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    EPIC-XMM-Newton Observations of two nearby Galaxy Clusters

    機譯:EPIC-XMM-牛頓對兩個附近銀河星團的觀測

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    The XMM-Newton observatory, with its high throughput in combination with the EPIC CCD-cameras, is an ideal instrument to study extended sources like clusters of galaxies. Very deep observations of galaxy clusters reveal substructure on different levels: structure associated with bright galaxies, faint galaxies, or structure consistent with the merger of groups with the main cluster. Another indication of substructure is the deviation of the temperature of the intra-cluster gas from isothermality. We present XMM-Newton mosaic observations of the nearby clusters A3667 and A754. These clusters are good representatives of the different evolution stages that all clusters experience as they grow from mergers of smaller groups. Hence they show merging at different phases, which is also reflected in the different appearance of their temperature maps, pressure maps and entropy maps.
    機譯:XMM牛頓天文臺具有高通量,結合EPIC CCD相機,是研究擴展源(如星系團)的理想工具。對星系團的非常深入的觀察揭示了不同層次的子結構:與明亮星系,微弱星系相關的結構,或與各組與主星團合并相一致的結構。子結構的另一個指示是簇內氣體溫度與等溫度的偏差。我們介紹了附近的星團A3667和A754的XMM-牛頓鑲嵌觀測。這些集群很好地代表了各個集群從較小的集團合并而來時經歷的不同演化階段。因此,它們顯示出處于不同階段的合并,這也反映在其溫度圖,壓力圖和熵圖的不同外觀中。

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