Environmental Effects on Galaxies in Clusters
نویسندگان
چکیده
منابع مشابه
Environmental Effects on Late-Type Galaxies in Nearby Clusters
The transformations taking place in late-type galaxies in the environment of rich clusters of galaxies at z = 0 are reviewed. From the handful of late-type galaxies that inhabit local clusters, whether they were formed in-situ and survived as such, avoiding transformation or even destruction or if they are newcomers that recently infall from outside, we can learn an important lesson on the late...
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The observed morphological evolution since z ∼ 0.5 within galaxy clusters provides evidence for a hierarchical universe. This evolution is driven by dynamical effects that operate within the cluster environment – suppression of star-formation by ram-pressure and viscous stripping of the intra-galactic medium and tidal heating of disks by grav-itational encounters. 1. Evidence for a hierarchical...
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A simple model is constructed to evaluate the change of star formation rate of a disk galaxy due to environmental e†ects in clusters of galaxies. Three e†ects are investigated : (1) tidal force from the potential well of the cluster, (2) increase of external pressure when the galaxy plows into the intracluster medium, and (3) high-speed encounters between galaxies. General analysis indicates th...
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High-redshift clusters of galaxies show an over-abundance of spirals by a factor of 2 − 3, and the corresponding under-abundance of S0 galaxies, relative to the nearby clusters. This morphological evolution can be explained by tidal interactions with neighboring galaxies and with the hierarchically growing cluster halo. The efficiency of tidal interactions depends on the size and structure of t...
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Despite their apparent fragile appearance, dwarf spheroidals are the most common galaxy type in clusters. In this paper we consider some of the issues associated with two major models for the origin of these dwarfs: primeval galaxies which formed with the cluster and the modification of accreted systems. We argue that the present observational evidence, derived from the Virgo and Perseus cluste...
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ژورنال
عنوان ژورنال: Symposium - International Astronomical Union
سال: 1983
ISSN: 0074-1809
DOI: 10.1017/s0074180900033234