Galactic nucleus - gingachūshinkaku
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A dense region at the center of a galaxy with a diameter of less than a few hundred light years. Most galaxies with an absolute magnitude brighter than about -15 have a central nucleus, and if the galaxy is relatively close, it can be seen as a star-like bright spot in a photograph. In the case of large galaxies, the central nucleus shows some activity, and those with particularly strong activity are called active galactic nuclei. Source : Heibonsha Encyclopedia About MyPedia Information |
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銀河の中心部の高密度領域で，直径が数百光年以下のもの。絶対等級がほぼ−15等よりも明るい銀河のほとんどが中心核をもち，比較的近距離にある銀河なら，写真上で恒星状の輝点として認められる。大きな銀河の場合その中心核は何らかの活動性を示すが，それが特に強いものを活動銀河核と呼んでいる。
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