Results 121 to 130 of about 12,793,373 (294)

The origin of redshift asymmetries: How LambdaCDM explains anomalous redshift

, 2008
Several authors have found a statistically significant excess of galaxies with higher redshifts relative to the group centre, so-called discordant redshifts, in particular in groups where the brightest galaxy, identified in apparent magnitudes, is a ...
Arp, Arp, Bahcall, Berlind, Bottinelli, Botzler, Byrd, Croton, D'Onghia, Diaferio, Driver, Einasto, Eke, Eke, Focardi, Geller, Girardi, Goto, Goto, Hickson, Hickson, Hickson, Holmberg, Huchra, Humason, Iovino, Jaakkola, Jerjen, Jones, Karachentsev, Kim, Koester, Lucia, M. Valtonen, Mahdavi, Materne, Merchán, Moore, Niemi, Nolthenius, Ostriker, Ponman, Ramella, Ramella, Rekola, Rekola, S.-M. Niemi, Santos, Schechter, Shakhbazyan, Simien, Springel, Springel, Springel, Sulentic, Tago, Tago, Teerikorpi, Tucker, Tully, Turner, Valtonen, Yang, Zabludoff, Zaritsky   +64 more
core   +1 more source

The shape of poor groups of galaxies [PDF]

Monthly Notices of the Royal Astronomical Society, 2004
7 pages, MNRAS accepted ...
Spyros Basilakos, Hrant M. Tovmassian, Manolis Plionis   +2 more
openaire   +3 more sources

SARCS strong-lensing galaxy groups - II. Mass-concentration relation and strong-lensing bias [PDF]

, 2014
Our work is based on the stacked weak-lensing analysis of a sample of 80 strong-lensing galaxy groups. Our main results are the following: (i) the lensing signal does not allow us to firmly reject a simple singular isothermal sphere mass distribution ...
G. Foex, V. Motta, E. Jullo, M. Limousin, T. Verdugo   +4 more
semanticscholar   +1 more source

The galaxy of Coxeter groups

Journal of Algebra
In this paper we introduce the galaxy of Coxeter groups -- an infinite dimensional, locally finite, ranked simplicial complex which captures isomorphisms between Coxeter systems. In doing so, we would like to suggest a new framework to study the isomorphism problem for Coxeter groups.
Yuri Santos Rego, Petra Schwer
openaire   +2 more sources

Galaxy Superclusters and Their Complexes in the Cosmic Web

Universe
The richest and largest structures in the cosmic web are galaxy superclusters, their complexes (associations of several almost connected very rich superclusters), and planes.
Maret Einasto
doaj   +1 more source

Galaxy Groups and Modified Dynamics [PDF]

The Astrophysical Journal, 1998
5 pages, Latex, to appear in Astrophys.
openaire   +4 more sources

The evolution of star formation activity in galaxy groups [PDF]

, 2014
We study the evolution of the total star formation (SF) activity, total stellar mass (ΣM*) and halo occupation distribution (HOD) in massive haloes by using one of the largest X-ray selected sample of galaxy groups with secure spectroscopic ...
G.Erfanianfar, P. Popesso, A. Finoguenov, S. Wuyts, D. Wilman, A. Biviano, F. Ziparo, M. Salvato, K. Nandra, D. Lutz, D. Elbaz, M. Dickinson, M. Tanaka, M. Mirkazemi, M. Balogh, M. Altieri, H. Aussel, F. Bauer, S. Berta, R. Bielby, N. Brandt, N. Cappelluti, A. Cimatti, M. Cooper, D. Fadda, O. Ilbert, E. L. Floch, B. Magnelli, J. Mulchaey, R. Nordon, J. Newman, A. Poglitsch, F. Pozzi   +32 more
semanticscholar   +1 more source

Introducing the Condor Array Telescope. VI. Discovery of Extensive Ionized Gaseous Filaments of the Cosmic Web in the Direction of the M81 Group

The Astrophysical Journal
We used the Condor Array Telescope to obtain deep imaging observations through luminance broadband and He ii , [O iii ], He i , H α , [N ii ], and [S ii ] narrowband filters of an extended region of the M81 Group spanning ≈8 × 8 deg ^2 on the sky ...
Kenneth M. Lanzetta, Stefan Gromoll, Michael M. Shara, David Valls-Gabaud, Frederick M. Walter, John K. Webb   +5 more
doaj   +1 more source

Fresh Activity in Old Systems: Radio AGN in Fossil Groups of Galaxies

, 2012
We present the first systematic 1.4 GHz Very Large Array radio continuum survey of fossil galaxy group candidates. These are virialized systems believed to have assembled over a gigayear in the past through the merging of galaxy group members into a ...
Bîrzan, Cisternas, Condon, Corbin, D'Onghia, David, De Robertis, Eric M. Wilcots, Jones, Kelley M. Hess, La Barbera, Mendes de Oliveira, Mendes de Oliveira, Mulchaey, Santos, Schawinski, Sun, Thomson, Tozzi, Ulmer, van Gorkom, Victoria L. Hartwick, Vikhlinin, White, Wise, Yamagata   +25 more
core   +1 more source

Towards a realistic population of simulated galaxy groups and clusters [PDF]

, 2013
We present a new suite of large-volume cosmological hydrodynamical simulations called cosmo-OWLS. They form an extension to the OverWhelmingly Large Simulations (OWLS) project, and have been designed to help improve our understanding of cluster ...
A. Brun, I. McCarthy, J. Schaye, T. Ponman   +3 more
semanticscholar   +1 more source