当玫瑰不红时
(原标题: When Roses Aren't Red)
2024-02-09
浏览次数: 14
当然，并非所有的玫瑰都是红色的，但它们仍然非常漂亮。同样，美丽的玫瑰星云和其他恒星形成区域在天文图像中经常以红色为主色调显示，部分原因是星云中的主要发射物是氢原子。氢最强的光发射线，被称为h - α，位于光谱的红色区域。但发射星云的美丽并不仅仅需要在红光中欣赏。星云中的其他原子也被高能星光激发，并产生狭窄的发射线。在这张玫瑰星云的特写照片中，窄带图像被映射成宽频带颜色，以显示硫原子的红色、氢原子的绿色和氧原子的蓝色。事实上，将这些狭窄的原子发射线（SHO）映射成更宽的颜色（RGB）的方案在许多发射星云的哈勃图像中被采用。这张照片横跨玫瑰星云中心约50光年。这个星云位于大约3000光年外的麒麟座。
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Not all roses are red of course, but they can still be very pretty. Likewise, the beautiful Rosette Nebula and other star forming regions are often shown in astronomical images with a predominately red hue, in part because the dominant emission in the nebula is from hydrogen atoms. Hydrogen's strongest optical emission line, known as H-alpha, is in the red region of the spectrum. But the beauty of an emission nebula need not be appreciated in red light alone. Other atoms in the nebula are also excited by energetic starlight and produce narrow emission lines as well. In this close-up view of the Rosette Nebula, narrowband images are mapped into broadband colors to show emission from Sulfur atoms in red, Hydrogen in green, and Oxygen in blue. In fact, the scheme of mapping these narrow atomic emission lines (SHO) into the broader colors (RGB) is adopted in many Hubble images of emission nebulae. This image spans about 50 light-years across the center of the Rosette Nebula. The nebula lies some 3,000 light-years away in the constellation Monoceros.
© Tommy Lease