Giant Ringlike Radio Structures Around Galaxy Cluster Abell 3376
Giant Ringlike Radio Structures Around Galaxy Cluster Abell 3376
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星系团 Abell 3376 周围的巨型环形射电结构
DOI：
10.1126/science.1131189
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发表时间：
2006
期刊：
影响因子：
56.9
通讯作者：
S. Paul
中科院分区：
文献类型：
--
作者：
J. Bagchi;F. Durret;G. L. Neto;S. Paul
在当前的冷暗物质宇宙学范式中，大规模结构是通过物质的层次聚类来组装的。在此过程中，兆秒差距（Mpc）尺度的宇宙冲击波发挥着重要作用，这种冲击波是在引力驱动的星系间物质超音速流到暗物质主导的塌缩结构（如煎饼、细丝和星系团）上产生的。在这里，我们报告了在丰富的 Abell 3376 星系团的外围发现的巨型（∼2 Mpc x 1.6 Mpc）环形非热射电发射结构的甚大阵列望远镜观测结果。这些结构可能追踪宇宙学大规模物质流难以捉摸的冲击波，这些冲击波的能量足以为它们提供动力。这些无线电源也可能是磁冲击加速能量高达 1018 至 1019 电子伏特的宇宙射线粒子的加速场所。
In the current paradigm of cold dark matter cosmology, large-scale structures are assembling through hierarchical clustering of matter. In this process, an important role is played by megaparsec (Mpc)–scale cosmic shock waves, arising in gravity-driven supersonic flows of intergalactic matter onto dark matter–dominated collapsing structures such as pancakes, filaments, and clusters of galaxies. Here, we report Very Large Array telescope observations of giant (∼2 Mpc by 1.6 Mpc), ring-shaped nonthermal radio-emitting structures, found at the outskirts of the rich cluster of galaxies Abell 3376. These structures may trace the elusive shock waves of cosmological large-scale matter flows, which are energetic enough to power them. These radio sources may also be the acceleration sites where magnetic shocks are possibly boosting cosmic-ray particles with energies of up to 1018 to 1019 electron volts.