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Glossary term: 星系團

Description: 星系團是由具有引力束縛的星系組成的天體集合。星系團的大小和集中程度各不相同,包含的星系從數百個到數千個不等。例如,離我們最近的室女座星系團就是一個包含數千個星系的大型星系團。除了星系,星系團還包含等離子體和大量暗物質。

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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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一組鬆散分布的星系,其中包含許多偏黃色的橢圓星系,以及一個顯眼的螺旋星系。

天爐座星系團

Caption: 星系可以成群分布,例如我們所在的本星系群,或形成星系團。天爐座星系團是距離我們最近的大型星系團之一。由甚大望遠鏡巡天望遠鏡VST(位於智利的歐洲南方天文臺)拍攝的照片中,可見橢圓星系(無明顯結構,呈黃色調)以及螺旋星系,例如右下方的NGC 1365。這一星系因其突出的棒狀結構而被歸類為棒旋星系。天爐座星系團的中心是巨大的橢圓星系NGC 1399,它是照片左側最大的星系。
Credit: 歐洲南方天文臺。致謝:阿涅洛·格拉多和 盧卡·利馬托拉 credit link

License: CC-BY-4.0 Creative Commons 姓名標示 4.0 國際 (CC BY 4.0) icons


A large yellow oval galaxy sits in a field of many smaller galaxies. This large galaxy is brightest in its core

The giant elliptical galaxy ESO 325-G004

Caption: The giant elliptical galaxy ESO 325-G004 sits in the Abell S0740 galaxy cluster. This huge galaxy has a mass of approximately a hundred billion solar masses. ESO 325-G004 is brightest in its core with its brightness decreasing further from its center. This galaxy has no visible spiral structure or dust lanes. ESO 325-G004 and many of the smaller galaxies around it are members of the galaxy cluster Abell S0740.
Credit: Cropped from the original by NASA, ESA, and The Hubble Heritage Team (STScI/AURA); J. Blakeslee (Washington State University) credit link

License: PD Public Domain icons