仙王座的ngc7822
(原标题: NGC 7822 in Cepheus)
2022-01-20
浏览次数: 14
炙热的年轻恒星和由气体和尘埃组成的宇宙柱似乎聚集在NGC 7822中。在靠近北方仙王座的一个巨大分子云的边缘，这个发光的恒星形成区距离我们大约3000光年。在星云内部，明亮的边缘和黑暗的形状在这张彩色望远镜拍摄的天空景观中非常突出。该图像包括窄带滤光片的数据，将原子氧、氢和硫的发射映射为蓝色、绿色和红色。发射线和颜色的组合已经成为众所周知的哈勃调色板。原子发射是由中心热恒星的高能辐射提供动力的。它们强大的风和辐射塑造并侵蚀了密度更大的柱状结构，并在星云中心形成了一个横跨数光年的特征空洞。恒星仍可能在引力坍缩的作用下在柱体内部形成，但随着柱体被侵蚀，任何正在形成的恒星最终都将与恒星物质的储存库隔绝。在NGC 7822的估计距离上，这张视场的跨度约为40光年。
查看原文解释
Hot, young stars and cosmic pillars of gas and dust seem to crowd into NGC 7822. At the edge of a giant molecular cloud toward the northern constellation Cepheus, the glowing star forming region lies about 3,000 light-years away. Within the nebula, bright edges and dark shapes stand out in this colorful telescopic skyscape. The image includes data from narrowband filters, mapping emission from atomic oxygen, hydrogen, and sulfur into blue, green, and red hues. The emission line and color combination has become well-known as the Hubble palette. The atomic emission is powered by energetic radiation from the central hot stars. Their powerful winds and radiation sculpt and erode the denser pillar shapes and clear out a characteristic cavity light-years across the center of the natal cloud. Stars could still be forming inside the pillars by gravitational collapse but as the pillars are eroded away, any forming stars will ultimately be cutoff from their reservoir of star stuff. This field of view spans about 40 light-years at the estimated distance of NGC 7822.
© Mark Carter