半人马座A年轻的蓝色恒星弧
[align=center][color=red][b]影像提供:[/b] E. Peng and H. Ford ( [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.pha.jhu.edu/&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=ALkJrhh26SB8REjSrI-fQ13MP0-JBaaBIA][color=red]JHU[/color][/url][color=red] ), K. Freeman ( [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.anu.edu.au/&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=ALkJrhgcg7mEKL9xP-zHWAsUYNdIigsiHQ][color=red]ANU[/color][/url][color=red] ), R. White ( [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.stsci.edu/&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=ALkJrhi4ltniJ-AplPP4jC4J3aFElIatfw][color=red]STScI[/color][/url][color=red] ), [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.ctio.noao.edu/&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=ALkJrhg0s61wiXDf2YUqwu_eCwv7KcQnUg][color=red]CTIO[/color][/url][color=red] , [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/&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=ALkJrhjn2rI6_iMnJgFxtTQX2Yk-WJCl_Q][color=red]NOAO[/color][/url][color=red] , [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.nsf.gov/&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=ALkJrhjgcV4_HYMUzoFshyN-yziGIH4mmw][color=red]NSF[/color][/url] [/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0210/cena_peng_big.jpg[/img]
[color=green][b]说明:[/b]在上面这张影像里，一道暗淡但[/color][url=http://203.208.39.99/image/0210/cena_peng_arrows.jpg][color=green]明确的蓝色弧[/color][/url][color=green] ，几乎淹没在由恒星、云气和尘埃所集结成的乱集团里。 [align=left]这道由年轻恒星所构成的弧线之所以会产生，可能是一个矮星系在靠近巨大椭圆星系[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://oposite.stsci.edu/pubinfo/pr/1998/14/astrofile.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=ALkJrhiJH_yrALWBXKtovQNfE0acJl6QZw]半人马座A (Centaurus A)[/url]的过程中，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/ap020502.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=ALkJrhgomZg9CA18byy5hQTzqZ5dU8S5OQ]扯碎[/url]时所触发的。 [/align][align=left]在这张经过[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/outreach/press/pr02/pr0211.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=ALkJrhhhve2DBgIy55gDKDXlgq87tRWBUQ]特殊处理的彩色数位影像[/url]里，这道长达2000光年的弧线位在右上角，而[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap020421.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=ALkJrhigTVWkzyZb5JqyeTX_d63kAX9lnA]半人马座A[/url]物质密集的中心区位在影像的下端。 [/align][align=left]组成这道蓝色弧线的星团，可能是沿着矮星系靠近时的轨迹分布，它们的年龄据估计只有2亿年到4亿年而已。 [/align][align=left]这项[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://xxx.lanl.gov/abs/astro-ph/0208422&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=ALkJrhjySCRTUrKUuZCmAB1j9a2zoKgKtw]令人惊奇的观测成果[/url]显示，天文学家可能目睹了一个正在进行的星系吞食现象。 [/align][align=left]这种星系吞食过程，公认是像我们[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap980826.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=ALkJrhiaa2iIFqAk-3S4xJzjFvcJCyxqlw]银河系[/url]这种大型星系形成与[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://gladstone.uoregon.edu/~cturner/p401/collisions.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=ALkJrhiEcIMEcfy0YCF22CIBJ2teOoVcbQ]演化[/url]的重要动力。 [/align][align=left]随着时间的逝去，这道弧线上的恒星和星团最终都会分散开来，被[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://sci.esa.int/content/news/index.cfm%3Faid%3D20%26cid%3D660%26oid%3D12503&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=ALkJrhh_s3_y4o6qyiE9a9PjQ10qK0Fk8Q]并入[/url]喧嚣混乱的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap020812.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=ALkJrhhSTFjByzuIQbOSCvr3T1K6kICn-g]半人马座A[/url]里。 [/align][align=left]这张影像是由位在智利Cerro Tololo之4米口径[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.ctio.noao.edu/new/Sky%2520Conditions/Webcam/&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=ALkJrhiYmPVs2zhMRGis8bk-Tz_P-Dg8kw]Blanco望远镜[/url]所拍摄的，这部望远镜是美洲天文台的众多设备之一。[/color] ::42:: ::42:: ::42:: [size=2][color=magenta](转自成大天文学教室)[/color][/size][/align]
页:
[1]