2019 July 23

M82: Galaxy with a Supergalactic Wind
Image Credit:
NASA, ESA, Hubble; Processing & Copyright: Daniel Nobre

Explanation: Why is the Cigar Galaxy billowing red smoke? M82, as this starburst galaxy is also known, was stirred up by a recent pass near large spiral galaxy M81. This doesn’t fully explain the source of the red-glowing outwardly expanding gas and dust, however. Evidence indicates that this gas and dust is being driven out by the combined emerging particle winds of many stars, together creating a galactic superwind. The dust particles are thought to originate in M82’s interstellar medium and are actually similar in size to particles in cigar smoke. The featured photographic mosaic highlights a specific color of red light strongly emitted by ionized hydrogen gas, showing detailed filaments of this gas and dust. The filaments extend for over 10,000 light years. The 12-million light-year distant Cigar Galaxy is the brightest galaxy in the sky in infrared light, and can be seen in visible light with a small telescope towards the constellation of the Great Bear (Ursa Major).

M82:吹出超级星系风的星系
影像提供:
NASA, ESA, Hubble; 影像处理与版权: Daniel Nobre

说明: 为何雪茄星系会喷出泛红的烟雾?这个名为M82的星暴星系,最近受到通过附近的大螺旋星系M81附近之扰动。不过,这不足以完全解释这些向外扩张的泛红辉光气体之起源。证据显示这些气体,是受到许多恒星粒子风加总起来的星系超级风之驱策才泛流而出。这些尘埃颗粒起源于M82的星际物质,大小还真的和雪茄烟微粒相近。这张美丽的拼接主题影像,突显了电离氢气发出的特定波长红光,以呈现这些伸展长度超过10,000光年的气体和尘埃之精细丝状构造。距离超过1千2百万光年远的雪茄星系,是红外光波段天空最明亮的星系。透过光学小望远镜,就能在北天的大熊座方向见到它。

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