2019年01月28日:螺旋星系D100的颀长气尾-(The Long Gas Tail of Spiral Galaxy D100)

2019年01月28日:螺旋星系D100的颀长气尾-(The Long Gas Tail of Spiral Galaxy D100)

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2019-01-28 / 0 评论 / 0 阅读 / 正在检测是否收录...

2019年01月28日:螺旋星系D100的颀长气尾-(The Long Gas Tail of Spiral Galaxy D100)
2019年01月28日:螺旋星系D100的颀长气尾-(The Long Gas Tail of Spiral Galaxy D100)--原图下载


Image Credit & Copyright: NASA, ESA, Hubble, Subaru Telescope, W. Cramer (Yale) et al., M. Yagi, J. DePasquale
说明: 为什么这个星系连着一根泛红的长尾?这根长尾的主要成分是在发出辉光的氢气,而且随着这个星系穿过星系团内的炽热气体,长尾也不停被剥除。更明确的说,这颗星系是螺旋星系D100,而星系团则是后发座星系团。而会有这道气体连到D100的中心,是因为受到重力束缚较弱的外围气体,已被冲压剥去。这道绵延200,000光年、质量高达400,000倍太阳质量的气尾,有恒星正形于其内。此外,位在D100左下方的星系D99,色泽之所以会偏红,是因为它赖以形成恒星的气体已被移除,无法再生成泛蓝的年轻恒星,只留下年老的恒星在散发泛红的辉光。这幅经过数位强化的假色主题影像,整合自轨道上的哈伯望远镜及地面昴宿望远镜的影像数据。研究这类特殊的天体系统,能提升我们对星系团内星系如何演化的了解。

原文:

Image Credit & Copyright: NASA, ESA, Hubble, Subaru Telescope, W. Cramer (Yale) et al., M. Yagi, J. DePasquale
Explanation: Why is there long red streak attached to this galaxy? The streak is made mostly of glowing hydrogen that has been systematically stripped away as the galaxy moved through the ambient hot gas in a cluster of galaxies. Specifically, the galaxy is spiral galaxy D100, and cluster is the Coma Cluster of galaxies. The red path connects to the center of D100 because the outer gas, gravitationally held less strongly, has already been stripped away by ram pressure.The extended gas tail is about 200,000 light-years long, contains about 400,000 times the mass of our Sun, and stars are forming within it. Galaxy D99, visible to D100's lower left, appears red because it glows primarily from the light of old red stars -- young blue stars can no longer form because D99 has been stripped of its star-forming gas.The featured false-color picture is a digitally enhanced composite of images from Earth-orbiting Hubble and the ground-based Subaru telescope.Studying remarkable systems like this bolsters our understanding of how galaxies evolve in clusters.

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