论文标题
星系群的凉爽核心的化学富集
Chemical enrichment in the cool core of the Centaurus cluster of galaxies
论文作者
论文摘要
在这里，我们介绍了500公斤Chandra和XMM-Newton观察到Contaurus群集的结果。我们研究了带有CCD探测器的簇内培养基中的O，Mg，Si，S，Ca，Ca，Mn，Fe和Ni丰度的空间分布，以及带有反射光谱仪（RGS）的N，O，NE，MG，FE和Ni的空间分布。大多数元素的丰度在中央18 Arcsec中显示出急剧下降，尽管不同的检测器和原子代码具有明显不同的值。上述元素的丰度比（包括带有RGS的NE/FE）显示出相对平坦的径向分布。在具有主要的Fe-L线的最内向地区，绝对丰度的测量很具有挑战性。例如，AtomDB和Specact分别为最内向区域的光谱提供了Fe = 0.5和1.4太阳能。这些结果表明，原子数据和响应矩阵中的某些系统不确定性至少部分导致丰度下降，而不是金属耗尽到冷尘中。除了超高n/fe和ni/fe，次极ne/fe和mg/fe之外，丰度模式与太阳能组成相符。使用最新的超新星核合成模型重现的整个模式都具有挑战性。观察到的超极性N/O和与恒星金属度曲线的可比MG丰度相当，这意味着质量损失的风在最明亮的簇星系中占主导地位。太阳能CR/FE和Mn/Fe比率表明IA型超新星的近脑和亚chandrasekhar质量爆炸的显着贡献。
Here we present results from over 500 kiloseconds Chandra and XMM-Newton observations of the cool core of the Centaurus cluster. We investigate the spatial distributions of the O, Mg, Si, S, Ar, Ca, Cr, Mn, Fe, and Ni abundances in the intracluster medium with CCD detectors, and those of N, O, Ne, Mg, Fe, and Ni with the Reflection Grating Spectrometer (RGS). The abundances of most of the elements show a sharp drop within the central 18 arcsec, although different detectors and atomic codes give significantly different values. The abundance ratios of the above elements, including Ne/Fe with RGS, show relatively flat radial distributions. In the innermost regions with the dominant Fe-L lines, the measurements of the absolute abundances are challenging. For example, AtomDB and SPEXACT give Fe = 0.5 and 1.4 solar, respectively, for the spectra from the innermost region. These results suggest some systematic uncertainties in the atomic data and response matrices at least partly cause the abundance drop rather than the metal depletion into the cold dust. Except for super-solar N/Fe and Ni/Fe, sub-solar Ne/Fe, and Mg/Fe, the abundance pattern agrees with the solar composition. The entire pattern is challenging to reproduce with the latest supernova nucleosynthesis models. Observed super-solar N/O and comparable Mg abundance to stellar metallicity profiles imply the mass-loss winds dominate the intracluster medium in the brightest cluster galaxy. The solar Cr/Fe and Mn/Fe ratios indicate a significant contribution of near- and sub-Chandrasekhar mass explosions of Type Ia supernovae.
