海鸥星云
(原标题: The Seagull Nebula)
2025-06-26
浏览次数: 21
在地球上的天文学家看来，这片由发光气体和模糊尘埃组成的星际广阔区域呈现出一幅像鸟一样的景象，这正是它的流行绰号“海鸥星云”的由来。这张宇宙鸟的宽频图像覆盖了银河系平面上3.5度宽的狭长地带，位于大犬座的阿尔法星天狼星的方向。海鸥星云明亮的头部被编录为IC 2177，这是一个致密的、布满尘埃的发射和反射星云，内有大质量恒星HD 53367。较大的发射区域，包括其他星表名称的天体，很可能是被连续的超新星爆炸扫过的广泛壳结构的一部分。图中右下方的蓝色弧线是逃逸恒星大犬FN的弓形激波。在海鸥星云3800光年的距离上，这个由大犬座OB1的其他恒星组成的星际气体和尘埃云的复调被氢原子发出的红色光芒所主导，跨度超过200光年。
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An interstellar expanse of glowing gas and obscuring dust presents a bird-like visage to astronomers from planet Earth, suggesting its popular moniker, the Seagull Nebula. This broadband portrait of the cosmic bird covers a 3.5-degree wide swath across the plane of the Milky Way, in the direction of Sirius, alpha star of the constellation of the Big Dog (Canis Major). The bright head of the Seagull Nebula is cataloged as IC 2177, a compact, dusty emission and reflection nebula with embedded massive star HD 53367. The larger emission region, encompassing objects with other catalog designations, is Likely part of an extensive shell structure swept up by successive supernova explosions. The notable bluish arc below and right of center is a bow shock from runaway star FN Canis Majoris. Dominated by the reddish glow of atomic hydrogen, this complex of interstellar gas and dust clouds with other stars of the Canis Majoris OB1 association spans over 200 light-years at the Seagull Nebula's estimated 3,800 light-year distance.
© Timothy Martin