PISN-explorer：寻找超大质量第一颗恒星的后代
PISN-explorer: hunting the descendants of very massive first stars
摘要：
超大质量的第一颗恒星（$m>100\rm M_{\odot}$）是再电离、金属富集和超大质量黑洞形成的早期阶段的基础。其中，那些与$140\leq\rm m/\rm M_{\odot}\leq260$预计演变为对不稳定超新星（PISN）留下一个独特的化学签名，在其化学产额。尽管如此，尽管进行了长期的搜索，PISN的恒星后代仍然难以捉摸。在这里，我们提出了一种新的方法，PISN探测器，以确定候选人的恒星具有主导PISN富集。PISN-explorer基于物理驱动模型和FERRE代码的组合，并应用于大型光谱调查（APOGEE，GALAH，GES，MINCE和JINA数据库）的数据。我们研究了超过140万个对象，并建立了一个包含166个PISN后代候选者的目录。其中一个，2 M13593064 +3241036，在VLT用UVES观察到，并得到完整的化学特征，包括杀伤元素Cu和Zn。我们发现，我们提出的方法是有效的选择PISN候选人从银河系和矮卫星星系，如六分仪或天龙座。进一步的高分辨率观测是非常必要的，以确认我们最好的候选者，因此使我们能够探测非常大质量的第一颗恒星的存在和性质。
英文摘要：
The very massive first stars ($m>100\rm M_{\odot}$) were fundamental to the early phases of reionization, metal enrichment, and super-massive black hole formation. Among them, those with $140\leq\rm m/\rm M_{\odot}\leq260$ are predicted to evolve as Pair Instability Supernovae (PISN) leaving a unique chemical signature in their chemical yields. Still, despite long searches, the stellar descendants of PISN remain elusive. Here we propose a new methodology, the PISN-explorer, to identify candidates for stars with a dominant PISN enrichment. The PISN-explorer is based on a combination of physically driven models, and the FERRE code; and applied to data from large spectroscopic surveys (APOGEE, GALAH, GES, MINCE, and the JINA database). We looked into more than 1.4 million objects and built a catalogue with 166 candidates of PISN descendants. One of which, 2M13593064+3241036, was observed with UVES at VLT and full chemical signature was derived, including the killing elements, Cu and Zn. We find that our proposed methodology is efficient in selecting PISN candidates from both the Milky Way and dwarf satellite galaxies such as Sextans or Draco. Further high-resolution observations are highly required to confirm our best selected candidates, therefore allowing us to probe the existence and properties of the very massive First Stars.
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