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1.Usually the Broad Absorption Lines (BAL) are detected only in high ionization ones, such as CIV, NV, SiIV and OVI, named high ionized BAL, but 10% of BAL QSOs show also low ionization lines, such as MgII, AlIII and even FeII.
一般来说，经常探测到的宽吸收线(BAL)为高电离线，如CIV，NV，SiIV和OIV，这些宽吸收线类星体(BAL QSOs)中有10％同时又存在低电离宽吸收线，如MgⅡ，AlⅢ，甚至FeⅡ。收藏指正
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