词条 活动星系核
描述: 活动星系核（AGN）是位于星系中心的一个非常明亮的区域。人们认为它是由一个超大质量黑洞驱动的，黑洞吸积周围的物质，在其周围形成一个极热的吸积盘。AGN具有相当复杂的结构，有许多不同的区域发出不同特性的光，并且通常被甜甜圈状的环形尘埃包围。AGN有时会向相反的方向喷射物质。虽然许多星系的中心都有一个超大质量黑洞，但并非所有黑洞都在吸积物质，因此也并非所有星系中心都是AGN。
AGN是一个统称，包括类星体、耀变体、赛弗特星系和射电星系。人们认为这些天体的不同观测特性部分是由于从不同角度观察AGNs造成的。
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词条和定义状态： 该术语的英文原始定义已通过天文研究人员和教师的审核 该术语及其定义的译文仍待审核
The OAE Multilingual Glossary is a project of the IAU Office of Astronomy for Education (OAE) in collaboration with the IAU Office of Astronomy Outreach (OAO). The terms and definitions were chosen, written and reviewed by a collective effort from the OAE, the OAE Centers and Nodes, the OAE National Astronomy Education Coordinators (NAECs) and other volunteers. You can find a full list of credits here. All glossary terms and their definitions are released under a Creative Commons CC BY-4.0 license and should be credited to "IAU OAE".
If you notice a factual or translation error in this glossary term or definition then please get in touch.
其他语言版本
- 阿拉伯语: النواة المجرية النشطة
- 孟加拉语: সক্রিয় ছায়াপথ কেন্দ্রীণ
- 德语: Aktiver Galaktischer Kern
- 英语: Active Galactic Nucleus
- 西班牙语: Núcleo Galáctico Activo
- 法语: Noyau actif de galaxie
- 北印度语: सक्रिय गैलेक्टिक नाभिक (ऍक्टिव्ह गॅलेक्टिक न्युक्लीअस)
- 意大利语: Nucleo galattico attivo
- 日语: 活動銀河核 (外部链接)
- 韩语: 활동은하핵
- 马拉地语: सक्रिय गॅलेक्टिक केंद्रक (ऍक्टिव्ह गॅलेक्टिक न्युक्लीअस)
- 繁体中文: 活動星系核
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Jet Ejected from the Active Galaxy M87
图注： A 3000-light-year-long jet streaming from the core of galaxy M87, as captured by the Hubble Space Telescope. The center of this image shows the core of the elliptical galaxy M87 (in the constellation Virgo) which hosts an active galactic nucleus (AGN).
An AGN is a very luminous region around a supermassive black hole. It is powered by matter falling towards the black hole and forming a hot accretion disk. Many galaxies host a supermassive black hole, but not all of them are accreting enough matter to appear as an AGN.
The strong gravity of the supermassive black hole in the heart of M87 has caused a huge jet of charges particles to be flung out from the accretion disk. This extends far out into the galaxy itself, beyond the core region. Here we see the jet as a whitish-blue line which gets wider the further it goes from the core. The light emission we see here is caused by the energetic electrons in the jet interacting with magnetic fields.
来源： NASA, ESA, A. Lessing (Stanford University), E. Baltz (Stanford University), M. Shara (AMNH), J. DePasquale (STScI)
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