4D Eigenvector 1背景下的类星体：沿着记忆车道漫步
Quasars in the 4D Eigenvector 1 Context: A stroll down memory lane
摘要：
最近，一些悲观主义者表示，自发现类星体以来的50多年里，我们在理解类星体方面缺乏进展。值得回顾一下已经取得的一些进展-但仍然处于雷达之下-也许是因为很少有人在这一领域从事光学/紫外光谱学的研究。利用本征向量技术在理解类星体现象学方面取得了巨大的进展。4D特征向量1上下文提供了类星体的替代H-R图，其源主序列由与视线方向卷积的爱丁顿比驱动。了解位于主序两端的类星体（所谓的星族A和B源）之间的显著差异，为建立类星体物理学、几何学和运动学的统一模型打开了大门。我们回顾了过去15年来取得的一些进展，并指出了尚未解决的问题。
英文摘要：
Recently some pessimism has been expressed about our lack of progress in understanding quasars over the 50+ year since their discovery. It is worthwhile to look back at some of the progress that has been made - but still lies under the radar - perhaps because few people are working on optical/UV spectroscopy in this field. Great advances in understanding quasar phenomenology have emerged using eigenvector techniques. The 4D eigenvector 1 context provides a surrogate H-R Diagram for quasars with a source main sequence driven by Eddington ratio convolved with line-of-sight orientation. Appreciating the striking differences between quasars at opposite ends of the main sequence (so-called population A and B sources) opens the door towards a unified model of quasar physics, geometry and kinematics. We present a review of some of the progress that has been made over the past 15 years, and point out unsolved issues.
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