Results 41 to 50 of about 12,793,373 (294)
Radio galaxy feedback in X-ray selected groups from COSMOS: the effect on the ICM [PDF]
, 2010 We quantify the importance of the mechanical energy released by radio-galaxies inside galaxy groups. We use scaling relations to estimate the mechanical energy released by 16 radio-AGN located inside X-ray detected galaxy groups in the COSMOS field.
A. Finoguenov +44 more
core +4 more sources
Age Estimates for Galaxies in Groups [PDF]
International Astronomical Union Colloquium, 2000 AbstractWe discuss recent developments on the age and metallicity distribution for early type galaxies in different environments.
A. I. Terlevich, Duncan A. Forbes
openaire +3 more sources
Gas Contents of Galaxy Groups from Thermal Sunyaev–Zel’dovich Effects [PDF]
, 2017 A matched filter technique is applied to the Planck all-sky Compton y-parameter map to measure the thermal Sunyaev–Zel’dovich (tSZ) effect produced by galaxy groups of different halo masses selected from large redshift surveys in the low-z universe ...
Seunghwan Lim +6 more
semanticscholar +1 more source
Understanding `galaxy groups' as a unique structure in the universe [PDF]
, 2017 `Galaxy groups' have hardly been realised as a separate class of objects with specific characteristics in the structural hierarchy. The presumption that the self-similarity of dark matter structures is a valid prescription for the baryonic universe at ...
S. Paul +9 more
semanticscholar +1 more source
ALIGNMENTS OF GROUP GALAXIES WITH NEIGHBORING GROUPS [PDF]
The Astrophysical Journal, 2009 13 pages, 16 figures, accepted by ...
Xiaohu Yang +4 more
openaire +3 more sources
Hierarchical inference of the relationship between Concentration and Mass in Galaxy Groups and Clusters [PDF]
, 2017 Mass is a fundamental property of galaxy groups and clusters. In theory weak gravitational lensing will enable an approximately unbiased measurement of mass, but parametric methods for extracting cluster masses from data require the additional knowledge ...
M. Lieu +5 more
semanticscholar +1 more source
The influence of halo assembly on galaxies and galaxy groups [PDF]
Monthly Notices of the Royal Astronomical Society, 2009 In this paper, we study the variations of group galaxy properties according to the assembly history in SDSS-DR6 selected groups. Using mock SDSS group catalogues, we find two suitable indicators of group formation time: i) the isolation of the group, defined as the distance to the nearest neighbor in terms of its virial radius, and ii) the ...
Tatiana Zapata +4 more
openaire +5 more sources
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
Galaxy Groups at Intermediate Redshift [PDF]
The Astrophysical Journal, 2001 Galaxy groups likely to be virialized are identified within the CNOC2 intermediate redshift galaxy survey using an iterative method. The number-velocity dispersion relation is in agreement with the low-mass extrapolation of the cluster normalized Press-Schechter function.
Simon L. Morris +17 more
openaire +4 more sources
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