Results 71 to 80 of about 49,160 (208)

ARCRAIDER II: Arc search in a sample of non-Abell clusters [PDF]

, 2010
We present a search for gravitational arcs in a sample of X-ray luminous, medium redshift clusters of galaxies. The sample of clusters is called ARCRAIDER, is based on the ROSAT Bright Survey (RBS) and fulfills the following criteria: (a) X-ray ...
A. Schwope, Bartelmann, Bolton, Bradac, Broadhurst, Dalal, Erben, Estrada, Flores, Gioia, Halkola, Hanany, Hennawi, Horesh, J. Wambsganss, Kausch, Keeton, Le Fevre, Lenzen, Li, Luppino, Lynds, Meneghetti, Oguri, Oguri, Perlmutter, Pryke, Puchwein, Reiprich, Riess, S. Schindler, Sand, Schindler, Schlegel, Schwope, Smail, Smith, Spergel, Stetson, Stocke, T. Erben, Torri, Voges, W. Kausch, Wambsganss   +44 more
core   +1 more source

Redshift‐Agnostic Machine Learning Classification: Unveiling Peak Performance in Galaxy, Star, and Quasar Classification (Using SDSS DR17)

Astronomische Nachrichten, Volume 346, Issue 5, June 2025.
ABSTRACT Classification of galaxies, stars, and quasars using spectral data is fundamental to astronomy, but often relies heavily on redshift. This study evaluates the performance of 10 machine learning algorithms on SDSS data to classify these objects, with a particular focus on scenarios where redshift information is unavailable.
Debashis Chatterjee, Prithwish Ghosh
wiley   +1 more source

Environmental Effects on the Stellar Mass Function in a z ∼ 3.3 Overdensity of Galaxies in the COSMOS Field

The Astrophysical Journal
We present an analysis of the number density of galaxies as a function of stellar mass (i.e., the stellar mass function (SMF)) in the COSMOS field at z ∼ 3.3, making a comparison between the SMF in overdense environments and the SMF in the coeval field ...
Ben Forrest, Brian C. Lemaux, Ekta A. Shah, Priti Staab, Roy R. Gal, Lori M. Lubin, M. C. Cooper, Olga Cucciati, Denise Hung, Ian McConachie, Adam Muzzin, Gillian Wilson, Sandro Bardelli, Letizia P. Cassarà, Wenjun Chang, Finn Giddings, Emmet Golden-Marx, Nimish Hathi, Stephanie M. Urbano Stawinski, Elena Zucca   +19 more
doaj   +1 more source

The Radio Luminosity Function of Cluster Radio Halos [PDF]

, 2002
A significant fraction of galaxy clusters exhibits cluster wide radio halos. We give a simple prediction of the local and higher redshift radio halo luminosity function (RHLF) on the basis of (i) an observed and a theoretical X-ray cluster luminosity ...
Ensslin, Torsten A., Roettgering, Huub
core   +3 more sources

Herschel-ATLAS : the spatial clustering of low- and high-redshift submillimetre galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2018
17 pages, 11 figures, 3 tables.
A Amvrosiadis, E Valiante, J Gonzalez-Nuevo, S J Maddox, M Negrello, S A Eales, L Dunne, L Wang, E van Kampen, G De Zotti, M W L Smith, P Andreani, J Greenslade, C Tai-An, M J Michałowski   +14 more
openaire   +4 more sources

Lactea: Web‐Based Spectrum‐Preserving Multi‐Resolution Visualization of the GAIA Star Catalog

Computer Graphics Forum, Volume 44, Issue 3, June 2025.
Abstract The explosion of data in astronomy has resulted in an era of unprecedented opportunities for discovery. The GAIA mission's catalog, containing a large number of light sources (mostly stars) with several parameters such as sky position and proper motion, is playing a significant role in advancing astronomy research and has been crucial in ...
Reem Alghamdi, Markus Hadwiger, Guido Reina, Alberto Jaspe‐Villanueva   +3 more
wiley   +1 more source

Modeling and Subtracting Diffuse Cluster Light in JWST Images: A Relation between the Spatial Distribution of Globular Clusters, Dwarf Galaxies, and Intracluster Light in the Lensing Cluster SMACS 0723

The Astrophysical Journal
We present a methodology for modeling and removing light from cluster galaxies and intracluster light (ICL) from James Webb Space Telescope images of gravitational lensing clusters.
Nicholas S. Martis, Ghassan T. E. Sarrouh, Chris J. Willott, Roberto Abraham, Yoshihisa Asada, Maruša Bradač, Gabriel B. Brammer, Guillaume Desprez, Anishya Harshan, Adam Muzzin, Gaël Noirot, Gregor Rihtaršič, Marcin Sawicki, Victoria Strait   +13 more
doaj   +1 more source

Redshift Evolution of the Feedback–Cooling Equilibrium in the Core of 48 SPT Galaxy Clusters: A Joint Chandra–SPT–ATCA Analysis

The Astrophysical Journal, 2023
We analyze the cooling and feedback properties of 48 galaxy clusters at redshifts 0.4 < z < 1.3 selected from the South Pole Telescope (SPT) catalogs to evolve like the progenitors of massive and well-studied systems at z ∼ 0. We estimate the radio power
F. Ruppin, M. McDonald, J. Hlavacek-Larrondo, M. Bayliss, L. E. Bleem, M. Calzadilla, A. C. Edge, M. D. Filipović, B. Floyd, G. Garmire, G. Khullar, K. J. Kim, R. Kraft, G. Mahler, R. P. Norris, A. O’Brien, C. L. Reichardt, T. Somboonpanyakul, A. A. Stark, N. Tothill   +19 more
doaj   +1 more source

A critical analysis of high-redshift, massive, galaxy clusters. Part I [PDF]

Journal of Cosmology and Astroparticle Physics, 2012
20 pages, 6 figures, 2 tables, modified to match accepted version (JCAP); title changed, main analysis unchanged, additional ...
Ben Hoyle, Raul Jimenez, Licia Verde, Shaun Hotchkiss   +3 more
openaire   +3 more sources

swPHoToNs: Toward trillion‐body‐scale cosmological N‐body simulations on Sunway TaihuLight supercomputer

Engineering Reports, Volume 7, Issue 3, March 2025.
We present the details of implementing a highly efficient and scalable Cosmological N‐body simulation framework on the heterogeneous many‐core supercomputer Sunway TaihuLight. We manage to conduct cosmological simulations which contain up to 1.6 trillion particles, obtaining a sustained performance of 56.3 PFlops with a weak‐scaling parallel efficiency
Zhao Liu, Qiao Wang, Xiaojing Lv, Xu Liu, Hongsong Meng, Guanghui Zhu, Liang Gao, Haohuan Fu, Guangwen Yang   +8 more
wiley   +1 more source