{"id":11824,"date":"2026-05-01T16:15:17","date_gmt":"2026-05-01T16:15:17","guid":{"rendered":"https:\/\/deliry.com\/?p=11824"},"modified":"2026-05-01T16:15:17","modified_gmt":"2026-05-01T16:15:17","slug":"135-ga-serait-lage-de-la-plus-ancienne-galaxie-que-nous-ayons-detectee","status":"publish","type":"post","link":"https:\/\/deliry.com\/?p=11824","title":{"rendered":"13,5 Ga serait l’\u00e2ge de la plus ancienne galaxie que nous ayons d\u00e9tect\u00e9e"},"content":{"rendered":"\n
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Astronomie<\/a><\/p>\n<\/blockquote>\n\n\n\n

L’\u00e2ge de l’Univers, c’est \u00e0 dire la date du Big bang, est de 13,8 Ga. Jusqu’alors la plus ancienne Galaxie observ\u00e9e n’\u00e9tait \u00e2g\u00e9e que de 11,0 Ga. et pr\u00e9c\u00e8de l’\u00e8re de r\u00e9ionisation de l’Univers pr\u00e9c\u00e9dant l’\u00e8re moderne de nos Galaxies. Si les premi\u00e8res \u00e9toiles ont d\u00fb se former peu avant 13,5 Ga, on ne connaissait pas de Galaxie aussi ancienne (une galaxie dat\u00e9e de 13,3 Ga a \u00e9t\u00e9 r\u00e9cemment enregistr\u00e9e). Des chercheurs proposent la date de 13,5 Ga pour une Galaxie tr\u00e8s \u00e9loign\u00e9e form\u00e9e aux confins de l’histoire de l’Univers. C’est \u00e0 peine 300 Ma apr\u00e8s la naissance de l’Univers.<\/p>\n\n\n

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Harikane & al.<\/figcaption><\/figure>\n<\/div>\n\n\n

Elle est nomm\u00e9 HD1 et l’objet reste \u00e0 confirm\u00e9 bienqu’on donne d\u00e9j\u00e0 des hypoth\u00e8ses sur sa formation ou composition. Il pourrait s’agir d’une p\u00e9pini\u00e8re pour de nouvelles \u00e9toiles qui \u00e9mettent un intense rayonnement UV. On pense par ailleurs, et les deux hypoth\u00e8ses peuvent cohabiter, qu’il y aurait un trou noir important. La distance (donc l’\u00e2ge) moins approximative de HD1 doit encore \u00eatre v\u00e9rifi\u00e9e.<\/p>\n\n\n

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Extrait d’Harikane & al. – Modifi\u00e9 et largement annot\u00e9<\/figcaption><\/figure>\n<\/div>\n\n\n

Harikane Y. & al. 2021<\/strong>\u00a0– A Search for H-Dropout Lyman Break Galaxies at z~12-16. – [\u00c0 pr\u00e9ciser\u00a0!]<\/p>\n","protected":false},"excerpt":{"rendered":"

Astronomie L’\u00e2ge de l’Univers, c’est \u00e0 dire la date du Big bang, est de 13,8 Ga. Jusqu’alors la plus ancienne Galaxie observ\u00e9e n’\u00e9tait \u00e2g\u00e9e que … <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[317,288],"tags":[],"class_list":["post-11824","post","type-post","status-publish","format-standard","hentry","category-astronomie","category-zz-a-preciser"],"_links":{"self":[{"href":"https:\/\/deliry.com\/index.php?rest_route=\/wp\/v2\/posts\/11824","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/deliry.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/deliry.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/deliry.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/deliry.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=11824"}],"version-history":[{"count":1,"href":"https:\/\/deliry.com\/index.php?rest_route=\/wp\/v2\/posts\/11824\/revisions"}],"predecessor-version":[{"id":11827,"href":"https:\/\/deliry.com\/index.php?rest_route=\/wp\/v2\/posts\/11824\/revisions\/11827"}],"wp:attachment":[{"href":"https:\/\/deliry.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=11824"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/deliry.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=11824"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/deliry.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=11824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}