圖片來源: Huang, Trung, Hasegawa et al.
The HCO+(3–2) line emission at 267 GHz observed with the SMA in the young planetary nebula NGC 7027 (Huang, Trung, Hasegawa et al. 2006, in preparation). The contours show H2 line emission excited by UV radiation (Cox ets al. 2002, A&A, 384, 603). The col
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