Glossary term: 吸積盤
Description: 當一個天體吸積物質時，除非下墜的物質已經徑直向吸引的天體運動，否則它不可能直接落到吸引的天體上。事實上，當下墜的物體靠近吸的引物體時，由於角動量守恆，其垂直於它與吸引物體之間連線的速度分量會增加。
在許多情況下，下墜的物會聚集成所謂的吸積盤：一個圍繞吸引天體氣體和塵埃的漩渦盤。物質會從吸積盤的內緣落到中心天體上。對於一個緻密的中心天體來說，落到吸積盤上的物質在下落過程中會獲得巨大的能量。當這些能量聚集在吸積盤中時，吸積盤的溫度會升高到數十萬甚至數百萬開爾文。一些星系中心超大質量黑洞周圍的吸積盤為活動星系核（AGN）提供了能量。這些極其明亮的天體可能比其宿主星系中所有恆星亮度的總和還要亮。
吸積盤存在於各種天體物理環境中，例如超大質量黑洞、恆星殘骸、伽馬射線暴或原恆星週圍。
Related Terms:
See this term in other languages
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
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.
Related Activities
Hunting for black holes
astroEDU educational activity (links to astroEDU website) Description: How do astronomers detect invisible black holes?License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons
Tags: Model , Experiment Age Ranges: 12-14 Education Level: Informal , Middle School Areas of Learning: Modelling , Observation based , Problem-solving , Social Research Costs: Low Cost Duration: 45 mins Group Size: Group Skills: Constructing explanations , Developing and using models
