie , G. Gilmore , Jonay I. González Hernández , J. Richard Gott , Andrew Gould , Eva K. Grebel , James E. Gunn , Jean-Christophe Hamilton , Paul Harding , David W. Harris , Suzanne L. Hawley , Frederick R. Hearty , Shirley Ho , David W. Hogg , Jon A. Holtzman , Klaus Honscheid , Naohisa Inada , Inese I. Ivans , Linhua Jiang , Jennifer A. Johnson , Cathy Jordan , Wendell P. Jordan , Eyal A. Kazin , David Kirkby , Mark A. Klaene , G. R. Knapp , Jean-Paul Kneib , C. S. Kochanek , Lars Koesterke , Juna A. Kollmeier , Richard G. Kron , Hubert Lampeitl , Dustin Lang , Jean-Marc Le Goff , Young Sun Lee , Yen-Ting Lin , Daniel C. Long , Craig P. Loomis , Sara Lucatello , Britt Lundgren , Robert H. Lupton , Zhibo Ma , Nicholas MacDonald , Suvrath Mahadevan , Marcio A. G. Maia , Martin Makler , Elena Malanushenko , Viktor Malanushenko , Rachel Mandelbaum , Claudia Maraston , Daniel Margala , Karen L. Masters , Cameron K. McBride , Peregrine M. McGehee , Ian D. McGreer , Brice Ménard , Jordi Miralda-Escudé , Heather L. Morrison , F. Mullally , Demitri Muna , Jeffrey A. Munn , Hitoshi Murayama , Adam D. Myers , Tracy Naugle , Angelo Fausti Neto , Duy Cuong Nguyen , Robert C. Nichol , Robert W. O'Connell , Ricardo L. C. Ogando , Matthew D. Olmstead , Daniel J. Oravetz , Nikhil Padmanabhan , Nathalie Palanque-Delabrouille , Kaike Pan , Parul Pandey , Isabelle Pâris , Will J. Percival , Patrick Petitjean , Robert Pfaffenberger , Janine Pforr , Stefanie Phleps , Christophe Pichon , Matthew M. Pieri , Francisco Prada , Adrian M. Price-Whelan , M. Jordan Raddick , Beatriz H. F. Ramos , Céline Reylé , James Rich , Gordon T. Richards , Hans-Walter Rix , Annie C. Robin , Helio J. Rocha-Pinto , Constance M. Rockosi , Natalie A. Roe , Emmanuel Rollinde , Ashley J. Ross , Nicholas P. Ross , Bruno M. Rossetto , Ariel G. Sánchez , Conor Sayres , David J. Schlegel , Katharine J. Schlesinger , Sarah J. Schmidt , Donald P. Schneider , Erin Sheldon , Yiping Shu , Jennifer Simmerer , Audrey E. Simmons , Thirupathi Sivarani , Stephanie A. Snedden , Jennifer S. Sobeck , Matthias Steinmetz , Michael A. Strauss , Alexander S. Szalay , Masayuki Tanaka , Aniruddha R. Thakar , Daniel Thomas , Jeremy L. Tinker , Benjamin M. Tofflemire , Rita Tojeiro , Christy A. Tremonti , Jan Vandenberg , M. Vargas Magaña , Licia Verde , Nicole P. Vogt , David A. Wake , Ji Wang , Benjamin A. Weaver , David H. Weinberg , Martin White , Simon D. M. White , Brian Yanny , Naoki Yasuda , Christophe Yeche , Idit Zehavi