We report the discovery and confirmation of a bright quasi-stellar object (QSO), 2MASS J13260399+7023462, at $z=2.889$. This QSO is the first spectroscopically confirmed candidate from an ongoing search using the combination of Gaia and WISE photometry to identify bright QSOs at $z>2$, the redshift regime for which the Lyman-$\alpha$ forest is accessible with ground-based facilities. With a Gaia apparent magnitude $G=16.07$, 2MASS J13260399+7023462 is one of the brightest QSOs known at $z>2$, with only 15 currently known brighter QSOs. Given its inferred $M_{1450,AB}$ magnitude and redshift, it is among the most luminous objects in the Universe; the inferred black hole mass and corresponding Eddington ratio are ($2.7 \pm 0.4$) $\times$ 10$^{10}$ M$_{\odot}$ and $1.3 \pm 0.3$, respectively. Follow-up Hubble observations confirm it is not gravitationally lensed.

中文翻译：

---

z = 2.89 处的极其明亮的 QSO

我们报告发现并确认了一个明亮的准恒星物体 (QSO)，2MASS J13260399+7023462，$z=2.889$。该 QSO 是第一个通过光谱学确认的候选者，该研究使用 Gaia 和 WISE 光度测量法的组合来识别 $z>2$ 处的明亮 QSO，Lyman-$\alpha$ 森林可通过地面进入的红移区域设施。盖亚视星等 $G=16.07$，2MASS J13260399+7023462 是已知的最亮的 QSO 之一，$z>2$，目前已知的更亮的 QSO 仅有 15 个。鉴于其推断的 $M_{1450,AB}$ 星等和红移，它是宇宙中最明亮的天体之一；推断的黑洞质量和相应的爱丁顿比率分别为 ($2.7 \pm 0.4$) $\times$ 10$^{10}$ M$_{\odot}$ 和 $1.3 \pm 0.3$。