NGC 6822: 巴纳德星系

2020年11月28日

NGC 6822: Barnard’s Galaxy
Image Credit & Copyright: Data – Martin Pugh, Processing – Mark Hanson

Explanation: Grand spiral galaxies often seem to get all the glory, flaunting their young, bright, blue star clusters in beautiful, symmetric spiral arms. But small galaxies form stars too, like nearby NGC 6822, also known as Barnard’s Galaxy. Beyond the rich starfields in the constellation Sagittarius, NGC 6822 is a mere 1.5 million light-years away, a member of our Local Group of galaxies. A dwarf irregular galaxy similar to the Small Magellanic Cloud, NGC 6822 is about 7,000 light-years across. Brighter foreground stars in our Milky Way have a spiky appearance. Behind them, Barnard’s Galaxy is seen to be filled with young blue stars and mottled with the telltale pinkish hydrogen glow of star forming regions in this deep color composite image.

Tomorrow’s picture: falling off a cliff

NGC 6822: 巴纳德星系
影像提供与版权: 数据提供 – Martin Pugh, 影像处理 – Mark Hanson

说明: 拥有美丽对称螺旋臂、上头镶着明亮年轻蓝色星团的宏伟螺旋星系，看似博所有的风采和目光。然而，像邻近名为巴纳德星系（NGC 6822）的这种小星系，也能形成恒星。位在人马座方向富星场后方，离我们约1百50万光年远的NGC 6822，是本星系群的成员之一。在这幅组合深空影像里，这个宽约7,000光年、酷似小麦哲伦星系的不规则矮星系，其内到处都是年轻的蓝色恒星，并缀着散发氢泛红辉光的恒星形成区。不过带星芒的天体，则是近在我们银河系之内的前景恒星。

明日的图片: falling off a cliff