论文标题
部分可观测时空混沌系统的无模型预测
Chandra view of Abell 407: the central compact group of galaxies and the interaction between the radio AGN and the ICM
论文作者
论文摘要
Abell 407（A407）是一个独特的星系群集，该集群在30 kpc的半径区域内举办了一个九个星系中心的九组（在这项工作中称为“ Zwicky's nonet'; G1 -G9）。簇芯还容纳了发光的无线电活性银河核（AGN），4C 35.06，旋转旋转的喷气机延伸超过200 kpc。通过对A407的44 KS Chandra观察，我们表征了其内部介质（ICM）和中央星系的X射线特性。 A407的平均X射线温度为2.7 keV，$ m_ {200} $为$ 1.9 \ times 10^{14} {m _ {\ odot}} $。我们建议A407在$ r <60 $ kpc的尺度上具有弱酷芯，并且在其中心非常<1 $ -2 $ -2 kpc半径，这是一种与强大的无线电AGN相关的小星系电晕。我们还得出结论，AGN 4C 35.06宿主星系很可能是G3。我们建议中央星系正在进行“缓慢合并”程序。合并时间尺度的范围为$ 0.3 \ sim2.3 $ gyr，未来最亮的集群星系（BCG）的恒星质量为$ 7.4 \ times10^{11} m _ {\ odot} $。我们发现与无线电喷气机重叠的区域具有较高的温度和金属性。这与AGN反馈活动一致。中央熵高于其他簇，这可能是由于AGN反馈和/或合并活动。有了所有这些事实，我们建议A407是当地宇宙中一个独特而稀有的系统，可以帮助我们理解大型BCG的形成。
Abell 407 (A407) is a unique galaxy cluster hosting a central compact group of nine galaxies (named as 'Zwicky's Nonet'; G1 - G9 in this work) within a 30 kpc radius region. The cluster core also hosts a luminous radio active galactic nucleus (AGN), 4C 35.06 with helically twisted jets extending over 200 kpc. With a 44 ks Chandra observation of A407, we characterize the X-ray properties of its intracluster medium (ICM) and central galaxies. The mean X-ray temperature of A407 is 2.7 keV and the $M_{200}$ is $1.9 \times 10^{14} {M_{\odot}}$. We suggest that A407 has a weak cool core at $r < 60$ kpc scales and at its very center, $< 1$-2 kpc radius, a small galaxy corona associated with the strong radio AGN. We also conclude that the AGN 4C 35.06 host galaxy is most likely G3. We suggest that the central group of galaxies is undergoing a `slow merge' procedure. The range of the merging time-scale is $0.3\sim2.3$ Gyr and the stellar mass of the future brightest cluster galaxy (BCG) will be $7.4\times10^{11} M_{\odot}$. We find that the regions which overlap with the radio jets have higher temperature and metallicity. This is consistent with AGN feedback activity. The central entropy is higher than that for other clusters, which may be due to the AGN feedback and/or merging activity. With all these facts, we suggest that A407 is a unique and rare system in the local universe that could help us to understand the formation of a massive BCG.
