标题： 1321+045：一个在冷核星系团中的紧凑陡谱射电源 显示英文标题

标题： 1321+045: a Compact Steep Spectrum radio source in a cool-core galaxy cluster

摘要： 集群中心的吉赫兹峰值和紧凑陡谱（CSS）源为研究活动星系核反馈的最早阶段提供了机会，但迄今为止很少有此类源被详细研究。 我们展示了对1321+045的射电和X射线观测结果，这是一个位于红移为0.263的4.4 keV团中的CSS源。 该团具有强烈的冷却核心，可能由于一次小团合并引起的扰动触发了一段喷流活动，形成了16 kpc的射电瓣，发生在2.0 [+0.3,-0.2] Myr前。 然而，新的VLBA成像显示了一个约20 pc的喷流，其投影轴不同，可能只有几百年历史。 我们考虑了该系统的可能历史，包括一次或两次喷流活动时期。 虽然这个单一系统具有启发性，但对最年轻的集群中心射电源进行更广泛的研究是可取的。 显示英文摘要

摘要： Cluster-central gigahertz peak and compact steep spectrum (CSS) sources offer an opportunity to study the earliest phases of AGN feedback, but few have yet been examined in detail. We present results from radio and X-ray observations of 1321+045, a CSS source in a 4.4 keV cluster at z=0.263. The cluster has a strongly cooling core, and disturbances from a minor cluster merger may have triggered a period of jet activity which formed the 16 kpc radio lobes 2.0 [+0.3,-0.2] Myr ago. However, new VLBA imaging shows a ~20 pc jet on a different projected axis, which is probably only a few hundred years old. We consider possible histories for the system, with either one or two periods of jet activity. While this single system is informative, a broader study of the youngest cluster-central radio sources is desirable.