棒旋星系NGC 6217

2022年2月21日

Barred Spiral Galaxy NGC 6217
Image Credit: NASA, ESA, and the Hubble SM4 ERO Team

Explanation: Many spiral galaxies have bars across their centers. Even our own Milky Way Galaxy is thought to have a modest central bar. Prominently barred spiral galaxy NGC 6217, featured here, was captured in spectacular detail in this image taken by the Advanced Camera for Surveys on the orbiting Hubble Space Telescope in 2009. Visible are dark filamentary dust lanes, young clusters of bright blue stars, red emission nebulas of glowing hydrogen gas, a long bar of stars across the center, and a bright active nucleus that likely houses a supermassive black hole. Light takes about 60 million years to reach us from NGC 6217, which spans about 30,000 light years across and can be found toward the constellation of the Little Bear (Ursa Minor).

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Tomorrow’s picture: quasar illustrated

棒旋星系NGC 6217
影像提供: NASA, ESA, and the Hubble SM4 ERO Team

说明: 许多螺旋星系有棒状的核心，就连我们的银河系，咸认也有中等大小的核心棒。上面这幅呈现棒旋星系NGC 6217的超高解析主题影像，是在2009年由轨道上的哈勃太空望远镜先进巡天相机所拍摄。影像中，可见到丝缕状的黝黑尘埃带、泛蓝亮星所聚成的年轻星团、明亮氢气所组成的泛红发射星云、横过星系核心由恒星所构成的长棒结构、以及一个可能藏有超大质量黑洞的明亮活跃星系核。位小熊座方向的NGC 6217，大小约有30,000光年，所发出的光约要6千万年才能扺达我们这里。

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明日的图片: quasar illustrated