猎户座以南
(原标题: South of Orion)
2022-01-27
浏览次数: 15
明亮的蓝色反射星云NGC 1999位于猎户座星云的南部。在大约1500光年远的猎户座分子云复合体的边缘，NGC 1999的照明是由嵌入的变星猎户座V380提供的。在这张横跨两个满月的天空的望远镜远景图中，星云被标记为一个黑暗的侧边t形。它的黑暗形状曾经被认为是一个模糊的尘埃云的轮廓。但红外数据显示，这个形状很可能是由能量充沛的年轻恒星在星云本身吹出的一个洞。事实上，这个区域充满了充满活力的年轻恒星，它们会产生带有明亮冲击波的喷流和喷流。被编目为赫比格-哈罗（HH）天体，以天文学家乔治·赫比格和吉列尔莫·哈罗命名，具有强烈的红色色调。HH1和HH2就在NGC 1999的右下方。h222，也被称为瀑布星云，在画面右上方看起来像一个红色的裂缝。为了产生激波，恒星喷流以每秒数百公里的速度穿过周围的物质。
查看原文解释
South of the large star-forming region known as the Orion Nebula, lies bright blue reflection nebula NGC 1999. At the edge of the Orion molecular cloud complex some 1,500 light-years distant, NGC 1999's illumination is provided by the embedded variable star V380 Orionis. The nebula is marked with a dark sideways T-shape at center right in this telescopic vista that spans about two full moons on the sky. Its dark shape was once assumed to be an obscuring dust cloud seen in silhouette. But infrared data suggest the shape is likely a hole blown through the nebula itself by energetic young stars. In fact, this region abounds with energetic young stars producing jets and outflows with luminous shock waves. Cataloged as Herbig-Haro (HH) objects, named for astronomers George Herbig and Guillermo Haro, the shocks have intense reddish hues. HH1 and HH2 are just below and right of NGC 1999. HH222, also known as the Waterfall nebula, looks like a red gash near top right in the frame. To create the shocks stellar jets push through the surrounding material at speeds of hundreds of kilometers per second.
© Vikas Chander