2025年7月16日
The Rosette Nebula from DECam
Image Credit: CTIO, NOIRLab, DOE, NSF, AURA; Processing: T. A. Rector (U. Alaska Anchorage), D. de Martin (NSF’s NOIRLab) & M. Zamani
Explanation: Would the Rosette Nebula by any other name look as sweet? The bland New General Catalog designation of NGC 2237 doesn’t appear to diminish the appearance of this flowery emission nebula, as captured by the Dark Energy Camera (DECam) on the Blanco 4-meter telescope at the NSF‘s Cerro Tololo Inter-American Observatory in Chile. Inside the nebula lies an open cluster of bright young stars designated NGC 2244. These stars formed about four million years ago from the nebular material and their stellar winds are clearing a hole in the nebula’s center, insulated by a layer of dust and hot gas. Ultraviolet light from the hot cluster stars causes the surrounding nebula to glow. The Rosette Nebula spans about 100 light-years across, lies about 5000 light-years away, and can be seen with a small telescope towards the constellation of the Unicorn (Monoceros).
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Tomorrow’s picture: 3I
暗能量相机看玫瑰星云
影像提供: CTIO, NOIRLab, DOE, NSF, AURA; 影像处理: T. A. Rector (U. Alaska Anchorage), D. de Martin (NSF’s NOIRLab) & M. Zamani
说明: 如果改以其他名字称呼玫瑰星云，它是否依然美丽？在这幅由位于智利的美国科学基金会 托洛洛山美洲天文台的4米口径布兰科望远镜，搭载的暗能量相机（DECam）所拍摄的影像里，于新总星表（NGC）里拥有平凡无奇编录号NGC 2237的这团花朵状发射星云，其迷人的风采丝毫不减。这团星云的中心，有个名为NGC 2244、由明亮年轻恒星聚成的疏散星团。这些大约在4百万年前，由星云物质凝聚形成的年轻恒星，所发出的强烈恒星风，在星云的中心清出一个空穴，边缘则镶着层状的炽热气体与尘埃。此外，来自这些高温星团恒星的紫外光辐射，更激发周围的云气发出辉光。位于麒麟 座方向、距离我们约5,000光年远、宽约100光年的玫瑰星云，用小望远镜即可见。
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明日的图片: 3I
