权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Do black holes regulate the growth of massive galaxies?

黑洞是否调节大质量星系的生长？

基本信息

批准号：
1874143
负责人：
金额：
--
依托单位：
University of Hertfordshire
依托单位国家：
英国
项目类别：
Studentship
财政年份：
2016
资助国家：
英国
起止时间：
2016 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=studentship-1874143
关键词：
Do black holes regulate growth

项目摘要

This project will exploit data from the James Clerk Maxwell Telescope (JCMT) Cosmology Legacy Survey (S2CLS)to investigate the link between accretion on to black holes and the formation of massive galaxies in the early Universe. The S2CLS is the largest of the JCMT Legacy Surveys and is providing the first samples of thousands of extragalacticsources selected in the submillimetre (submm) wavebands, an order-of-magnitude improvement in thesample sizes of previous surveys at these wavelengths. The submm atmospheric window allow us to access the redshifted far-infrared emissionfrom high-redshift galaxies and active galactic nuclei (AGN) thus pin-pointing intense star -formation activity in the early Universe associated with the assembly of massive galaxies and black holes. Black holes are thought to play a key role in the galaxy formation process by regulating the growth of the stellar spheroid via a feedback process, i.e. a powerful wind from the accretion disk. Recent controversy in this field has come from studies with conflicting results. One high profile study claims that vigorous star formation is not observed in AGN with the highest accretion activity but is present in lower luminosity AGN. In contrast, a competing study finds no dependence of star-formtion rate on acretion activity. The former claim their result is evidence that luminous AGN suppress star formation while the latter conclude that no such claim can be made...a debate that is ongoing! The proposed project will use the unique characteristics of the S2CLS dataset to improve on previous studies and answer the question posed in the title...'Do black holes regulate the growth of massive galaxies?'

该项目将利用詹姆斯·克拉克·麦克斯韦望远镜（JCMT）的宇宙学遗产调查（S2CLS）的数据，研究早期宇宙中黑洞的吸积与大质量星系形成之间的联系。S2CLS是JCMT遗留巡天计划中最大的一次，提供了第一批亚毫米波段的数千个星系外源样本，比之前巡天在这些波段的样本大小有了一个数量级的提高。亚毫米大气窗口使我们能够获得来自高红移星系和活动星系核（AGN）的红移远红外发射，从而精确定位早期宇宙中与大质量星系和黑洞聚集相关的强烈恒星形成活动。黑洞被认为在星系形成过程中发挥着关键作用，它通过反馈过程（即来自吸积盘的强大风）调节恒星球体的生长。最近在这一领域的争议来自于结果相互矛盾的研究。一项引人注目的研究声称，在吸积活动最高的AGN中没有观察到强烈的恒星形成，但在光度较低的AGN中存在。相反，另一项竞争性研究发现，恒星形成速率与吸积活动无关。前者声称他们的结果是发光AGN抑制恒星形成的证据，而后者得出的结论是，这种说法是不可能的……一场正在进行的辩论！拟议的项目将利用S2CLS数据集的独特特征来改进以前的研究，并回答标题中提出的问题……“黑洞会调节大质量星系的成长吗？”