Neutral hydrogen region
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Also known as an HI region. A region in the galaxy where neutral hydrogen exists. It fills almost the entire galaxy, but there are a few more on the outer edge along the spiral arms. If there is a hot, shining star in a neutral hydrogen region, the neutral hydrogen is ionized, and an ionized region is formed around the star. This is called a hydrogen ionized region or HII region, and is recognized as a diffuse emission nebula. Source : Heibonsha Encyclopedia About MyPedia Information |
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HI領域とも。銀河において中性水素の存在する領域。銀河系ではほとんどまんべんなく埋め尽くしているが，渦状腕に沿って外縁部にやや多く存在。中性水素領域の中に高温の輝く星があると，中性水素が電離されて，星の周囲には電離領域が形成される。これは電離水素領域またはHII領域と呼ばれ，いわゆる散光星雲として認められる。
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