{"id":5131,"date":"2016-03-17T17:24:51","date_gmt":"2016-03-17T17:24:51","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=5131"},"modified":"2016-03-23T14:14:15","modified_gmt":"2016-03-23T14:14:15","slug":"le-fuseau-poussiereux-de-la-galaxie-lenticulaire-ngc-5866","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/03\/17\/le-fuseau-poussiereux-de-la-galaxie-lenticulaire-ngc-5866\/","title":{"rendered":"Le fuseau poussi\u00e9reux de la galaxie lenticulaire NGC 5866"},"content":{"rendered":"

La constellation du Dragon h\u00e9berge une curieuse galaxie, NGC 5866. Vue exactement par la tranche, elle r\u00e9v\u00e8le un long fuseau poussi\u00e9reux.<\/strong><\/p>\n

Coinc\u00e9e entre la Petite et la Grande Ourse<\/a>, la constellation bor\u00e9ale du Dragon abrite une surprenante galaxie lenticulaire, NGC 5866. Situ\u00e9e \u00e0 44 millions d’ann\u00e9es-lumi\u00e8re de nous, NGC 5866 est \u00e0 l’origine d’une incertitude dans le catalogue Messier<\/a>. Son observation est rapport\u00e9e par l’astronome fran\u00e7ais Pierre M\u00e9chain en 1781 et Charles Messier la classe alors dans son catalogue des objets n\u00e9buleux comme M 102 ; mais quelques temps plus tard M\u00e9chain signale qu’il s’est tromp\u00e9 et que son observation correspond en fait \u00e0 une galaxie d\u00e9j\u00e0 connue, M 101<\/a> dite la galaxie du Moulinet.<\/p>\n

\"ngc_5866\"<\/a><\/p>\n

M\u00eame si l’image ci-dessus (prise par le t\u00e9lescope spatial Hubble<\/a> en novembre 2005) semble assez inhabituelle, la finesse de ce disque galactique n’a rien d’exceptionnel. D’autres galaxies pourraient nous montrer le m\u00eame profil mais nous ne les voyons pas exactement par la tranche comme c’est le cas avec NGC 5866.<\/p>\n

Si nous observons attentivement cette galaxie, nous remarquons au centre de la bande poussi\u00e9reuse un subtil renflement orang\u00e9 qui constitue le noyau galactique et ses vieilles \u00e9toiles rougissantes. La bande de poussi\u00e8re qui s’\u00e9tire de part et d’autre de ce bulbe central est l\u00e9g\u00e8rement d\u00e9form\u00e9e, sans doute en raison d’une perturbation gravitationnelle occasionn\u00e9e par une rencontre avec une autre galaxie il y a longtemps. Les jeunes \u00e9toiles bleues s’\u00e9tendent sur les bords du disque galactique vu par la tranche dans le prolongement de la zone poussi\u00e9reuse, tandis qu’un halo d’\u00e9toiles beaucoup plus vaste encercle le disque galactique.<\/p>\n

Pour contempler facilement une belle galaxie de profil, rien de plus simple. Il vous suffit de sortir une nuit d’\u00e9t\u00e9 et de vous \u00e9loigner de toute pollution lumineuse<\/a>\u00a0: en levant les yeux vous pourrez admirer notre propre Voie lact\u00e9e<\/a>\u00a0qui est un autre exemple de galaxie vue par la tranche !<\/p>\n","protected":false},"excerpt":{"rendered":"

La constellation du Dragon h\u00e9berge une curieuse galaxie, NGC 5866. Vue exactement par la tranche, elle r\u00e9v\u00e8le un long fuseau poussi\u00e9reux. Coinc\u00e9e entre la Petite et la Grande Ourse, la constellation bor\u00e9ale du Dragon abrite une surprenante galaxie lenticulaire, NGC 5866. Situ\u00e9e \u00e0 44 millions d’ann\u00e9es-lumi\u00e8re de nous, NGC 5866 est \u00e0 l’origine d’une incertitude … Continuer la lecture de Le fuseau poussi\u00e9reux de la galaxie lenticulaire NGC 5866<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":5132,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[1522,1521,89,1519,1520,544,166],"class_list":["post-5131","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-catalogue-messier","tag-constellation-du-dragon","tag-etoile","tag-galaxie-lenticulaire","tag-ngc-5866","tag-telescope-spatial-hubble","tag-voie-lactee"],"yoast_head":"\nLe fuseau poussi\u00e9reux de la galaxie lenticulaire NGC 5866<\/title>\n<meta name=\"description\" content=\"La constellation du Dragon h\u00e9berge une curieuse galaxie, NGC 5866. 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