仙后座上的幽灵
(原标题: Phantoms in Cassiopeia)
2024-10-26
浏览次数: 17
这些轮廓明亮的流动形状在宇宙尺度上看起来像幽灵。这是仙后座的望远镜照片，色彩斑斓的天空呈现出彗星形状的云ic59（左）和ic63。大约600光年远，这些云实际上并不是鬼。然而，在炽热明亮的伽马星的高能辐射的影响下，它们正在慢慢消失。伽马Cas的物理位置距离星云只有3到4光年，位于画面右边缘的上方。IC 63稍微接近伽马Cas，主要是由炽热恒星的紫外线辐射电离的氢原子与电子重新结合时发出的红色h - α光。距离恒星较远的IC 59显示出较少的h - α辐射，但更多的是尘埃反射恒星光的蓝色特征。在星际幻影的估计距离上，视野跨度超过1度或10光年。
查看原文解释
These brightly outlined flowing shapes look ghostly on a cosmic scale. A telescopic view toward the constellation Cassiopeia, the colorful skyscape features the swept-back, comet-shaped clouds IC 59 (left) and IC 63. About 600 light-years distant, the clouds aren't actually ghosts. They are slowly disappearing though, under the influence of energetic radiation from hot, luminous star gamma Cas. Gamma Cas is physically located only 3 to 4 light-years from the nebulae and lies just above the right edge of the frame. Slightly closer to gamma Cas, IC 63 is dominated by red H-alpha light emitted as hydrogen atoms ionized by the hot star's ultraviolet radiation recombine with electrons. Farther from the star, IC 59 shows less H-alpha emission but more of the characteristic blue tint of dust reflected star light. The field of view spans over 1 degree or 10 light-years at the estimated distance of the interstellar apparitions.
© Christophe Vergnes