由UE 2刺激的热不稳定冷却：扰流器团簇
Thermally Unstable Cooling Stimulated by Uplift: The Spoiler Clusters
摘要：
我们分析了5个星系团的钱德拉X射线观测结果，这些星系团的大气冷却时间、熵参数和中心星系内的冷却时间与自由落体时间之比分别低于1 Gyr、低于30 keV cm ^2和20 < tcool/tff < 50。这些热力学性质通常与分子云，明亮的H-α发射和中央星系中的恒星形成有关。然而，在ACCEPT数据库中，这些星团都没有可检测到的H-α，也没有显著的恒星形成率或可检测到的分子气体。其中，只有RBS 0533有一个可探测到的无线电/X射线气泡，这是在冷却大气中经常观察到的。没有隆起的高金属含量大气气体的迹象。尽管有突出的X射线气泡，但RBS 0533缺乏明显的分子气体水平。在这些系统中，冷气体是不存在的，可能是因为它们的射电源未能将低熵大气气体提升到冷却时间与自由落体时间之比低于1的高度。
英文摘要：
We analyzed Chandra X-ray observations of five galaxy clusters whose atmospheric cooling times, entropy parameters, and cooling time to free-fall time ratios within the central galaxies lie below 1 Gyr, below 30 keV cm^2, and between 20 < tcool/tff < 50, respectively. These thermodynamic properties are commonly associated with molecular clouds, bright H-alpha emission, and star formation in central galaxies. However, none of these clusters have detectable H-alpha indicated in the ACCEPT database, nor do they have significant star formation rates or detectable molecular gas. Among these, only RBS0533 has a detectable radio/X-ray bubble which are commonly observed in cooling atmospheres. Signatures of uplifted, high metallicity atmospheric gas are absent. Despite its prominent X-ray bubble, RBS0533 lacks significant levels of molecular gas. Cold gas is absent at appreciable levels in these systems perhaps because their radio sources have failed to lift low entropy atmospheric gas to an altitude where the ratio of the cooling time to the free-fall time falls below unity.
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