活跃星系半人马座A的X射线喷流
[align=center][color=red][b]影像提供:[/b] R.Kraft ( [/color][color=red]SAO[/color][color=red]) et al., [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.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=ALkJrhjTC_Oa-D9qEicLbtMHGm1qYWgzNg][color=red]CXO[/color][/url][color=red] , [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.nasa.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=ALkJrhj_xlqOJA-k78QP_ky3FPssLJYzsQ][color=red]NASA[/color][/url] [/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0108/cena_cxo_big.jpg[/img]
[color=green][b]说明:[/b]受到厚厚尘埃带的遮掩，巨大椭圆星系[/color][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=ALkJrhi2yJxAxSYRtNEIshwKQ_wTCZN8ig][color=green]半人马座A (Centaurus A)[/color][/url][color=green]的核心，在可见光波段通常是[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap981204.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=ALkJrhg9MwoZhvZasqNJLeH4SGe0hcTPjQ][color=green]隐而不显[/color][/url][color=green] 。 [align=left]因此，当[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.edu/chronicle/0301/two_years.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=ALkJrhhWMKlo3UCMrkZylpAGqn4GIqbHng]钱卓拉X射线观测站[/url]发射升空运转后，半人马座A是它的第一批观测目标。 [/align][align=left]天文学家的好奇心也得到相当的回报，因为半人马座A在X射线波段的外观，显示它是一个不折不扣的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://imagine.gsfc.nasa.gov/docs/science/know_l1/active_galaxies.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=ALkJrhjsS6W0dRMGU6dLxYr46Lua5ggIgA]活跃星系[/url] 。 [/align][align=left]在上面这张钱卓拉观测站所拍摄的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.edu/photo/cycle1/0157blue/index.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=ALkJrhjtZ5DFV3g9mzkOIY53MrGfIinxLw]X射线假色影像[/url]里，最突出的特点是向影像左上方延伸的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap991028.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=ALkJrhj-byjyD1GlCQTQNWhRnMKF87aGCw]喷流[/url] ，它源自半人马座A的核心，而长度足足有三万光年长！ [/align][align=left]根据这种特征，天文学家怀疑这个星系的核心，可能藏着一颗100万倍大阳质量的黑洞。 [/align][align=left]除了喷流之外， [url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://xxx.lanl.gov/abs/astro-ph/0105482&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=ALkJrhh6sOHRBRaDcsQat8bPmF04vubKxw]半人马座A[/url]还拥有许多X射线辐射源，以及一个弥漫的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://imagine.gsfc.nasa.gov/docs/science/know_l2/history_xray.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=ALkJrhgQiU6iBdSRrvgi1RbI_Dvt6fNS6Q]X射线[/url]辉光。 [/align][align=left]这些X射线源可能大部份是中子星或者是质量和太阳差不多的黑洞，它们周围的拱星盘中有大量吸自[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap010524.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=ALkJrhhYG9MpHs7_4ipeWiQcoMJl9R7OXw]伴星[/url]的物质，拱星盘物质相互摩擦产生高热，并辐射出X射线。 [/align][align=left]弥漫的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap010814.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=ALkJrhiYIbTlQmOVCPYGOuYHyE7GYWFXuA]高能辉光[/url] ，代表这个星系充满着最加热到数百万[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://lamar.colostate.edu/~hillger/temps.htm&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=ALkJrhjmg6iDulxEgHzu00NEApZGcI1S2g]度[/url]高温的云气。 [/align][align=left]别名为NGC 5128的半人马座A很自然的是位在[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.edu/photo/0157/seeit.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=ALkJrhiXVc_W3R5sm8xv_zx_I_TI0dTEVg]半人马座(Centaurus)[/url]内，距离我们约有一千一百万光年，它是离我们最近的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.edu/photo/0157/0157_context.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=ALkJrhg2LbVRXQXp-xEhKZBYvstw4EmDxQ]活跃星系[/url] 。[/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 10:42 编辑 [/i]] 您辛苦了，发这么多好帖！！感谢！！
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