Optical radii of galaxy clusters
نویسندگان
چکیده
منابع مشابه
Optical Surveys for Galaxy Clusters
Optical surveys for galaxy clusters have been the major method for creating large cluster catalogs. We give a brief review of the history of optical searches of galaxy clusters, starting from that of Abell. The traditional application of this survey method suffers from contamination due to projection of galaxies along the line of sight, which becomes increasingly more severe at higher redshift....
متن کاملOptical/Infrared Survey of Galaxy Clusters
In this contribution the ongoing effort to build a statistical sample of clusters of galaxies over a wide range of redshifts to study the evolution of clusters and member galaxies is reviewed. The starting point for this project has been the list of candidate clusters identified from the I-band EIS-WIDE survey data. Since the completion of this survey, new optical/infrared observations have bec...
متن کاملThe optical/X-ray connection: ICM iron content and galaxy optical luminosity in 20 galaxy clusters
X-ray observations of galaxy clusters have shown that the intra-cluster gas has iron abundances of about one third of the solar value. These observations also show that part (if not all) of the intra-cluster gas metals were produced within the member galaxies. We present a systematic analysis of 20 galaxy clusters to explore the connection between the iron mass and the total luminosity of early...
متن کاملThe rms peculiar velocity of galaxy clusters for different cluster masses and radii
We investigate the rms peculiar velocity of galaxy clusters in the Lambda cold dark matter (ΛCDM) and tau cold dark matter (τCDM) cosmological models using N-body simulations. Cluster velocities for different cluster masses and radii are examined. To identify clusters in the simulations we use two methods: the standard friends-offriends (FOF) method and the method, where the clusters are define...
متن کاملConstraints on the asymptotic baryon fractions of galaxy clusters at large radii
While X-ray measurements have so far revealed an increase in the volume-averaged baryon fractions fb(r) of galaxy clusters with cluster radii r, fb(r) should asymptotically reach a universal value fb(∞) = fb, provided that clusters are representative of the Universe. In the framework of hydrostatic equilibrium for intracluster gas, we have derived the necessary conditions for fb(∞) = fb: The X-...
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ژورنال
عنوان ژورنال: The Astrophysical Journal
سال: 1995
ISSN: 0004-637X,1538-4357
DOI: 10.1086/175099