Probing the Active Phase of Cluster Galaxy Evolution with Active Galactic Nuclei

在过去，大质量星系团中的星系通常在其内部区域有额外的能量来源。 但是这些所谓的活动星系核（AGN）的发生率随着时间的推移而下降。 这种下降意味着拥挤的星系邻域中的星系正在进化。 为了帮助理解这种演变，研究小组将分析大约2000个遥远星系团在无线电、红外和光学波长上的观测结果。 高级团队成员将培训初级团队成员。 该团队还将与佛罗里达的大学前教育和培训中心合作。 通过STEM合作，该团队将开发培训高中学生和教师的材料。该团队将利用观测结果调查红移约为1的大质量星系团中活动星系核的分布、频率和性质。 该团队的目标是（1）量化活动星系核的空间分布作为环境和红移的函数，以隔离触发活动星系核的物理因素，（2）确定星系团的晕质量对与其中心星系相关的活动星系核的影响，以及（3）限制最亮星系团中活动星系核的占空比和能量反馈。

In the past, galaxies in massive clusters often had extra sources of energy in their inner regions. But the incidence of these so-called active galactic nuclei (AGNs) has declined over time. This decline means that galaxies in crowded galaxy neighborhoods are evolving. To help understand that evolution, the team will analyze observations of about 2000 distant clusters at radio, infrared and optical wavelengths. Senior team members will train junior team members. The team will also partner with Florida's Center for Precollegiate Education and Training. Via that STEM partnership, the team will develop materials to train high-school students and teachers.The team will use observations to investigate the distribution, frequency, and properties of AGNs in massive clusters of galaxies at a redshift of about one. The team's goals are (1) to quantify the spatial distribution of AGNs as a function of environment and redshift, to isolate the physical factors that trigger AGNs, (2) to determine the impact of a cluster's halo mass on the AGN associated with its central galaxy, and (3) to constrain the duty cycle and energetic feedback from the AGNs in the brightest cluster galaxies.