{"id":1107798,"date":"2022-01-10T10:24:55","date_gmt":"2022-01-10T09:24:55","guid":{"rendered":"https:\/\/www.tomsguide.fr\/?p=1107798"},"modified":"2023-06-12T19:32:28","modified_gmt":"2023-06-12T17:32:28","slug":"des-astronomes-decouvrent-une-etrange-galaxie-depourvue-de-matiere-noire","status":"publish","type":"post","link":"https:\/\/www.tomsguide.fr\/des-astronomes-decouvrent-une-etrange-galaxie-depourvue-de-matiere-noire\/","title":{"rendered":"On a d\u00e9couvert une \u00e9trange galaxie d\u00e9pourvue de mati\u00e8re noire"},"content":{"rendered":"\n
\"Galaxies\"
Galaxies \u00a9 Image d’illustration Unsplash<\/figcaption><\/figure>\n\n\n\n

En se basant sur des d\u00e9cennies d’observations au t\u00e9lescope et des milliers de simulations informatiques, les scientifiques consid\u00e8rent d\u00e9sormais la mati\u00e8re noire comme le squelette cach\u00e9 du cosmos<\/strong>. Pourtant, il y a trois ans, des astronomes ont rep\u00e9r\u00e9 six galaxies myst\u00e9rieusement diffuses<\/strong>, ressemblant \u00e0 d’immenses tentacules d’\u00e9toiles et de gaz. Et contrairement \u00e0 presque toutes les autres galaxies jamais observ\u00e9es \u2014 y compris notre propre Voie lact\u00e9e \u2014 elles ne semblaient pas \u00eatre entour\u00e9es d’\u00e9normes masses de mati\u00e8re noire<\/strong>. <\/p>\n\n\n\n

L’\u00e9quipe aura finalement d\u00e9cid\u00e9 de zoomer sur l’une d’entre elles, la galaxie AGC 114905<\/strong>, avec l’aide du Very Large Array, un r\u00e9seau de 27 antennes paraboliques mobiles de 25 m\u00e8tres de diam\u00e8tre chacune, situ\u00e9 au Nouveau-Mexique. Trois ans et pr\u00e8s de 40 heures de donn\u00e9es r\u00e9colt\u00e9es plus tard, les astronomes sont formels :\u00a0la quantit\u00e9 de mati\u00e8re noire rep\u00e9r\u00e9e dans cette galaxie est largement inf\u00e9rieure<\/strong> \u00e0 celle que l’on peut trouver ailleurs.<\/p>\n\n\n\n

Des galaxies ultra-diffuses qui, sauf erreur math\u00e9matique, seraient presque d\u00e9nu\u00e9es de mati\u00e8re noire<\/h2>\n\n\n\n

D\u00e9sormais nomm\u00e9es \u00ab galaxies ultra-diffuses \u00bb<\/strong>, ces astres affichent des valeurs \u00e0 la fois aberrantes et extr\u00eames : en termes de masse, elles sont minuscules, mais elles s’\u00e9tendent sur de vastes distances. Certaines sont aussi grandes que la Voie lact\u00e9e, mais disposent de tr\u00e8s peu d’\u00e9toiles en leur sein. Elles sont \u00e9galement tr\u00e8s transparentes<\/strong> et donc, plus difficiles \u00e0 d\u00e9tecter.<\/p>\n\n\n\n

\u00ab\u00a0Nous avons rapidement examin\u00e9 nos simulations et nous n’avons rien qui ressemble \u00e0 cette galaxie<\/em> \u00bb, indique Laura Sales, astrophysicienne \u00e0 l’Universit\u00e9 de Californie. Pour tenter de r\u00e9soudre cette \u00e9nigme, l’\u00e9quipe d’astronomes \u00e9voque la th\u00e9orie de la dynamique newtonienne modifi\u00e9e<\/strong>, une alternative au concept de mati\u00e8re noire dont l’existence n’a toujours pas pu \u00eatre mise en \u00e9vidence. <\/p>\n\n\n\n

Voir aussi : Hubble capture une vue incroyable d\u2019une galaxie \u00e0 150 millions d\u2019ann\u00e9es-lumi\u00e8re de la Terre<\/a><\/strong><\/p>\n\n\n\n

Dans les grandes lignes, cette th\u00e9orie \u00e9met l’hypoth\u00e8se que la physique gravitationnelle standard<\/strong>, qui explique avec pr\u00e9cision les mouvements d’objets avec des acc\u00e9l\u00e9rations gravitationnelles \u00e9lev\u00e9es (comme les plan\u00e8tes de notre syst\u00e8me solaire) pourrait ne pas s’appliquer de la m\u00eame mani\u00e8re aux \u00e9toiles en orbite lente<\/strong> aux abords d’un disque de galaxie. Les vitesses attendues des \u00e9toiles et la vitesse \u00e0 laquelle elles semblent se d\u00e9placer pourrait ainsi ne pas indiquer une masse manquante, mais plut\u00f4t une erreur math\u00e9matique.<\/p>\n\n\n\n

\u00c0 ce jour, ces galaxies restent donc \u00e9nigmatiques pour la communaut\u00e9 scientifique. Mais AGC 114905 n’est toutefois pas la seule exception \u00e0 la r\u00e8gle, puisqu’en 2016, un groupe d’astronomes avait rep\u00e9r\u00e9 16 galaxies tr\u00e8s diffuses, dont NGC 1052-DF2, qui semblaient \u00e9galement contenir peu ou pas de mati\u00e8re noire<\/a>. L’\u00e9quipe indique qu’elle continuera d’examiner ces astres \u00e9tonnants dans les ann\u00e9es \u00e0 venir, y compris avec l’aide du t\u00e9lescope spatial James Webb, r\u00e9cemment lanc\u00e9<\/a>.<\/p>\n\n\n\n

Source : Monthly Notices of the Royal Astronomical Society (Oxford Academic)<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

En 2019, Pavel Mancera Pi\u00f1a et ses coll\u00e8gues de l'Universit\u00e9 de Groningue aux Pays-Bas avaient identifi\u00e9 six \u00e9tonnantes galaxies, toutes a priori d\u00e9pourvues de mati\u00e8re noire. Pourtant, en th\u00e9orie, la Voie lact\u00e9e dispose de cette\u2026<\/p>","protected":false},"author":93,"featured_media":1107812,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[494,3872],"tags":[],"hubs":[],"acf":{"display_mode":"medium-img","post_show_excerpt":true,"post_source":"","hide_sidebar":false,"hide_advertising":false},"yoast_head":"\nOn a d\u00e9couvert une \u00e9trange galaxie d\u00e9pourvue de mati\u00e8re noire<\/title>\n<meta name=\"description\" content=\"En 2019, Pavel Mancera Pi\u00f1a et ses coll\u00e8gues de l'Universit\u00e9 de Groningue aux Pays-Bas avaient identifi\u00e9 six \u00e9tonnantes galaxies, toutes a priori d\u00e9pourvues de mati\u00e8re noire. 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Passionn\u00e9 de science-fiction et d'astronomie. Anciennement chez PaperGeek et Tom's Hardware pour des dossiers autour du jeu vid\u00e9o.","sameAs":["https:\/\/www.linkedin.com\/in\/aymeric-geoffre-rouland\/","https:\/\/x.com\/aym_geo"],"url":"https:\/\/www.tomsguide.fr\/author\/aymeric\/"}]}},"_links":{"self":[{"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/posts\/1107798"}],"collection":[{"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/users\/93"}],"replies":[{"embeddable":true,"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/comments?post=1107798"}],"version-history":[{"count":0,"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/posts\/1107798\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/media\/1107812"}],"wp:attachment":[{"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/media?parent=1107798"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/categories?post=1107798"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/tags?post=1107798"},{"taxonomy":"hubs","embeddable":true,"href":"https:\/\/www.tomsguide.fr\/wp-json\/wp\/v2\/hubs?post=1107798"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}