论文标题
Popiii星系的诊断和早期宇宙中直接崩溃的黑洞
Diagnostics for PopIII galaxies and Direct Collapse Black Holes in the early universe
论文作者
论文摘要
即将到来的观察设施将探索早期宇宙的常规，可能以非常低的金属性探测大量星系。因此，重要的是要有能够在如此低的金属性制度中牢固识别和区分不同类别的对象的诊断。我们使用新的光电子化模型来开发涉及各种Nebular线的诊断图。我们表明，这些图的组合允许在早期宇宙中识别和区分以下对象类别：popiii和直接崩溃的黑洞（DCBH），在原始环境中，Popiii和嵌入在略有丰富的ISM（z〜10^{-5} -10^{ - 5} -10^^{-4} {-4} {-4}）中（Z〜10^{ - 5}^{ - 4}），（in Metal and in Metal insm incem and popiii and dcbh），（涉及REST框架光学线的诊断（JWST可以访问）具有更好的歧视功能，但REST-FRAME UV诊断也可以提供非常有用的信息。有趣的是，我们发现诸如[OIII] 5007A和CIV 1549A之类的金属线可能保持相对强（分别为0.1-1相对H-Beta和Heii 1640a），即使在极端金属较差的环境中（Z〜10^{-5} -5} -10^{-4}），这可能是Popiiii andding popiii anded calaxies and Dc。
Forthcoming observational facilities will make the exploration of the early universe routine, likely probing large populations of galaxies at very low metallicities. It will therefore be important to have diagnostics that can solidly identify and distinguish different classes of objects in such low metallicity regimes. We use new photoionisation models to develop diagnostic diagrams involving various nebular lines. We show that combinations of these diagrams allow the identification and discrimination of the following classes of objects in the early universe: PopIII and Direct Collapse Black Holes (DCBH) in pristine environments, PopIII and DCBH embedded in slightly enriched ISM (Z~10^{-5}-10^{-4}), (metal poor) PopII and AGN in enriched ISM. Diagnostics involving rest-frame optical lines (that will be accessible by JWST) have a better discriminatory power, but also rest-frame UV diagnostics can provide very useful information. Interestingly, we find that metal lines such as [OIII] 5007A and CIV 1549A can remain relatively strong (about a factor of 0.1-1 relative H-beta and HeII 1640A, respectively), even in extremely metal poor environments (Z~10^{-5}-10^{-4}), which could be embedding PopIII galaxies and DCBH.
