高红移星系的结构与形态研究

发布时间：2018-05-03 04:27

本文选题：星系形态 + 星系结构　；参考：《中国科学:物理学力学天文学》2017年04期

【摘要】：本文主要介绍近年来利用哈勃空间望远镜第三代宽场相机的近红外成像对高红移星系结构形态的研究.对红移1-3区间内宁静星系的研究发现其结构较近邻等质量宁静星系更致密,且有很显著的随红移演化趋势.最近的观测证据建议高红移致密宁静星系可能遵循从内而外的演化图像,干子并合可能在其演化过程中扮演了很重要的角色.在红移z1,正常恒星形成星系的结构演化符合等级成团模型的预言.高红移星暴星系,包括极亮红外星系、尘埃遮蔽星系和亚毫米星系等,多数显示了并合的形态特征,表明主并合可能是触发高红移星暴星系中剧烈星爆活动的主要机制.对高红移活动星系核宿主星系结构形态的研究显示了不同的结果:中低光度X射线选活动星系核宿主星系与比较样本中的正常星系相比并不具有显著更高的并合比例;而高光度类星体宿主星系却具有很高的并合比例.该结果表明主并合可能只在高光度活动星系核的核活动触发过程中扮演主要角色.诸多观测事实表明星暴星系、致密恒星形成星系、类星体和致密宁静星系可能处于同一演化序列之上,是高红移大质量星系演化过程中的不同阶段.
[Abstract]:In this paper, the near infrared imaging of the third generation wide field camera of Hubble Space Telescope (Hubble Space Telescope) is introduced. The study of the quiet galaxies in the region of redshift 1-3 shows that their structures are denser than those of their neighbours with the same mass and quiet galaxies, and there is a significant tendency of redshift evolution. Recent observational evidence suggests that Gao Hong's migration of dense and quiet galaxies may follow an evolutional image from the inside out, and that dry son merging may play an important role in its evolution. At redshift z1, the structural evolution of normal star-forming galaxies conforms to the predictions of hierarchical cluster models. Most of the Gao Hong star shifting storm galaxies, including very bright infrared galaxies, dust obscured galaxies and submillimeter galaxies, show the morphological characteristics of convergence, indicating that the main combination may be the main mechanism that triggers the intense star burst in the Gao Hong star moving storm galaxy. Studies on the structure and morphology of the host galaxies of Gao Hong's moving AGNs show different results: the host galaxies of AGNs selected by low and medium luminosity X-ray have no significant and higher amalgamation ratio compared with the normal galaxies in the comparative sample; The host galaxies of high luminosity quasars have a high ratio of merging. The results show that the main merging may only play a major role in the nuclear activation of high luminosity active galactic nuclei. Many observations show that starburst galaxies, dense star forming galaxies, quasars and dense quiet galaxies may be on the same evolutionary sequence, which is different stages in the evolution of Gao Hong's large mass galaxies.
【作者单位】：山东大学空间科学研究院山东省光学天文与日地空间环境重点实验室;大理大学天文与科技史研究所;
【基金】：国家自然科学基金资助项目(编号:11203023,11303002,11433005)
【分类号】：P152

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