舞动的幽灵：来自活动星系的弯曲喷流
(原标题: Dancing Ghosts: Curved Jets from Active Galaxies)
2021-09-01
浏览次数: 37
为什么星系会发出像幽灵一样的喷流呢？此外，为什么它们看起来像是在跳舞？来自两个宿主星系中心的超大质量黑洞（中上和左下）的卷曲蓬松的喷流不同于以往的任何东西。它们是由天文学家在绘制追踪星系演化的地图时使用澳大利亚平方公里阵列探路者（ASKAP）射电望远镜发现的。在宇宙演化图调查之前的图像只显示了无定形的斑点。最终，对发射能量的相对量的比较表明，发光的细长结构是由围绕磁力线流动的电子产生的。将射电数据叠加在天空的光学视图（暗能量调查）上，证实了电子流起源于活跃星系的中心。通常这样的活动星系核（AGN）会产生直喷流。对于这些异常优美的形状的几何起源，一个主要的假设涉及到大规模星系间风的流动。天体物理学家：在天体物理学源代码库中浏览2500多个代码
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Why would galaxies emit jets that look like ghosts? And furthermore, why do they appear to be dancing? The curled and fluffy jets from the supermassive black holes at the centers of two host galaxies (top center and lower left) are unlike anything seen before. They were found by astronomers using the Australian Square Kilometer Array Pathfinder (ASKAP) radio telescope when creating maps tracing the evolution of galaxies. Images preceding this Evolutionary Map of the Universe survey only showed amorphous blobs. Eventually, comparisons of relative amounts of energy emitted revealed the glowing elongated structures were created by electrons streaming around magnetic field lines. Overlaying the radio data on an optical view of the sky (Dark Energy Survey) confirmed that the electron streams originated from the centers of active galaxies. Usually such Active Galactic Nuclei (AGN) produce straight jets. A leading hypothesis for the geometric origin of these unusually graceful shapes involves the flow of large-scale intergalactic winds. Astrophysicists: Browse 2,500+ codes in the Astrophysics Source Code Library