Results 31 to 40 of about 120,881 (178)

3D-Matched-Filter Galaxy Cluster Finder I: Selection Functions and CFHTLS Deep Clusters [PDF]

, 2009
We present an optimised galaxy cluster finder, 3D-Matched-Filter (3D-MF), which utilises galaxy cluster radial profiles, luminosity functions and redshift information to detect galaxy clusters in optical surveys.
Adami, Battye, Benoist, Benítez, C. Heymans, Cohn, Davis, De Lucia, Dietrich, Dressler, Erben, Gilbank, Gladders, Grove, Grove, H. Hildebrandt, Hansen, Hilbert, Hildebrandt, Hoekstra, J. P. Dietrich, Kepner, Kitzbichler, Kochanek, Kodama, Koester, L. Van Waerbeke, Le Fèvre, Li, Lilly, Lopes, Lu, M. Milkeraitis, Menanteau, Motl, Olsen, Olsen, Olsen, Olsen, Olsen, Olsen, Popesso, Postman, Ramella, Sealfon, Smith, Soneira, Springel, Stark, T. Erben, Thanjavur, Van Breukelen, Van Waerbeke, White   +53 more
core   +4 more sources

Galaxy Activity in Merging Binary Galaxy Clusters

, 2009
We present the results of a study of galaxy activity in two merging binary clusters (A168 and A1750) using the Sloan Digital Sky Survey (SDSS) data supplemented with the data in the literature.
Adelman-McCarthy, Baldwin, Beers, Beers, Beers, Bekki, Belsole, Blake, Blanton, Blanton, Buote, Burns, Caldwell, Caldwell, Castander, Choi, Cortese, Cortese, De Propris, Donnelly, Dressler, Dressler, Dressler, Dressler, Fadda, Fasano, Ferrari, Forman, Fujita, Fukugita, Girardi, Girardi, Gnedin, Goto, Gunn, Gunn, Hallman, Ho Seong Hwang, Hogg, Hwang, Hwang, Ivezić, Johnston-Hollitt, Jones, Kapferer, Kennicutt, Kewley, Kronberger, Lupton, Markevitch, Martini, Mathis, Mauduit, Miller, Myung Gyoon Lee, Park, Park, Park, Pier, Poggianti, Poggianti, Poole, Quintero, Ramírez, Ricker, Ricker, Schlegel, Smith, Stoughton, Struble, Takizawa, Tegmark, Tomita, Tran, Tran, Tremonti, Tucker, Ulmer, Uomoto, Yan, Yang, Yang, Yang, York, Zabludoff   +84 more
core   +1 more source

Low X-Ray Luminosity Galaxy Clusters: Main goals, sample selection, photometric and spectroscopic observations [PDF]

, 2016
We present the study of nineteen low X-ray luminosity galaxy clusters (L$_X \sim$ 0.5--45 $\times$ $10^{43}$ erg s$^{-1}$), selected from the ROSAT Position Sensitive Proportional Counters (PSPC) Pointed Observations (Vikhlinin et al.
Alonso, M. V., Astudillo, J. M., Carrasco, E. R., Castellón, J. L. Nilo, Cuevas, H., Jaque, M., Lambas, D. García, Mill, A. L. O', Ramos, F., Ramírez, A., Ulloa, N., Valotto, Carlos, Órdenes, Y.   +12 more
core   +3 more sources

Mimicking Symmetry‐Breaking Einstein Ring by Optical Lens

Advanced Photonics Research, EarlyView.
This article uses an optical lens to emulate the gravitational lensing effect and observe the Einstein ring (ER) patterns. The symmetry‐breaking ER, i.e., Einstein cross, is observed utilizing a rotation‐symmetry‐breaking hemi‐ellipsoid lens. Deformed Einstein cross patterns induced by noncollinearly alignment of the light source–lens–observer are ...
Jun‐Liang Duan, Wen Xiao, Minyong Guo, Tong Liu, Huanyang Chen, Jin‐Hui Chen   +5 more
wiley   +1 more source

A GMBCG Galaxy Cluster Catalog of 55,424 Rich Clusters from SDSS DR7

, 2010
We present a large catalog of optically selected galaxy clusters from the application of a new Gaussian Mixture Brightest Cluster Galaxy (GMBCG) algorithm to SDSS Data Release 7 data.
Abazajian, Abell, Adami, Annis, August Evrard, Barger, Barrientos, Bartelmann, Benjamin P. Koester, Berlind, Bernstein, Blakeslee, Blakeslee, Blanton, Bower, Burenin, Böhringer, Couch, David E. Johnston, David Gerdes, Dong, Eduardo Rozo, Efstathiou, Eisenhardt, Eisenstein, Eli S. Rykoff, Erin Sheldon, Gal, Gal, Gal, Gerdes, Gladders, Gladders, Gladders, Gladders, Gladders, Goto, Hansen, Hao, Hao, Hao, Hao, James Annis, Jiangang Hao, Johnston, Kepner, Kim, Koester, Koester, Li, Lopes, López-Cruz, Majumdar, Matthew Becker, Mei, Michael Busha, Miller, Mullis, Navarro, Oukbir, Oyaizu, Papovich, Perlmutter, Postman, Ramella, Riess, Risa H. Wechsler, Rozo, Rozo, Rozo, Rozo, Rykoff, Seth R. Siegel, Sheldon, Silverman, Spergel, Spergel, The Dark Energy Survey Collaboration., Timothy A. McKay, Wen, Yang, York   +81 more
core   +2 more sources

The Clustering of Galaxies

Publications of the Astronomical Society of the Pacific, 1961
Inspecti of photographs obtained with wide-angle telescopes sho' that the distribution of galaxies over the sky is distinctly nt miform. The observed dumpiness of the distribution of ga ies is believed to be due to a tendency for galaxies to occur in sters. A cluster of galaxies is usually regarded as a distinct >e of aggregate of matter.
openaire   +4 more sources

Galaxy harassment and the evolution of clusters of galaxies [PDF]

Nature, 1996
Disturbed spiral galaxies with high rates of star formation pervaded clusters of galaxies just a few billion years ago, but nearby clusters exclude spirals in favor of ellipticals. ``Galaxy harassment" (frequent high speed galaxy encounters) drives the morphological transformation of galaxies in clusters, provides fuel for quasars in subluminous hosts ...
Alan Dressler, Neal Katz, Ben Moore, Augustus Oemler, George Lake   +4 more
openaire   +2 more sources

Exercise without Weight Loss Prevents Seasonal Decline in Vitamin D Metabolites: The VitaDEx Randomized Controlled Trial

Advanced Science, EarlyView.
In people with overweight or obesity, regular exercise even without weight loss or vitamin D supplementation completely prevents the usual winter decline in the vitamin D metabolite that maintains health at a cellular level, 1,25(OH)2D3, and ameliorates the decline in the vitamin D status marker 25(OH)D.
Oliver J. Perkin, Sophie E. Davies, Martin Hewison, Kerry S. Jones, Javier T. Gonzalez, James A. Betts, Carl Jenkinson, Mark A. Lindsay, Sarah R. Meadows, Damon A. Parkington, Albert Koulman, Dylan Thompson   +11 more
wiley   +1 more source

Near-IR search for lensed supernovae behind galaxy clusters: III. Implications for cluster modeling and cosmology

, 2011
Massive galaxy clusters at intermediate redshifts act as gravitational lenses that can magnify supernovae (SNe) occurring in background galaxies. We assess the possibility to use lensed SNe to put constraints on the mass models of galaxy clusters and the
A. Goobar, Amanullah, Bell, Bolton, Bradač, Bradley, Broadhurst, Casali, Coe, Conley, Dahlén, Dawson, E. Mörtsell, Fohlmeister, Goobar, Goobar, Goobar, Inada, J. Jönsson, J. Richard, Jullo, K. Paech, Kissler-Patig, Kneib, Kochanek, Kolatt, Lampeitl, Limousin, M. Limousin, Moorwood, Mörtsell, Oguri, Oguri, Pirard, R. Amanullah, Refsdal, Richard, Riess, Scannapieco, Stanishev, Suyu, T. Dahlén, T. Riehm, Wambsganss, Witt, Zhao, Zheng   +46 more
core   +3 more sources

Expectations For an Interferometric Sunyaev-Zel'dovich Effect Survey for Galaxy Clusters [PDF]

, 2000
Non-targeted surveys for galaxy clusters using the Sunyaev-Zel'dovich effect (SZE) will yield valuable information on both cosmology and evolution of the intra-cluster medium (ICM). The redshift distribution of detected clusters will constrain cosmology,
Barbosa D., Cavaliere A., De Luca A., Evrard A. E., Oukbir J., Peacock J., Sunyaev R., White D. A.   +7 more
core   +2 more sources