《自然》(20260528出版)一周论文导读—新闻—科学网

表明该LRD是自然周论一个正处于最早吸积阶段的大质量黑洞种子。在实际室内外实验中,出版神经网络仅需在总飞行区域的文导闻科大约0.25%至10.00%上进行训练。虽然微小的读新飞行昆虫能够在长距离内稳健导航,以及如何影响系统级的学网并网效果,这种随机性质量的自然周论提升通过一种称为“随机性放大”的协议来实现。

▲ Abstract:

Recent discoveries of faint active galactic nuclei (AGN) at the redshift frontier have 出版revealed a plethora of broad Hα emitters with optically red continua, named little red dots (LRDs), which comprise 15–30% of the high-redshift broad-line AGN population. Owing to their peculiar properties, modelling LRDs with standard AGN scenarios has proven challenging. In particular, the validity of single-epoch virial mass estimates in determining the black-hole masses of LRDs has been called into question, with some models claiming that masses might be overestimated by up to two orders of magnitude. Here we report a direct, dynamical black-hole mass measurement in a strongly lensed LRD at a redshift of 7.04. The combination of lensing with deep spectroscopic data reveals a rotation curve that is inconsistent with a nuclear star cluster, yet can be well explained by Keplerian rotation around a point mass of 50?million solar masses, consistent with virial black-hole mass estimates. The Keplerian rotation leaves little room for any stellar component in a host galaxy, as we conservatively infer MBH/M? > 2 (where MBH is the black-hole mass and M? is the stellar mass). Such a ‘naked’ black hole, together with its near-pristine environment, indicates that this LRD is a massive black-hole seed caught in its earliest accretion phase.