SOFIA CII and NII obs. of M101 and NGC6946
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The [CII] fine-structure transition at 158{mu}m is frequently the brightest far-infrared line in galaxies. Due to its low ionization potential, C+ can trace the ionized, atomic,...
158微米（μm）处的碳[II]（[CII]）精细结构跃迁，通常是星系中最为明亮的远红外谱线。由于其较低的电离势（ionization potential），碳正离子（C+）能够示踪电离的原子态……
