本星系群内的星系NGC 6822
[align=center][b][color=red]影像[/color][/b][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/image_gallery/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=ALkJrhh9E1Ng0oNQsw3lD7LIVZpKGXdVRg][color=red][b]版权[/b][/color][/url][color=red][b]与提供:[/b] [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.lowell.edu/users/massey/lgsurvey.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=ALkJrhjMxDDqgA-pO8aRHWghf4fOIGvYMg][color=red]Local Group Galaxies Survey Team[/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=ALkJrhjh-1uaXzivFXqPf_bpg52mkCfAMg][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.aura-astronomy.org/&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=ALkJrhhkw3EvFd1WqEGXFyVAyBtbwArl1w][color=red]AURA[/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=ALkJrhj2LjYvQ9J1h11EIeBvdReRWwi7pw][color=red]NSF[/color][/url][/align][img]http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/image/0201/ngc6822_noao_big.jpg[/img]
[color=green][b]说明:[/b]邻近的星系[/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/messier/xtra/ngc/n6822.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=ALkJrhjAs6JvNl1_A2wIBBym8uCEJ6fMKA][color=green]NGC 6822[/color][/url][color=green]在许多方面都很不寻常，首先，这个星系的恒星分布形态，让它被归类成[/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/ap001023.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=ALkJrhhZUg63ks-kxv4Rz4ez1MAGAlpRIw][color=green]矮[/color][/url][color=green] [/color][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/messier/irre.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=ALkJrhjbewEJyl8dQNH4PM2Wj5sJHU54iQ][color=green]不规则星系[/color][/url][color=green] ，不过从地球看出去，它的形状却很接近一个矩形。 [align=left]对天文学家来说， [url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.ctio.noao.edu/REU/ctioreu_2001/shay/pagelgs.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=ALkJrhj7jDAEI7mc63GYc1M6arBK31XYJw]NGC 6822[/url]最突出的特点是它数量异常多的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap011218.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=ALkJrhj6z0uf6WxaguvvT0gcfDZWYmJG3g]HII区[/url] ，这种区域是年轻恒星周围的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://csep10.phys.utk.edu/astr162/lect/light/ionization.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=ALkJrhgUSuDzSnZOyb3ETH4tZOs2OPAbSA]游离[/url]化[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://pearl1.lanl.gov/periodic/elements/1.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=ALkJrhj2uCdRq66M8N7V0BZywiVu5dcTqQ]氢[/url]气区。 [/align][align=left]大型的HII区又称为[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/emission_nebulae.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=ALkJrhgSp7tbEbC8keWuVm2lXFjoUsturw]发射星云[/url] ，在上面[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://adsbit.harvard.edu/cgi-bin/nph-iarticle_query%3Fbibcode%3D1925ApJ....62..409H&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-9OmOh5ImcYOIjP46zxQUU5cq2Q]这张影像[/url]中，它们分布在这个星系的四周，其中又以右上方最密集。 [/align][align=left]影像的左下方有许多的明亮恒星，而它们形成一支很松散的臂。 [/align][align=left][url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.noao.edu/image_gallery/html/im0698.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=ALkJrhizTDcG1iI3BnzdzSQZG1Z4mLPYiQ]上面影像[/url]中的NGC 6822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/n6822.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=ALkJrhhkgi6E-g1XOag61DTimzbGSgp8tQ]巴纳德星系(Barnard's Galaxy)[/url] ，距离我们只有一百五十万[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://chandra.harvard.edu/photo/cosmic_distance.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=ALkJrhjEutFT45hr94zuCdR_OJlTQ2znLw]光年[/url] ，所以是我们[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.seds.org/messier/more/local.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=ALkJrhhJvy1VMpXBRA1cG2trHg0C_Ht6rg]本星系群[/url]的成员之一。 [/align][align=left]这个[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.aao.gov.au/images/captions/aat026.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=ALkJrhigkAvbufgrSNUsqlduliR-7rUX0g]星系[/url]是包括[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap011225.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=ALkJrhhbGIyntvoIQDCKcGGLz_pGLu9ffw]哈伯V[/url]等众多著名星云的家乡。 [/align][align=left]它位在[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.adlerplanetarium.org/history/exhibits/constellations/&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=ALkJrhgHSUEhI465i68X9VLaK-6JCQJT4g]黄道[/url]的[url=http://203.208.39.99/translate_c?hl=zh-CN&sl=zh-TW&u=http://www.astro.wisc.edu/~dolan/constellations/constellations/Sagittarius.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=ALkJrhgTnj7AD3S-NjyEajME-VG7_x4a3Q]人马座(Sagittarius，射手座)[/url]内，用小型的望远镜就能看到它。[/color] ::42:: ::42:: ::42:: [size=2][color=magenta](转自成大天文学教室)[/color][/size][/align] 漂亮！感谢分享！ 很美啊NGC6822！
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