$\textit{Nāpōwawā`enakaulua}$:Aether巡天中宇宙黎明时期的一对紧密类星体
$\textit{Nāpōwawā`enakaulua}$: a close quasar pair at cosmic dawn in the Aether survey
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- International Gemini Observatory, NSF NOIRLab(国际双子座天文台,美国国家光学红外天文实验室)
- INAF – Osservatorio di Astrofisica e Scienza dello Spazio di Bologna(意大利国家天体物理研究所博洛尼亚天文与空间科学观测站)
- Institute for Theoretical Physics, Heidelberg University(海德堡大学理论物理研究所)
- Center for Astrophysics — Harvard & Smithsonian(哈佛-史密森尼天体物理中心)
- UCO/Lick Observatory, Department of Astronomy & Astrophysics, UC Santa Cruz(加州大学圣克鲁兹分校卢瑟福天文台)
- Max Planck Institut für Astrophysik(马克斯·普朗克天体物理研究所)
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中文总结 AI 辅助
发现并表征了宇宙黎明时期最紧凑的类星体对Nāpōwawā`enakaulua,其出现几率远超预期,暗示合并触发或高密度环境,为研究早期星系和黑洞质量聚集提供关键线索。
中文摘要 AI 辅助
我们报告了$\textit{Nāpōwawā`enakaulua}$的发现与首次表征:这是再电离纪元中已知最紧凑的类星体对候选体,其投影间距仅为$0.98^{\prime\prime}$(在$z \sim 6.08$处约合$5.56$ pkpc),速度偏移为$\Delta v \simeq 15 \text{ km s}^{-1}$。利用JWST/NIRSpec IFU(作为$\textit{Aether巡天}$的一部分)、Gemini/GNIRS和GMOS的光谱数据,我们表征了这两个类星体的连续谱和发射线性质,从而约束了它们的黑洞质量($M_{\text{BH}} \simeq 1.5 \times 10^9$和$4.0 \times 10^8\\,M_\odot$)、吸积状态($\lambda_{\text{Edd}} \simeq 1.23$和$1.07$)以及系统红移($z_{\rm sys} \simeq 6.0781$和$6.0785$)。我们通过将这对类星体的出现几率与高红移类星体在大尺度上的成团测量外推进行比较,将其置于宇宙学背景中,结果发现其出现几率比预期高出约2-3个数量级。这一超出暗示在宇宙黎明时期存在潜在的合并触发的类星体对群体,或存在密度高于平均的星系环境。因此,$\textit{Nāpōwawā`enakaulua}$是研究首批大质量星系和黑洞质量聚集的关键标志。
英文摘要
We present the discovery and first characterization of $\textit{Nāpōwawā`enakaulua}$: the most compact known quasar pair candidate in the Epoch of Reionization, with a projected separation of only $0.98^{\prime\prime}$ ($\approx 5.56$ pkpc at $z \sim 6.08$) and a velocity offset of $Δv \simeq 15 \text{ km s}^{-1}$. Using spectroscopy from JWST/NIRSpec IFU, as part of the $\textit{Aether survey}$, Gemini/GNIRS and GMOS we characterize the continuum and emission line properties of the two quasars, enabling constraints on their black hole masses ($M_{\text{BH}} \simeq 1.5 \times 10^9$ and $4.0 \times 10^8\,M_\odot$), accretion states ($λ_{\text{Edd}} \simeq 1.23$ and $1.07$), and systemic redshifts ($z_{\rm sys} \simeq 6.0781$ and $6.0785$). We place this pair in the cosmological context by comparing the chance of occurrence to extrapolations of high-$z$ quasar clustering measurements at larger scales, resulting in a $\sim 2-3$ order of magnitude excess with respect to expectations. This excess hints at an underlying population of merger-triggered quasar pairs at cosmic dawn or to a denser-than-average galactic environment. $\textit{Nāpōwawā`enakaulua}$ thus represents a crucial signpost to investigate the mass assembly of the first massive galaxies and black holes.