z=2.5恒星形成星系中Ly $α$发射体的相似性和唯一性
Similarities and uniqueness of Ly$α$ emitters among star-forming galaxies at z=2.5
摘要：
我们用斯巴鲁望远镜上的斯巴鲁定焦相机进行了深窄带成像调查，并在UDS-CANDELS场中构造了z=2.53的Ly $α$发射体（LAEs）样品，其中H $α$发射体（HAE）样品在相同的红移下已经从我们以前的近红外窄带观测中获得。深窄带和多宽带的数据使我们能够找到LAE的恒星质量和恒星形成率（SFR）下降到$\gtrsim$ $10^8$ M $_\odot$和$\gtrsim$ 0.2 M $_\odot$ /年，分别。我们发现，LAEs位于沿着相同的质量SFR序列跟踪正常的恒星形成星系，如HAE，但对一个显着较低的质量制度。同样，LAEs似乎与典型的恒星形成星系有着相同的质量-大小关系，除了大质量LAEs，它们往往显示出显着的紧凑尺寸。我们确定了一个蓬勃发展的质量增长的LAEs的中心部分：在LAEs的中心区域的恒星质量密度增加，其总星系质量的增长。另一方面，我们在大多数HAE的发射中没有看到Ly $α$线。相反，我们发现，赖氨酸$α$功能是不存在的或在吸收（赖氨酸$α$吸收剂; LAAs），其吸收强度可能会增加与红的紫外连续斜率。我们证明，深Ly $α$窄带成像像这项研究是能够搜索不仅LAEs，但也LAAs在一定的红移切片。这项工作表明，LAEs跟踪正常的恒星形成星系在低质量的制度，而他们仍然是一个独特的人口，因为大多数的HAE不是LAEs。
英文摘要：
We conducted a deep narrow-band imaging survey with the Subaru Prime Focus Camera on the Subaru Telescope and constructed a sample of Ly$α$ emitters (LAEs) at z=2.53 in the UDS-CANDELS field where a sample of H$α$ emitters (HAEs) at the same redshift is already obtained from our previous narrow-band observation at NIR. The deep narrow-band and multi broadband data allow us to find LAEs of stellar masses and star-formation rates (SFRs) down to $\gtrsim$$10^8$ M$_\odot$ and $\gtrsim$0.2 M$_\odot$/yr, respectively. We show that the LAEs are located along the same mass-SFR sequence traced by normal star-forming galaxies such as HAEs, but towards a significantly lower mass regime. Likewise, LAEs seem to share the same mass--size relation with typical star-forming galaxies, except for the massive LAEs, which tend to show significantly compact sizes. We identify a vigorous mass growth in the central part of LAEs: the stellar mass density in the central region of LAEs increases as their total galaxy mass grows. On the other hand, we see no Ly$α$ line in emission for most of the HAEs. Rather, we find that the Ly$α$ feature is either absent or in absorption (Ly$α$ absorbers; LAAs), and its absorption strength may increase with reddening of the UV continuum slope. We demonstrate that a deep Ly$α$ narrow-band imaging like this study is able to search for not only LAEs but also LAAs in a certain redshift slice. This work suggests that LAEs trace normal star-forming galaxies in the low-mass regime, while they remain as a unique population because the majority of HAEs are not LAEs.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
