BzK星系是筛选出的恒星形成星系,或在天文物理学基于光度学,被动的经由B、z和K光度频带筛选出的星系。
依据最初的定义,选择的标准[1]如下:
- 恒星形成BzK (sBzK)星系满足:
- 被动BzK (pBzK) 星系满足: and
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