{"id":11149,"date":"2019-10-17T15:31:52","date_gmt":"2019-10-17T15:31:52","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11149"},"modified":"2019-10-28T15:24:22","modified_gmt":"2019-10-28T15:24:22","slug":"zoom-sur-ngc-4651-la-curieuse-galaxie-du-parapluie","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/10\/17\/zoom-sur-ngc-4651-la-curieuse-galaxie-du-parapluie\/","title":{"rendered":"Zoom sur NGC 4651, la curieuse galaxie du Parapluie"},"content":{"rendered":"

On la surnomme la galaxie du Parapluie en raison de sa forme assez inhabituelle. Zoom sur NGC 4651 dans la Chevelure de B\u00e9r\u00e9nice.<\/strong><\/p>\n

Voyage dans la Chevelure de B\u00e9r\u00e9nice :<\/h5>\n

Mais qu’est-il arriv\u00e9 \u00e0 la galaxie NGC 4651 ? Pour le savoir il faut se rendre dans la Chevelure de B\u00e9r\u00e9nice, entre les constellations du Bouvier<\/a> et du Lion<\/a>. Le nom de ce groupe d’\u00e9toiles fait r\u00e9f\u00e9rence \u00e0 la reine B\u00e9r\u00e9nice II d’\u00c9gypte, qui sacrifia sa longue chevelure comme offrande \u00e0 Aphrodite. C’est dans cette constellation que se niche NGC 4651, une galaxie de magnitude<\/a> 10,8. Situ\u00e9e \u00e0 environ 35 millions d\u2019ann\u00e9es-lumi\u00e8re de nous, elle a \u00e9t\u00e9 d\u00e9couverte par William Herschel<\/a> le 30 d\u00e9cembre 1783. Elle a ensuite \u00e9t\u00e9 int\u00e9gr\u00e9e au New General Catalog Objects<\/em>, l’un des catalogues d’objets c\u00e9lestes les plus connus dans le domaine de l’astronomie amateur, avec le catalogue Messier<\/a>.<\/p>\n

\"\"<\/a>
NGC 4651, l’\u00e9tonnante galaxie du Parapluie .\u00a9 R. Jay Gabany et al.<\/figcaption><\/figure>\n

NGC 4651 pr\u00e9sente une curieuse excroissance en forme de parapluie aussi longue (50.000 ann\u00e9es-lumi\u00e8re) que son propre diam\u00e8tre.<\/p>\n

Cannibalisme stellaire :<\/h5>\n

Des observations men\u00e9es il y a quelques ann\u00e9es avec les t\u00e9lescopes Subaru<\/a> et Keck<\/a> (tous les deux sur l’\u00eele d’Hawa\u00ef) ont permis de mieux comprendre l’origine de cet appendice. Il s’agit en fait d’un courant d’\u00e9toiles dont les membres, originaires d’une petite galaxie voisine, ont \u00e9t\u00e9 captur\u00e9s gravitationnellement. Ce genre de cannibalisme stellaire s’observe dans d’autres galaxies. On le soup\u00e7onne dans le cas de notre voisine la galaxie d’Androm\u00e8de<\/a> mais \u00e9galement dans notre propre Voie lact\u00e9e<\/a>.<\/p>\n

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

Parfois les deux protagonistes sont de taille comparable et aucune des deux galaxies ne parvient \u00e0 dig\u00e9rer l’autre. Le gaz et les \u00e9toiles des deux se m\u00e9langent et le r\u00e9sultat est \u00e9tonnant, comme pour Les Antennes<\/a> dans la constellation du Corbeau (image ci-dessus).<\/p>\n","protected":false},"excerpt":{"rendered":"

On la surnomme la galaxie du Parapluie en raison de sa forme assez inhabituelle. Zoom sur NGC 4651 dans la Chevelure de B\u00e9r\u00e9nice. Voyage dans la Chevelure de B\u00e9r\u00e9nice : Mais qu’est-il arriv\u00e9 \u00e0 la galaxie NGC 4651 ? Pour le savoir il faut se rendre dans la Chevelure de B\u00e9r\u00e9nice, entre les constellations du … Continuer la lecture de Zoom sur NGC 4651, la curieuse galaxie du Parapluie<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":11150,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[2713,112,2712],"class_list":["post-11149","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-chevelure-de-berenice","tag-galaxie","tag-ngc-4651"],"yoast_head":"\nZoom sur NGC 4651, la curieuse galaxie du Parapluie<\/title>\n<meta name=\"description\" content=\"On la surnomme la galaxie du Parapluie en raison de sa forme assez inhabituelle. 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