IRTF J-band spectrum of Mrk 231
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https://b2find.eudat.eu/dataset/3cc18284-b719-50a5-b28f-00c811e07447
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资源简介：
We present the first J-band spectrum of Mrk 231, which reveals a large He I {lambda}10830 broad absorption line with a profile similar to that of the well-known Na I broad...
