论文标题
发现凤凰星系集群中心的无线电飞机
Discovery of Radio Jets in Phoenix Galaxy Cluster Center
论文作者
论文摘要
我们报告了澳大利亚望远镜紧凑阵列（ATCA）的结果15毫米观察到凤凰星系群集，该集群在集群中心具有极端的星状簇星系（BCG）。我们在BCG周围进行了空间分辨的无线电发射，并发现了从BCG的活性银河核（AGN）延伸的弥漫性双极和条形形状结构。它们可能是无线电飞机/叶，其大小约为10-20 kpc，位置与X射线腔对齐。如果我们假设无线电飞机/叶随着声音速度扩展，则它们的年龄估计为约10 Myr。我们还发现中心附近的紧凑型无线电排放，并暗示它们是另一种年轻的年轻双极喷气机，年龄约为1 Myr。此外，我们发现了AGN周围的延长无线电发射，并通过考虑通过分子团部分吸收的同步辐射，从温暖的离子气体中自由发射，以及来自尘埃圆与胶状含量的旋转粉尘发射，讨论了该组件是冷却流量的产物的可能性。
We report the results of the Australia Telescope Compact Array (ATCA) 15 mm observation of the Phoenix galaxy cluster possessing an extreme star-burst brightest cluster galaxy (BCG) at the cluster center. We spatially resolved radio emission around the BCG, and found diffuse bipolar and bar-shape structures extending from the active galactic nucleus (AGN) of the BCG. They are likely radio jets/lobes, whose sizes are ~10-20 kpc and locations are aligned with X-ray cavities. If we assume that the radio jets/lobes expand with the sound velocity, their ages are estimated to be ~10 Myr. We also found compact radio emissions near the center and suggest that they are another young bipolar jets with ~1 Myr of age. Moreover, we found extended radio emission surrounding the AGN and discussed the possibility that the component is a product of the cooling flow, by considering synchrotron radiation partially absorbed by molecular clumps, free-free emission from the warm ionized gas, and the spinning dust emission from dusty circum-galactic medium.
