Glossary term: 活動星系核
Description: 活動星系核（AGN）是位於星系中心的一個非常明亮的區域。人們認為它是由一個超大質量黑洞驅動的，黑洞吸積周圍的物質，在其周圍形成一個極熱的吸積盤。AGN具有相當復雜的結構，有許多不同的區域發出不同特性的光，並且通常被甜甜圈狀的環形塵埃包圍。AGN有時會向相反的方向噴射物質。雖然許多星系的中心都有一個超大質量黑洞，但並非所有黑洞都在吸積物質，因此也並非所有星系中心都是AGN。
AGN是一個統稱，包括類星體、耀變體、賽弗特星系和射電星系。人們認為這些天體的不同觀測特性部分是由於從不同角度觀察AGNs造成的。
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Term and definition status: The original definition of this term in English have been approved by a research astronomer and a teacher The translation of this term and its definition is still awaiting approval
This is an automated transliteration of the simplified Chinese translation of this term
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In Other Languages
- 阿拉伯語: النواة المجرية النشطة
- 孟加拉語: সক্রিয় ছায়াপথ কেন্দ্রীণ
- 德語: Aktiver Galaktischer Kern
- 英語: Active Galactic Nucleus
- 西班牙語: Núcleo Galáctico Activo
- 法語: Noyau actif de galaxie
- 印地語: सक्रिय गैलेक्टिक नाभिक (ऍक्टिव्ह गॅलेक्टिक न्युक्लीअस)
- 義大利語: Nucleo galattico attivo
- 日語: 活動銀河核 (external link)
- 韓語: 활동은하핵
- 馬拉提語: सक्रिय गॅलेक्टिक केंद्रक (ऍक्टिव्ह गॅलेक्टिक न्युक्लीअस)
- 簡體中文: 活动星系核
Related Media
Jet Ejected from the Active Galaxy M87
Caption: 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.
Credit: NASA, ESA, A. Lessing (Stanford University), E. Baltz (Stanford University), M. Shara (AMNH), J. DePasquale (STScI)
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License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
