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。

Related Terms:

• Disk
• Galaxy
• Quasar
• Supermassive Black Hole
• Accretion Disk

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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