NGC 1579:北方三叶星云

来源:APOD

Colorful NGC 1579 resembles the better known Trifid Nebula, but lies much farther north in planet Earth's sky, in the heroic constellation Perseus. About 2,100 light-years away and 3 light-years across, NGC 1579 is, like the Trifid, a study in contrasting blue and red colors, with dark dust lanes prominent in the nebula's central regions. In both regions, dust reflects starlight to produce beautiful blue reflection nebulae. But unlike the Trifid, in NGC 1579 the reddish glow is not emission from clouds of glowing hydrogen gas excited by ultraviolet light from a nearby hot star. Instead, the dust in NGC 1579 drastically diminishes, reddens, and scatters the light from an embedded, extremely young, massive star, itself is strong emitter of the characteristic red hydrogen alpha light.

够漂亮~~~~~~~~

顶!!!!!!!!!!!!!

这张图不错！！

美丽的NGC 1579星云外观类似著名的三叶星云M20（NGC 6514），但它远在北天的英仙座内，离我们2000光年，跨度大约3光年。NGC 1579像三叶星云一样，中心横亘着尘埃带，把星云分隔为对比强烈的蓝、红区域。在所有区域，蓝色是星云尘埃反射星光所致。但与三叶星云中的红光是星云被（大质量恒星）紫外线激发产生H发射谱线不同，NGC 1579的红光是尘埃散射了星云内部一颗超大质量恒星的星光所致。这颗恒星的H-alpha发射线非常强，足够透过尘埃被我们看见（就像我们看见朝霞是红的一样——译者注）。

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