论文标题
发现至少5 MPC的射电星系
The discovery of a radio galaxy of at least 5 Mpc
论文作者
论文摘要
我们发现了投影最大的银河系结构中的内容：一个巨大的射电星系，其预计的$ 4.99 \ pm 0.04 \ \ \ \ m rakrm {mpc} $。该源名为Alcyoneus，最初是在低分辨率Lofar两米的Sky Survey图像中鉴定出来的，从中取出了角度紧凑的来源。作为同类的极端例子，Alcyoneus可以阐明驱动射电星系生长的主要机制。我们发现 - 除了几何形状 - Alcyoneus及其宿主星系似乎是普通的：总低频光度密度，恒星质量和超质量黑洞质量都低于中间巨型宽度银河系（百分比$ 45 \ pm 3 \％3 \％$ 25 \％$，$ 25 \ pm 9 \％\％$ $ 11 \ pm $ $ $ 11 \ $ $ 11 \ $ $ 11 \ pm $ $ n类相似。来源驻留在宇宙网的细丝中，它可能与之具有显着的热力学相互作用。以$ 5 \ cdot 10^{ - 16} \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \。
We discover what is in projection the largest known structure of galactic origin: a giant radio galaxy with a projected proper length of $4.99 \pm 0.04\ \mathrm{Mpc}$. The source, named Alcyoneus, was first identified in low-resolution LOFAR Two-metre Sky Survey images from which angularly compact sources had been removed. Being an extreme example in its class, Alcyoneus could shed light on the main mechanisms that drive radio galaxy growth. We find that - beyond geometry - Alcyoneus and its host galaxy appear suspiciously ordinary: the total low-frequency luminosity density, stellar mass and supermassive black hole mass are all lower than, though similar to, those of the medial giant radio galaxy (percentiles $45 \pm 3\%$, $25 \pm 9 \%$ and $23 \pm 11 \%$, respectively). The source resides in a filament of the Cosmic Web, with which it might have significant thermodynamic interaction. At $5 \cdot 10^{-16}\ \mathrm{Pa}$, the pressures in the lobes are the lowest hitherto found, and Alcyoneus therefore represents one of the most promising radio galaxies yet to probe the warm-hot intergalactic medium.
