银河说-每日一图171201期：北美洲星云与鹈鹕星云

北美洲星云与鹈鹕星云

美丽地球的拥护者，大概不难认出这些宇宙星云的轮廓。图像左侧，在黑暗的宇宙背景衬托下，明亮的放射物质与边界模糊的尘埃带勾画出了一块大陆的形状，由此，这块分类为NGC 7000的放射区域获得了一个亲切的称呼——北美洲星云。图像右侧，也就是“北美洲”东岸附近，是IC 5070，它也因其独特的外形而被称为鹈鹕星云。这两片明亮的星云相隔约1500光年，同属于一个庞大的、几乎和猎户星座一样邻近的恒星形成的区复合体的一部分。这样的距离，在6度跨幅的广角影像中，宽度达150光年。这幅精细的宇宙图像，组合了数幅窄波段影像，以突显明亮的电离前沿和原子氢发出的泛红辐射。天幕幽暗时，用双筒望远镜向天鹅座天津四东北方向望去，即可观看到这些星座。

译：银河说翻译组 1949101

North America and the Pelican
Image Credit & Copyright: Paolo Moroni

Explanation: Fans of our fair planet might recognize the outlines of these cosmic clouds. On the left, bright emission outlined by dark, obscuring dust lanes seems to trace a continental shape, lending the popular name North America Nebula to the emission region cataloged as NGC 7000. To the right, just off the North America Nebula’s east coast, is IC 5070, whose profile suggests the Pelican Nebula. The two bright nebulae are about 1,500 light-years away, part of the same large and complex star forming region, almost as nearby as the better-known Orion Nebula. At that distance, the 6 degree wide field of view would span 150 light-years. This careful cosmic portrait uses narrow band images to highlight the bright ionization fronts and the characteristic red glow from atomic hydrogen gas. These nebulae can be seen with binoculars from a dark location. Look northeast of bright star Deneb in the constellation of Cygnus the Swan.

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