被大量相对论电子包围的星系团
Galaxy clusters enveloped by vast volumes of relativistic electrons
摘要：
星系团的中心区域充满了磁场和相对论电子。当团簇合并时，磁场被放大，相对论电子被团簇内介质中的湍流重新加速。这些电子达到1 - 10 GeV的能量，并在磁场的存在下，产生弥漫的无线电晕，通常覆盖面积约1平方兆秒差距。在这里，我们报告了四个星系团的观测结果，它们的射电晕嵌入在更广泛的、弥散的射电辐射中，其体积比射电晕大30倍。这些较大特征的发射率比射电晕的发射率低约20倍。我们的结论是，相对论电子和磁场远远超出了无线电晕，在星系团的外部区域的物理条件是相当不同的无线电晕。
英文摘要：
The central regions of galaxy clusters are permeated by magnetic fields and filled with relativistic electrons. When clusters merge, the magnetic fields are amplified and relativistic electrons are re-accelerated by turbulence in the intra cluster medium. These electrons reach energies of 1 -- 10 GeV and, in the presence of magnetic fields, produce diffuse radio halos that typically cover an area of ~1 square Mpc. Here we report observations of four clusters whose radio halos are embedded in much more extended, diffuse radio emission, filling a volume 30 times larger than that of radio halos. The emissivity in these larger features is about 20 times lower than the emissivity in radio halos. We conclude that relativistic electrons and magnetic fields extend far beyond radio halos, and that the physical conditions in the outer regions of the clusters are quite different from those in the radio halos.
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