M87中金属的气体晃动输运
Metal transport by gas sloshing in M87
摘要：
我们提出了一个XMM-牛顿镶嵌覆盖附近的室女星系团的中央~200千秒差距的结果。我们关注的是最亮的星系团M87外围强烈的表面亮度不连续性。使用XMM-牛顿和朱雀，我们得到准确的温度和金属丰度分布在这个功能，并表明这是一个冷锋可能是由于晃动的处女座ICM。它还与化学成分的不连续性有关。锋面内部明亮区域的气体比锋面外部的气体含铁量高出约40%，这表明晃动在通过ICM输送金属方面起着重要作用。首次对冷锋输送的Fe质量进行了定量估算。这相当于~6%的总铁质量的径向范围内受到晃动的影响，显着超过了在同一集群核心的活动星系核运输的金属量。非常低的铁丰度只有~0.2太阳能直接在冷锋外，半径为90千秒差距，表明我们正在目睹第一手的高金属量气体运输到一个原始的区域，其丰富的是典型的集群郊区。Mg/Fe和O/Fe丰度比在M87的中心和冷锋的微弱侧之间的整个径向范围内保持近似恒定，这不仅需要Fe而且还需要核心塌陷型超新星产物的中心峰值分布。这个峰值可能源于在原星团阶段BCG组装时触发的恒星形成。
英文摘要：
We present the results of an XMM-Newton mosaic covering the central ~200 kpc of the nearby Virgo cluster. We focus on a strong surface brightness discontinuity in the outskirts of the brightest cluster galaxy, M87. Using both XMM-Newton and Suzaku, we derive accurate temperature and metallicity profiles across this feature and show that it is a cold front probably due to sloshing of the Virgo ICM. It is also associated with a discontinuity in the chemical composition. The gas in the inner, bright region of the front is ~40% more abundant in Fe than the gas outside the front, suggesting the important role of sloshing in transporting metals through the ICM. For the first time, we provide a quantitative estimate of the mass of Fe transported by a cold front. This amounts to ~6% of the total Fe mass within the radial range affected by sloshing, significantly more than the amount of metals transported by the AGN in the same cluster core. The very low Fe abundance of only ~0.2 solar immediately outside the cold front at a radius of 90 kpc suggests we are witnessing first-hand the transport of higher metallicity gas into a pristine region, whose abundance is typical of the cluster outskirts. The Mg/Fe and O/Fe abundance ratios remain approximately constant over the entire radial range between the centre of M87 and the faint side of the cold front, which requires the presence of a centrally peaked distribution not only for Fe but also for core-collapse type supernova products. This peak may stem from the star formation triggered as the BCG assembled during the protocluster phase.
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