Results 61 to 70 of about 12,959,376 (400)
The Evolution of Galaxy Groups and of Galaxies Therein [PDF]
, 2007 Properties of groups of galaxies depend sensitively on the algorithm for group selection, and even the most recent catalogs of groups built from redshift-space selection should suffer from projections and infalling galaxies. The cosmo-dynamical evolution of groups from initial Hubble expansion to collapse and virialization leads to a fundamental track (
openaire +3 more sources
Isolated Galaxies, Pairs and Groups of Galaxies [PDF]
International Astronomical Union Colloquium, 1990 We searched for isolated galaxies, pairs and groups of galaxies in the CfA survey (Huchra et al. 1983). It was assumed that the distances to galaxies are given by R = V/H0, where H0 = 100 km s−1 Mpc−1 and R> 6 Mpc.
I. Kuneva, M. Kalinkov
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Disturbed Fossil Group Galaxy NGC 1132
, 2018 We have analyzed the Chandra archival data of NGC 1132, a well-known fossil group, i.e. a system expected to be old and relaxed long after the giant elliptical galaxy assembly. Instead, the Chandra data reveal that the hot gas morphology is disturbed and
Anderson, Craig +12 more
core +1 more source
A BOUND VIOLATION ON THE GALAXY GROUP SCALE: THE TURN-AROUND RADIUS OF NGC 5353/4 [PDF]
, 2015 The first observational evidence for the violation of the maximum turn-around radius on the galaxy group scale is presented. The NGC 5353/4 group is chosen as an ideal target for our investigation of the bound-violation because of its proximity, low ...
Jounghun Lee, Suk Kim, S. Rey
semanticscholar +1 more source
The Orientation of Galaxies in Nearby Galaxy Groups [PDF]
Symposium - International Astronomical Union, 2004 The statistical analysis of six nearby groups of galaxies, connected with the Milky Way, M31, M81, M101, NGC5128 and NGC5236 shows an isotropic distribution of galaxy planes, similarly to galaxies within the Local Group. Also planes of galaxies in the nearby (Vr < 500 km s−1) region of the Local Supercluster exhibit random distribution, disregarding
P. Flin, M. Biernacka, J. Krywult
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Evolution of galaxy groups in the Illustris simulation
, 2016 We present the first study of evolution of galaxy groups in the Illustris simulation. We focus on dynamically relaxed and unrelaxed galaxy groups representing dynamically evolved and evolving galaxy systems, respectively.
Dariush, Ali A. +2 more
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Properties of Galaxy Groups in the SDSS: I.-- The Dependence of Colour, Star Formation, and Morphology on Halo Mass [PDF]
, 2005 Using a large galaxy group catalogue constructed from the SDSS, we investigate the correlation between various galaxy properties and halo mass. We split the population of galaxies in early types, late types, and intermediate types, based on their colour ...
Bosch, Frank C. van den +3 more
core +2 more sources
Scaling Properties of a Complete X-ray Selected Galaxy Group Sample [PDF]
, 2014 Upcoming X-ray surveys like eROSITA require precise calibration between X-ray observables and mass down to the low mass regime to set tight constraints on the fundamental cosmological parameters.
L. Lovisari +2 more
semanticscholar +1 more source
STUDYING GALAXY FORMATION IN LOOSE GALAXY GROUPS [PDF]
, 2007 4 pages, To appear in the proceedings of the "Island Universes: Structure and Evolution of Disk Galaxies" conference held in Terschelling, Netherlands, July 2005, ed. R. de Jong (Springer: Dordrecht)
Pisano, D. J. +5 more
openaire +2 more sources
Galaxy Group Ellipticity Confirms a Younger Cosmos
UniverseWe present an analysis of the ellipticities of galaxy groups, derived from the spatial distribution of member galaxies, revealing a notable incongruity between the observed local galaxy groups and their counterparts in the Lambda cold dark matter ...
Yu Rong
doaj +1 more source