Chandra view of Abell 407: the central compact group of galaxies and the interaction between the radio AGN and the ICM
Chandra view of Abell 407: the central compact group of galaxies and the interaction between the radio AGN and the ICM
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Abell 407 的钱德拉视图：中央致密星系团以及射电 AGN 和 ICM 之间的相互作用
DOI：
10.1093/mnras/stac355
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发表时间：
2022
影响因子：
4.8
通讯作者：
Kraft, Ralph
中科院分区：
文献类型：
--
作者：
Geng, Chao;Ge, Chong;Lal, Dharam V.;Sun, Ming;Ji, Li;Xu, Haiguang;Liu, Wenhao;Hardcastle, Martin;Forman, William;Kraft, Ralph
阿贝尔407（A407）是一个独特的星系团，在30 kpc半径范围内拥有一个由9个星系组成的中央致密星系群（命名为“Zwicky's Nonet”; G1-G9）。星系团核心还拥有一个明亮的射电活动星系核（AGN），4C 35.06，螺旋扭曲的喷流延伸超过200 kpc。利用A407的44 ksChandra观测资料，研究了其团内介质和中心星系的X射线性质。A407的平均X射线温度为2.7keV，M200的平均X射线温度为2.7keV。我们认为，A407有一个弱冷核，其尺度< 60 kpc，在其中心，半径<1-2 kpc，一个小的星系日冕与强射电活动星系核有关。我们还得出结论，AGN 4C 35.06的宿主星系最有可能是G3。我们认为，中央星系群正在经历一个“缓慢合并”的过程。合并时标的范围为0.3 ~ 2.3 Gyr，未来最亮的星团星系（BCG）的质量为。我们发现与射电喷流重叠的区域具有较高的温度和金属丰度。这与活动星系核的反馈活动是一致的。星系团的中心熵比其他星系团的中心熵高，这可能是由于活动星系核的反馈和/或合并活动。有了所有这些事实，我们认为A407是本地宇宙中一个独特而罕见的系统，可以帮助我们了解大规模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 ksChandraobservation of A407, we characterize the X-ray properties of its intracluster medium and central galaxies. The mean X-ray temperature of A407 is 2.7 keV and theM200is. We suggest that A407 has a weak cool core atr< 60 kpc scales and at its very centre, <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 ∼ 2.3 Gyr and the stellar mass of the future brightest cluster galaxy (BCG) will be. We find that the regions that 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.