子弹星系团内的物质
[align=center][color=red][b]影像提供:[/b] X射线: NASA/CXC/CfA/ [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://arxiv.org/abs/astro-ph/0511345&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhgBlJA4aNziQpVpzkleHRaoL6ZCqw][color=red]M.Markevitch[/color][/url][color=red] et al.;[/align][align=center][color=red]重力透镜: NASA/STScI; ESO WFI; Magellan/U.Arizona/ [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://arxiv.org/abs/astro-ph/0608407&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhgfYzw6vgDf0S1SqHzJDpdM1VTyow][color=red]D.Clowe et al[/color].[/url]
光学: NASA/STScI; Magellan/U.Arizona/D.Clowe et al.[/color][/align]
[align=center][color=red][/color][/align][align=center][color=blue][/color][/align][align=center][size=3][color=blue](2008年8月23日)[/color][/size] [/align]
[img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0808/bulletcluster_comp_f2048.jpg[/img]
[color=green][b]说明:[/b]星系团1E 0657-56常被[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://arxiv.org/abs/astro-ph/0511345&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhgBlJA4aNziQpVpzkleHRaoL6ZCqw][color=green]昵称[/color][/url][color=green]为"子弹星系团"，上面[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.edu/photo/2006/1e0657/&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhhl34aiGBkuaamSyphPJGJjF8HjWg][color=green]这幅组合影像[/color][/url][color=green]则呈现了它内部的[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.edu/photo/2006/1e0657/qa.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhiKJWlZVboTmoNZnLYhgA2nIzzgig][color=green]物质[/color][/url][color=green]分伂。 [align=left]子弹星系团离我们只有34亿光年远，因此在光学影像中，可清楚见到它个别的成员星系。 [/align][align=left]不过，这些星系的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap011024.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhh1Nyphzkhtx141NWYpV_X13MlPrQ]质量加总[/url]起来，还是远小于星系团炽热X射线辉光云气(红色)的质量。 [/align][align=left]影像中，蓝色的光晕为[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.edu/xray_sources/galaxy_clusters.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhiMYKPvhD6i3K-U-Wn3VUYWKcwRYw]星系团内暗物质[/url]之分布，而它的质量更是远高于星系和X射线云气的总和。 [/align][align=left]在这张望远镜影像中，通常不可见暗物质的分布之所以能被[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap030814.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhjdDKmiRONiPJGeq7efhwsKI8ggCw]描绘出来[/url] ，则来自观测背景星系星光在穿过此星系团时所受到的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap040627.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhhOL0hJvLBcKdzgNUvbIi10U4xgmQ]重力透镜[/url]效应。 [/align][align=left]X射线云气子弹形的右端，起源于两个[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.sdsc.edu/pub/envision/v15.2/ricker.html&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhi9OePiWV30IvPNwO_sRmV_w9e9VA]星系团之间[/url]的巨大碰撞，而这也是能放上教科书的震波前缘范例。 [/align][align=left]这里所显示的暗物质，除了在重力上会影响星系团之外，并不会有其他的交互作用。 [/color][/align][align=left][color=green]这种[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://en.wikipedia.org/wiki/Dark_matter&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhiZJseTYAKyLx8TQ3eiN7dfyatMtQ][color=green]暗物质[/color][/url][color=green]和辉光云气完全分离的例子，被视为是暗物质[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.engadget.com/2008/08/08/cern-rap-video-about-the-large-hadron-collider-creates-a-black-h/&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhg-xJv4qk9aWax9w-Xz5FDHI7fvkg][color=green]存在[/color][/url][color=green]的直接[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://arxiv.org/abs/astro-ph/0608407&prev=/search%3Fq%3Dnasa%25E6%25AF%258F%25E6%2597%25A5%25E4%25B8%2580%25E5%259B%25BE%26complete%3D1%26hl%3Dzh-CN%26newwindow%3D1%26sa%3DG&usg=ALkJrhgfYzw6vgDf0S1SqHzJDpdM1VTyow][color=green]证据[/color][/url][color=green] 。[/color] ::42:: ::42:: ::42:: [size=2][color=magenta](转自成大天文学教室)[/color][/size][/align]
[[i] 本帖最后由 zheng123 于 2008-8-23 16:05 编辑 [/i]] 暗物质啊，呵呵，图很漂亮！ 很神秘的说.....::070821_12.jpg::
个人觉得暗物质是除黑洞外第二神秘 这个图被多次引用过.
但是,还没有看明白.
星系团的质量,是通过可见光光度确定的吗?
X光的谱线如何?有特征谱吗?是展源?点源的复合?
巨大的星系团碰撞?好象有点夸张.速度差有测量吗?
没有看明白,学习中.
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