Results 41 to 50 of about 12,901,041 (346)
Mind the Gap: Tightening the Mass-Richness Relation with Magnitude Gaps [PDF]
, 2013 We investigate the potential to improve optical tracers of cluster mass by exploiting measurements of the magnitude gap, m12, defined as the difference between the r-band absolute magnitude of the two brightest cluster members.
Abazajian +33 more
core +1 more source
Constraints on the Optical Depth of Galaxy Groups and Clusters [PDF]
, 2016 Future data from galaxy redshift surveys, combined with high-resolutions maps of the cosmic microwave background, will enable measurements of the pairwise kinematic Sunyaev–Zel’dovich (kSZ) signal with unprecedented statistical significance.
S. Flender, D. Nagai, M. McDonald
semanticscholar +1 more source
On the common nature of dark matter and dark energy: Galaxy groups [PDF]
The European Physical Journal Plus, 2017 .It is shown that the cosmological constant links the roots both of General Relativity and Newtonian gravity via the general function satisfying Newton’s theorem according to which the gravitating sphere acts as a point mass situated in its center.
V. Gurzadyan
semanticscholar +1 more source
Filaments of galaxies and Voronoi diagrams
Open Astronomy, 2018 The intersections between a spherical shell and the faces of Voronoi polyhedrons are numerically evaluated. The nodes of these intersections are the points that share the same distances from three nuclei.
Zaninetti Lorenzo
doaj +1 more source
Halo ellipticity of GAMA galaxy groups from KiDS weak lensing [PDF]
, 2016 We constrain the average halo ellipticity of ~2 600 galaxy groups from the Galaxy And Mass Assembly (GAMA) survey, using the weak gravitational lensing signal measured from the overlapping Kilo Degree Survey (KiDS).
E. V. Uitert +16 more
semanticscholar +1 more source
Iron in galaxy groups and clusters: confronting galaxy evolution models with a newly homogenized data set [PDF]
, 2016 We present an analysis of the iron abundance in the hot gas surrounding galaxy groups and clusters. To do this, we first compile and homogenize a large data set of 79 low-redshift (z = 0.03) systems (159 individual measurements) from the literature.
R. Yates, P. Thomas, B. Henriques
semanticscholar +1 more source
Abundance profiles and cool cores in galaxy groups [PDF]
, 2011 Using data from the Two Dimensional XMM-Newton Group Survey (2dXGS), we have examined the abundance profile properties of both cool core (CC) and non cool core (NCC) galaxy groups.
Alastair J. R. Sanderson +62 more
core +1 more source
A statistical study of the luminosity gap in galaxy groups
, 2010 The luminosity gap between the two brightest members of galaxy groups and clusters is thought to offer a strong test for the models of galaxy formation and evolution.
Ghanbari, Jamshid +4 more
core +1 more source
First results of the XI Groups Project: Studying an unbiased sample of galaxy groups [PDF]
, 2006 X-ray observations of hot, intergalactic gas in galaxy groups provide a useful means of characterizing the global properties of groups. However, X-ray studies of large group samples have typically involved very shallow X-ray exposures or have been based ...
Miles, Trevor A. +4 more
core +3 more sources
Galaxy And Mass Assembly: search for a population of high-entropy galaxy groups [PDF]
, 2017 Observations with the ChandraX-ray Observatory are used to examine the hot gas properties within a sample of 10 galaxy groups selected from the Galaxy And Mass Assembly survey's optical Friends-of-Friends group catalogue. Our groups have been screened to
Richard J. Pearson +9 more
semanticscholar +1 more source