仙女座星系周围的云
(原标题: Clouds Around Galaxy Andromeda)
2022-10-24
浏览次数: 28
仙女座星系周围的红云是什么？这个星系M31经常被地球上的天文学家拍摄。作为离我们最近的大型螺旋星系，它是一个熟悉的景象：黑暗的尘埃带，明亮的黄色核心，以及由明亮的蓝色恒星组成的云所描绘的旋臂。由曝光良好的宽频带和窄频带图像数据拼接而成，这幅我们邻近的宇宙岛的深度肖像提供了令人惊讶的不熟悉的特征，在同样广阔的视野中，微弱的红色发光电离氢气云。大多数电离的氢云肯定位于这幅景象的前景，远在我们的银河系内。它们很可能与散布在银河系平面上方数百光年处的无所不在的星际卷云有关。然而，其中一些云正好出现在仙女座星系本身，而另一些则出现在下方的小星系M110中。
查看原文解释
What are those red clouds surrounding the Andromeda galaxy? This galaxy, M31, is often imaged by planet Earth-based astronomers. As the nearest large spiral galaxy, it is a familiar sight with dark dust lanes, bright yellowish core, and spiral arms traced by clouds of bright blue stars. A mosaic of well-exposed broad and narrow-band image data, this deep portrait of our neighboring island universe offers strikingly unfamiliar features though, faint reddish clouds of glowing ionized hydrogen gas in the same wide field of view. Most of the ionized hydrogen clouds surely lie in the foreground of the scene, well within our Milky Way Galaxy. They are likely associated with the pervasive, dusty interstellar cirrus clouds scattered hundreds of light-years above our own galactic plane. Some of the clouds, however, occur right in the Andromeda galaxy itself, and some in M110, the small galaxy just below.
© Andrew Fryhover