منابع مشابه
The Structure and Content of Galaxy Outskirts
The outer regions of galaxies are expected to contain important clues about the way in which galaxies are assembled. Although quantitative study of these parts has been severely limited in the past, breakthroughs are now being made thanks to the combination of wide-area star counts, deep HST imagery and 8-m class spectroscopy. I review here several recent results concerning substructure, star c...
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The cluster soft excess emission indicates the presence of large amounts of warm gas (T∼ 10 K) in the neighborhood of galaxy clusters. Among the clusters that display this phenomenon is the Coma cluster, the nearest rich galaxy cluster. The excess emission is more prominent at the cluster’s outskirts than at its center. Detailed studies of its large-scale emission – up to ∼2.6 Mpc from the clus...
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Collisions between galaxy clusters provide a unique opportunity to study matter in a parameter space which cannot be explored in our laboratories on Earth. In the standard 3CDM model, where the total density is dominated by the cosmological constant (3) and the matter density by cold dark matter (CDM), structure formation is hierarchical, and clusters growmostly by merging. Mergers of two massi...
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Galaxy cluster merger shocks are the main agent for the thermalization of the intracluster medium and the energization of cosmic ray particles in it. Shock propagation changes the state of the tenuous intracluster plasma, and the corresponding signal variations are measurable with the current generation of X-ray and Sunyaev–Zel’dovich (SZ) effect instruments. Additionally, non-thermal electrons...
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For the first time, we have systematically explored the population of discrete X-ray sources in the outskirts of early-type galaxies. Based on a broad sample of 20 galaxies observed with Chandra we detected overdensity of X-ray sources in their outskirts. The overdensity appears as halos of resolved sources around the galaxies. These halos are broader than the stellar light, extending out to at...
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ژورنال
عنوان ژورنال: Space Science Reviews
سال: 2019
ISSN: 0038-6308,1572-9672
DOI: 10.1007/s11214-018-0572-8