星系中的常见发射线
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- [OII] doublet (3737A)
- [OIII] (4959A and 5007A)
- Balmer series (6563A, 4861A, 4340A, 4103A, ...).
- [NII]6583A
- [CII] 158$\mu$m fine-structure line
- trace regions of active star formation and is the main coolant of the cold, neutral atomic medium.[1]