在英仙座星系团的维里半径处是否有一个巨大的冷锋？
Is there an enormous cold front at the virial radius of the Perseus cluster?
摘要：
我们提出了新的XMM-牛顿观测扩展到维里半径以西的英仙座集群的马赛克。以前使用ROSAT进行的研究报告了西部表面亮度的大量过剩，可能是大规模气体晃动的结果，但缺乏空间分辨率和深度来确定这种过剩是否位于冷锋之后。在我们新的XMM观测中，我们发现在星系团西边的维里半径（1.7Mpc）附近，X射线表面亮度有一个尖锐的边缘，其宽度与平均自由程相当，用朱雀星的数据测量了这个边缘的温度，结果表明，在这个边缘之外，温度急剧上升。所有这些特性都与这个边缘是在星系团中观测到的最大冷锋相一致。我们还发现了第二个边缘向西，1.2Mpc的核心，这似乎也是一个冷锋。我们的研究结果表明，磁场能够稳定的冷锋对湍流的所有方式到集群维里半径。通过与数值模拟结果的比较，我们发现这些大冷锋需要大的碰撞参量、低质量比的并合，这样才能在不破坏团核的情况下产生快速的气体运动。
英文摘要：
We present new XMM-Newton observations extending the mosaic of the Perseus cluster out to the virial radius to the west. Previous studies with ROSAT have reported a large excess in surface brightness to the west, possibly the result of large scale gas sloshing, but lacked the spatial resolution and depth to determine if this excess lay behind a cold front. In our new XMM observations we have found that there is a sharp edge in X-ray surface brightness near the cluster virial radius (1.7Mpc) to the west, with a width comparable to the mean free path. The temperature measurements obtained with Suzaku data across this edge show that the temperature increases sharply outside this edge. All of these properties are consistent with this edge being the largest cold front ever observed in a galaxy cluster. We also find a second edge to the west, 1.2Mpc from the core, which also appears to be a cold front. Our results indicate that magnetic fields are able to stabilize the cold fronts against turbulence all the way out to the cluster virial radius. By comparing with numerical simulations, we find that these large cold fronts require large impact parameter, low mass ratio mergers which can produce fast gas motions without destroying the cluster core.
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