论文标题
Centaurus簇的群内培养基的速度结构
The velocity structure of the Intracluster Medium of the Centaurus cluster
论文作者
论文摘要
尽管ICM速度结构对理解群集的重要性很少，但几乎没有直接测量。我们使用XMM-Newton观测值对Centaurus群集的速度结构进行了详细分析。使用使用CU KA仪器线作为参考的新EPIC-PN能量量表校准，我们能够获得速度测量值，但不确定性降低至$ΔV\ sim 79 $ km/s。我们为速度，金属性，温度，密度，熵和压力创建2D光谱图，空间分辨率为0.25'。我们发现，ICM的速度结构类似于主星系的速度结构，而冷锋可能以低速垂直于我们的视线范围移动。最后，我们发现了<25 \％的动力学成分对半径$> 30 $ kpc的总能量预算的贡献。
There are few direct measurements of ICM velocity structure, despite its importance for understanding clusters. We present a detailed analysis of the velocity structure of the Centaurus cluster using XMM-Newton observations. Using a new EPIC-pn energy scale calibration, which uses the Cu Ka instrumental line as reference, we are able to obtain velocity measurements with uncertainties down to $Δv \sim 79$ km/s. We create 2D spectral maps for the velocity, metallicity, temperature, density, entropy and pressure with an spatial resolution of 0.25'. We have found that the velocity structure of the ICM is similar to the velocity structure of the main galaxies while the cold fronts are likely moving in a plane perpendicular to our line of sight with low velocity. Finally, we have found a contribution from the kinetic component of <25\% to the total energetic budget for radius $>30$ kpc.
