171229期:大视野镜中的M78

171229期:大视野镜中的M78

在丰饶的猎户座中,遍布着辉光星云星际尘埃云。这幅绚丽多彩、视野广阔的影像里,涵盖了猎户腰带以北的整个天区。其中,M78是最明亮者之一,它是这幅影像的中心天体。这团蓝色反射星云离我们大约有1500光年的距离,其大小约5光年。它美丽的色泽是由于尘埃优先反射附近炽热年轻的恒星的蓝光所产生的。在M78左侧的反射星云是NGC2071,而右侧的这个看上去娇小的天体则是迷人的McNeil星云,这是最近才发现的变光星云,它与一颗最新形成的类太阳恒星有关。恒星形成过程中所发出的高能喷流——赫比格-哈罗天体,其发射出暗红的亮斑,在黝黑的尘埃带中明晰可辨。这张长曝光影像也记录了此区域中较为昏暗但无所不在的氢原子辉光。

译:银河说翻译组 潘Hellen

M78 Wide Field
Image Credit &Copyright: Fabian Neyer

Explanation: Interstellar dust clouds and glowing nebulae abound in the fertile constellation of Orion. One of the brightest, M78, is centered in this colorful,wide field view, covering an area north of Orion’s belt. At a distance of about 1,500 light-years, the bluish reflection nebula is around 5 light-years across. Its tint is due to dust preferentially reflecting the blue light of hot, young stars. Reflection nebula NGC 2071 is just to the left of M78. To the right, and much more compact in appearance, the intriguing McNeil’s Nebula is a recently recognized variable nebula associated with a young sun-like star. Deeper red flecks of emission from Herbig-Haro objects, energetic jets from stars in the process of formation, stand out against the dark dust lanes. The exposure also brings out the region’s fainter pervasive glow of atomic hydrogen gas.

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