{"id":652,"date":"2016-09-04T09:32:45","date_gmt":"2016-09-04T07:32:45","guid":{"rendered":"http:\/\/blogs.futura-sciences.com\/barrau\/?p=652"},"modified":"2016-09-04T09:33:54","modified_gmt":"2016-09-04T07:33:54","slug":"galaxie-faite-a-99-99-de-matiere-noire","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/barrau\/2016\/09\/04\/galaxie-faite-a-99-99-de-matiere-noire\/","title":{"rendered":"Une galaxie faite \u00e0 99.99% de mati\u00e8re noire !"},"content":{"rendered":"<p>La mati\u00e8re noire a une longue histoire. Son existence a \u00e9t\u00e9 suppos\u00e9e pour la premi\u00e8re fois en 1933 et a \u00e9t\u00e9 confirm\u00e9e de fa\u00e7on fiable en 1970. C\u2019est un myst\u00e8re qui dure et c&#8217;est rare ! Il y a quelques temps, une petite anomalie, peut-\u00eatre un signe de nouvelle physique, a \u00e9t\u00e9 d\u00e9tect\u00e9e aupr\u00e8s du grand collisionneur LHC du CERN. S\u2019ensuivit une intense excitation. H\u00e9las il ne s\u2019agissait que d\u2019une fluctuation statistique : rien de s\u00e9rieux. Au contraire, les indications en faveur de l\u2019existence de mati\u00e8re noire ne font que s\u2019accumuler avec le temps ! Il est maintenant presque certain que la mati\u00e8re noire existe bel et bien.<\/p>\n<p>Mais qu\u2019est-elle ? Ca, nous ne le savons pas ! Il existe de la mati\u00e8re noire \u00ab standard \u00bb, compos\u00e9e de protons et de neutrons. Elle est sans doute 10 fois plus abondante que la mati\u00e8re visible (elle-m\u00eame essentiellement faite d\u2019\u00e9toiles). Mais il existe aussi de la mati\u00e8re noire \u00ab exotique \u00bb qui n\u2019est pas faite de protons et de neutrons ! Nous ignorons tout des particules qui la compose. Et elle est environ 5 fois plus abondante que la mati\u00e8re noire standard et donc 50 fois plus abondante que les \u00e9toiles.<\/p>\n<figure id=\"attachment_654\" aria-describedby=\"caption-attachment-654\" style=\"width: 712px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-654\" src=\"https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2016\/09\/Revised_Dragonfly-44.jpg\" alt=\"La galaxie Dragonfly 44.\" width=\"712\" height=\"362\" srcset=\"https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2016\/09\/Revised_Dragonfly-44.jpg 712w, https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2016\/09\/Revised_Dragonfly-44-450x229.jpg 450w\" sizes=\"auto, (max-width: 712px) 100vw, 712px\" \/><figcaption id=\"caption-attachment-654\" class=\"wp-caption-text\">La galaxie Dragonfly 44.<\/figcaption><\/figure>\n<p><!--more--><\/p>\n<p>Un nouvel \u00e9l\u00e9ment vient s\u2019ajouter \u00e0 ce puzzle. R\u00e9cemment a \u00e9t\u00e9 d\u00e9tect\u00e9e une galaxie, Dragonfly 44, dont la masse totale est importante &#8211; de l\u2019ordre de mille milliards de fois la masse du Soleil, comme notre propre galaxie &#8211; mais qui n\u2019est compos\u00e9e presque que de mati\u00e8re noire. Les \u00e9toiles ne repr\u00e9sentent que 0.01% de la masse totale de cette galaxie ! Le fait que ces peu nombreuses \u00e9toiles restent li\u00e9es laissait penser que la masse totale \u00e9tait beaucoup plus grande (ce qui stabilise la structure). C\u2019est exactement ce que les mesures ont ensuite confirm\u00e9 : les vitesses des \u00e9toiles ne s\u2019expliquent que si la galaxie a une masse 10 000 fois plus grande que celle de la mati\u00e8re visible. Elle est donc faite \u00e0 99.99% de mati\u00e8re noire.<\/p>\n<p>On connaissait d\u00e9j\u00e0 quelques tr\u00e8s petites galaxies qui \u00e9taient compos\u00e9es presque uniquement de mati\u00e8re noire. Mais pas de galaxies si imposantes. C\u2019est \u00e0 la fois tr\u00e8s int\u00e9ressant pour la mati\u00e8re noire en elle-m\u00eame mais aussi pour les sc\u00e9narios de formation de galaxies car de tels objets ne sont actuellement pas attendus. Le myst\u00e8re demeure.<\/p>\n<p>L&#8217;article de recherche est lisible ici\u00a0<a href=\"http:\/\/arxiv.org\/pdf\/1606.06291v2.pdf\">http:\/\/arxiv.org\/pdf\/1606.06291v2.pdf<\/a><\/p>\n<figure id=\"attachment_656\" aria-describedby=\"caption-attachment-656\" style=\"width: 474px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-large wp-image-656\" src=\"https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2016\/09\/3D_distribution_of_dark_matter_in_the_Universe-1024x778.jpg\" alt=\"HST\" width=\"474\" height=\"360\" srcset=\"https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2016\/09\/3D_distribution_of_dark_matter_in_the_Universe-1024x778.jpg 1024w, https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2016\/09\/3D_distribution_of_dark_matter_in_the_Universe-450x342.jpg 450w, https:\/\/blogs.futura-sciences.com\/barrau\/wp-content\/uploads\/sites\/12\/2016\/09\/3D_distribution_of_dark_matter_in_the_Universe-768x584.jpg 768w\" sizes=\"auto, (max-width: 474px) 100vw, 474px\" \/><figcaption id=\"caption-attachment-656\" class=\"wp-caption-text\">R\u00e9partition 3D de la mati\u00e8re noire (sans lien avec la galaxie Dragonfly 44). Cr\u00e9dit HST.<\/figcaption><\/figure>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>La mati\u00e8re noire a une longue histoire. Son existence a \u00e9t\u00e9 suppos\u00e9e pour la premi\u00e8re fois en 1933 et a \u00e9t\u00e9 confirm\u00e9e de fa\u00e7on fiable en 1970. C\u2019est un myst\u00e8re qui dure et c&#8217;est rare ! Il y a quelques temps, une petite anomalie, peut-\u00eatre un signe de nouvelle physique, a \u00e9t\u00e9 d\u00e9tect\u00e9e aupr\u00e8s du &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/barrau\/2016\/09\/04\/galaxie-faite-a-99-99-de-matiere-noire\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Une galaxie faite \u00e0 99.99% de mati\u00e8re noire !<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":10,"featured_media":655,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[8],"tags":[11],"class_list":["post-652","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cosmos","tag-matiere-noire"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Une galaxie faite \u00e0 99.99% de mati\u00e8re noire !, par Aur\u00e9lien BARRAU<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/barrau\/2016\/09\/04\/galaxie-faite-a-99-99-de-matiere-noire\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Une galaxie faite \u00e0 99.99% de mati\u00e8re noire !, par Aur\u00e9lien BARRAU\" \/>\n<meta property=\"og:description\" content=\"La mati\u00e8re noire a une longue histoire. 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