An excess of small-scale gravitational lenses observed in galaxy clusters

doi:10.1126/science.aax5164

GSTDTAP > 气候变化

DOI	10.1126/science.aax5164
	An excess of small-scale gravitational lenses observed in galaxy clusters
	Massimo Meneghetti; Guido Davoli; Pietro Bergamini; Piero Rosati; Priyamvada Natarajan; Carlo Giocoli; Gabriel B. Caminha; R. Benton Metcalf; Elena Rasia; Stefano Borgani; Francesco Calura; Claudio Grillo; Amata Mercurio; Eros Vanzella
	2020-09-11
发表期刊	Science
出版年	2020
英文摘要	The large mass of a galaxy cluster deflects light from background objects, a phenomenon known as gravitational lensing. The large-scale gravitational lens caused by the whole cluster can be modified by smaller-scale mass concentrations within the cluster, such as individual galaxies. Meneghetti et al. examined these small-scale gravitational lenses in observations of 11 galaxy clusters. They found an order of magnitude more small-scale lenses than would be expected from cosmological simulations. The authors conclude that there is an unidentified problem with either prevailing simulation methods or standard cosmology. Science , this issue p. [1347][1] Cold dark matter (CDM) constitutes most of the matter in the Universe. The interplay between dark and luminous matter in dense cosmic environments, such as galaxy clusters, is studied theoretically using cosmological simulations. Observations of gravitational lensing are used to characterize the properties of substructures—the small-scale distribution of dark matter—in clusters. We derive a metric, the probability of strong lensing events produced by dark-matter substructure, and compute it for 11 galaxy clusters. The observed cluster substructures are more efficient lenses than predicted by CDM simulations, by more than an order of magnitude. We suggest that systematic issues with simulations or incorrect assumptions about the properties of dark matter could explain our results. [1]: /lookup/doi/10.1126/science.aax5164
领域	气候变化 ; 资源环境
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引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/294095
专题	气候变化资源环境科学
推荐引用方式 GB/T 7714	Massimo Meneghetti,Guido Davoli,Pietro Bergamini,et al. An excess of small-scale gravitational lenses observed in galaxy clusters[J]. Science,2020.
APA	Massimo Meneghetti.,Guido Davoli.,Pietro Bergamini.,Piero Rosati.,Priyamvada Natarajan.,...&Eros Vanzella.(2020).An excess of small-scale gravitational lenses observed in galaxy clusters.Science.
MLA	Massimo Meneghetti,et al."An excess of small-scale gravitational lenses observed in galaxy clusters".Science (2020).