Results 91 to 100 of about 60,718 (195)
GROUPINGS OF POPULATION I OBJECTS IN THE GALAXY
Odessa Astronomical Publications, 2017 The distribution of Cepheids in the Galaxy is studied using a new catalogue of Cepheid distances in conjunction with the method of hierarchical clustering.
L. N. Berdnikov +3 more
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X-ray emission from clusters and groups of galaxies [PDF]
Proceedings of the National Academy of Sciences, 1998 Recent major advances in x-ray imaging and spectroscopy of clusters have allowed the determination of their mass and mass profile out to ≈1/2 the virial radius. In rich clusters, most of the baryonic mass is in the gas phase, and the ratio of mass in gas/stars varies by a factor of 2–4.
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The Astrophysical JournalWe present initial results from extremely well-resolved 3D magnetohydrodynamical simulations of idealized galaxy clusters, conducted using the AthenaPK code on the Frontier exascale supercomputer.
Philipp Grete +7 more
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Suzaku Observations of the X-ray Brightest Fossil Group ESO 3060170
, 2013 "Fossil" galaxy groups, each dominated by a relatively isolated giant elliptical galaxy, have many properties intermediate between groups and clusters of galaxies.
Miller, Eric D. +2 more
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The DEEP2 Galaxy Redshift Survey: Clustering of Groups and Group Galaxies atz ∼ 1
The Astrophysical Journal, 2006 We study the clustering properties of groups and of galaxies in groups in the DEEP2 Galaxy Redshift Survey dataset at z~1. Four clustering measures are presented: 1) the group correlation function for 460 groups with estimated velocity dispersions of sigma>200 km/s, 2) the galaxy correlation for the full galaxy sample, using a flux-limited sample of
Coil, Alison L. +9 more
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An environmental Butcher-Oemler effect in intermediate redshift X-ray clusters
, 2010 We present uniform CFHT Megacam g and r photometry for 34 X-ray selected galaxy clusters drawn from the X-ray Multi-Mirror (XMM) Large Scale Structure (LSS) survey and the Canadian Cluster Comparison Project (CCCP). The clusters possess well determined X-
Abadi +49 more
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Formation of Groups and Clusters of Galaxies
, 1998 The formation, inner properties, and spatial distribution of galaxy groups and clusters are closely related to the background cosmological model. We use numerical simulations of variants of the CDM model with different cosmological parameters and distinguish relaxed objects from recent mergers using the degree of virialisation.
Knebe, Alexander, Mueller, Volker
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GalaxiesThis study presents a novel method for characterizing galaxy clusters by integrating statistical classification techniques with an optimized adaptation of the red sequence approach.
Dagoberto R. Mares-Rincón +3 more
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Distribution of Merging and Post-merger Galaxies in Nearby Galaxy Clusters
The Astrophysical JournalWe study the incidence and spatial distribution of galaxies that are currently undergoing gravitational merging (M) or that have signs of being post-merger (PM) in six galaxy clusters (A754, A2399, A2670, A3558, A3562, and A3716) within the redshift ...
Duho Kim +12 more
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Robust Detection of Hot Intragroup Medium in Optically Selected, Poor Galaxy Groups by eROSITA
The Astrophysical Journal LettersOver the last several decades, extensive research has been conducted on the baryon cycles within cosmic structures, encompassing a broad mass range from dwarf galaxies to galaxy clusters. However, a notable gap in understanding the cosmic baryon cycle is
Dawei Li +9 more
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