M101:风车星系
[align=center][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.cfht.hawaii.edu/HawaiianStarlight/CFHT_WWW_Copyright.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=ALkJrhjjwdxJM_XDYJJBc5FmIYE8BODPPg][color=red][b]版权[/b][/color][/url][color=red][b]与影像提供:[/b] [/color][email=jcc@cfht.hawaii.edu][color=red]Jean-Charles Cuillandre[/color][/email][color=red] (CFHT), [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.cfht.hawaii.edu/HawaiianStarlight/English/What_Is_HawaiianStarlight.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=ALkJrhjLcHuJMiEPbjudcaaAohDq_8E7bA][color=red]Hawaiian Starlight[/color][/url][color=red] , [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.cfht.hawaii.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=ALkJrhgILNfRnGf7ViQy5uhBW3iu9cea3w][color=red]CFHT[/color][/url] [/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0303/m101_cfht_big.jpg[/img]
[color=green][b]说明:[/b]为何有这么多星系看起来像个[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/messier/spir.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=ALkJrhhGCok2VUh_iFQf1UGAI5112HUF1Q][color=green]涡漩[/color][/url][color=green] ？ [align=left][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.cfht.hawaii.edu/HawaiianStarlight/AIOM/English/CFHT-Coelum-AIOM-Mar2003.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=ALkJrhhxEhIDwvuby1nsopc9tcJOZRzJBw]上图所示[/url]的Ｍ101就是一个明显的例子。 [/align][align=left]与其他星系相较之下，它是属于比较近的一个星系，我们只有相距2200万光年，因此，让我们可以仔细地研究它。 [/align][align=left][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://adsabs.harvard.edu/cgi-bin/nph-bib_query%3Fbibcode%3D1997ApJ...481..169W&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=ALkJrhhmxUlITlZbSWWVcCeqnfEwoWs0kA]最近的证据显示[/url] ，它在与邻近星系的重力交互作用之后，产生了绕着星系中心的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://fuse.pha.jhu.edu/~danforth/spiral/&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=ALkJrhi9q2LahszkJztPv0P5wCNJeNLoWA]高质量波[/url]与压缩气体。 [/align][align=left][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://home.cc.umanitoba.ca/~ummccowa/density.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=ALkJrhikR1Oua871DUy81ouuf8TgsIQguw]这些高质量波[/url]压缩着已有的星际气体造成恒星的诞生。 [/align][align=left]在这个又称为[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/outreach/aop/observers/m101.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=ALkJrhhVy5oTPzNA4OZc-qQMIifSyO6GjQ]风车星系(Pinwheel Galaxy)[/url]的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/messier/m/m101.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=ALkJrhgePD_dTHwtGoPVJtJHqtyj2Hak7w]M101[/url]的旋臂上，存在有好几个非常[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap000610.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=ALkJrhimjjwsEEuHv46klGLEY3x2Qe2riA]明亮的恒星形成区域[/url] (称为[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://skyserver.fnal.gov/en/proj/challenges/hii/&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=ALkJrhhphDTgqoeu_VZMJ0EAux9fYiiV6Q]HII区域[/url] ) )。 [/align][align=left]由于[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.astr.ua.edu/gifimages/m101b.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=ALkJrhg-D_U2Tc95bgMYQs7vGvlvn2NdJA]M101[/url]相当的巨大，因此它的广大的重力也会使得邻近较小星系的变形。[/color]::42:: ::42:: ::42:: [size=2][color=magenta]（转自成大天文学教室）[/color][/size][/align] 2200万光年还近...?
不过这个星系确实很美...中间看起来就像是一个巨大的恒星(当然,我只是说好像) NGC7742更像。（图1）
M101（图2）
仙女座星系（图3）
M104（图4） [quote]原帖由 [i]幽哎浮欧[/i] 于 2008-8-19 09:20 发表 [url=http://www.astronomy.com.cn/bbs/redirect.php?goto=findpost&pid=998803&ptid=95607][img]http://www.astronomy.com.cn/bbs/images/common/back.gif[/img][/url]
2200万光年还近...?
不过这个星系确实很美...中间看起来就像是一个巨大的恒星(当然,我只是说好像) [/quote]
2200万光年在星系中算是近的了!!!::42:: ::42:: ::42::
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