منابع مشابه
Substructure and Dynamics of the Fornax Cluster
We present the first dynamical analysis of a galaxy cluster to include a large fraction of dwarf galaxies. Our sample of 108 Fornax Cluster members measured with the UK Schmidt Telescope FLAIR-II spectrograph contains 55 dwarf galaxies ( or ). Ha emission shows that of the dwarfs are 15.5 1 b 1 18.0 216 1 M 1 213.5 36% 5 8% J B star forming, twice the fraction implied by morphological classific...
متن کاملThe Evolution of Cluster Substructure
Using Chandra archival data, we have begun a study to quantify the evolution of cluster morphology with redshift. To quantify cluster morphology, we use the power ratio method developed by Buote and Tsai (1995). Power ratios are constructed from moments of the twodimensional gravitational potential and are, therefore, related to a cluster’s dynamical state. Our sample will include around 50 clu...
متن کاملThe Evolution of Cluster Substructure with Redshift
Using Chandra archival data, we quantify the evolution of cluster morphology with redshift. To quantify cluster morphology, we use the power ratio method developed by Buote and Tsai (1995). Power ratios are constructed from moments of the two-dimensional gravitational potential and are, therefore, related to a cluster’s dynamical state. Our sample will include 40 clusters from the Chandra archi...
متن کاملNuclear substructure and dynamics
normal cell fate decisions are reiterated in subsequent larval stages. Examples include mutations in lin-4 and lin-29. Worms with such mutations do not express certain adult cell fates, despite being sexually mature (Figure 1). Is there conservation in heterochronic gene pathways? An important regulator of the larval-to-adult transition in worms, let-7, is conserved across diverse phyla, having...
متن کاملThe Evolution of Substructure in Galaxy, Group and Cluster Haloes I: Basic Dynamics
The hierarchical mergers that form the haloes of dark matter surrounding galaxies, groups and clusters are not entirely efficient, leaving substantial amounts of dense substructure, in the form of stripped halo cores or ‘subhaloes’, orbiting within these systems. Using a semi-analytic model of satellite dynamics, we study the evolution of haloes as they merge hierarchically, to determine how mu...
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ژورنال
عنوان ژورنال: Proceedings of the International Astronomical Union
سال: 2004
ISSN: 1743-9213,1743-9221
DOI: 10.1017/s1743921304000596