{"id":83053,"date":"2026-04-05T12:03:28","date_gmt":"2026-04-05T12:03:28","guid":{"rendered":"https:\/\/www.africa-press.net\/centrafricaine\/politique\/la-longue-histoire-dune-galaxie-reconstituee"},"modified":"2026-04-05T12:12:03","modified_gmt":"2026-04-05T12:12:03","slug":"la-longue-histoire-dune-galaxie-reconstituee","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/centrafricaine\/toutes-les-actualites\/la-longue-histoire-dune-galaxie-reconstituee","title":{"rendered":"La longue histoire d&rsquo;une galaxie reconstitu\u00e9e"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; CentrAfricaine. <\/strong><\/span>La galaxie NGC 1365, est une grande galaxie spirale vue presque de face depuis la Terre et situe\u0301e a\u0300 une cinquantaine d&rsquo;anne\u0301es-lumie\u0300re de cette dernie\u0300re. Des astronomes ont pu cartographier avec une finesse rare la re\u0301partition de l&rsquo;oxyge\u0300ne dans son gaz, en s&rsquo;appuyant sur les donne\u0301es du releve\u0301 TYPHOON obtenues au te\u0301lescope Ire\u0301ne\u0301e du Pont, a\u0300 Las Campanas, au Chili. Une technique d&rsquo;arche\u0301ologie galactique qui est en plein essor.<\/p>\n<p><b>Traque chimique dans une galaxie<\/b><\/p>\n<p>Les e\u0301le\u0301ments lourds comme l&rsquo;oxyge\u0300ne sont fabrique\u0301s par les e\u0301toiles puis disperse\u0301s dans le gaz interstellaire. Leur re\u0301partition n&rsquo;est donc pas ale\u0301atoire: elle de\u0301pend des lieux ou\u0300 les e\u0301toiles se sont forme\u0301es, des explosions de supernovas, des courants de gaz et des fusions avec d&rsquo;autres galaxies. En observant les raies lumineuses e\u0301mises par le gaz excite\u0301 autour de jeunes e\u0301toiles, les astronomes ont pu dresser une carte chimique tre\u0300s de\u0301taille\u0301e de NGC 1365, avec 4546 zones analyse\u0301es a\u0300 une re\u0301solution d&rsquo;environ 175 anne\u0301es-lumie\u0300re. C&rsquo;est, selon les auteurs qui publient leurs re\u0301sultats dans la revue Nature Astronomy, l&rsquo;un des releve\u0301s chimiques les plus pre\u0301cis jamais obtenus pour une galaxie spirale hors de la no\u0302tre.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"270\" class=\"alignnone wp-image-83051 size-full\" src=\"https:\/\/static.africa-press.net\/centrafricaine\/sites\/45\/2026\/04\/sm_1775378132.36827.jpg\" srcset=\"https:\/\/static.africa-press.net\/centrafricaine\/sites\/45\/2026\/04\/sm_1775378132.36827.jpg 453w, https:\/\/static.africa-press.net\/centrafricaine\/sites\/45\/2026\/04\/sm_1775378132.36827-300x179.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Douze milliards d&rsquo;anne\u0301es d&rsquo;historique<\/b><\/p>\n<p>L&rsquo;e\u0301quipe a ensuite compare\u0301 cette carte a\u0300 des simulations cosmologiques du projet IllustrisTNG pour retrouver le sce\u0301nario le plus plausible. Le tableau qui se dessine est celui d&rsquo;une galaxie qui a commence\u0301 modestement avant de grossir par e\u0301tapes successives. La partie principale du disque se serait mise en place tre\u0300s to\u0302t, il y a environ 11,9 a\u0300 12,5 milliards d&rsquo;anne\u0301es, gra\u0302ce a\u0300 plusieurs fusions avec de petites galaxies naines.<\/p>\n<p>Une partie interne lie\u0301e a\u0300 la barre se serait enrichie plus lentement au fil du temps, tandis qu&rsquo;un disque de gaz plus e\u0301tendu se serait assemble\u0301 plus re\u0301cemment, il y a environ 5,9 a\u0300 8,6 milliards d&rsquo;anne\u0301es, a\u0300 la faveur d&rsquo;une fusion mineure. En clair, NGC 1365 ne s&rsquo;est pas construite d&rsquo;un seul bloc, mais par ajouts successifs, un peu comme beaucoup de grandes galaxies spirales, y compris (peut-e\u0302tre) la Voie lacte\u0301e.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">CentrAfricaine<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; CentrAfricaine. La galaxie NGC 1365, est une grande galaxie spirale vue presque de face depuis la Terre et situe\u0301e a\u0300 une cinquantaine d&rsquo;anne\u0301es-lumie\u0300re de cette dernie\u0300re. Des astronomes ont pu cartographier avec une finesse rare la re\u0301partition de l&rsquo;oxyge\u0300ne dans son gaz, en s&rsquo;appuyant sur les donne\u0301es du releve\u0301 TYPHOON obtenues au te\u0301lescope [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":83052,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[30],"class_list":["post-83053","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-centrafricaine"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>La longue histoire d&#039;une galaxie reconstitu\u00e9e - centrafricaine<\/title>\n<meta name=\"description\" content=\"La galaxie NGC 1365, est une grande galaxie spirale vue presque de face depuis la Terre et situe\u0301e a\u0300 une cinquantaine d ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/centrafricaine\/toutes-les-actualites\/la-longue-histoire-dune-galaxie-reconstituee\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La longue histoire d&#039;une galaxie reconstitu\u00e9e\" \/>\n<meta property=\"og:description\" content=\"La galaxie NGC 1365, est une grande galaxie spirale vue presque de face depuis la Terre et situe\u0301e a\u0300 une cinquantaine d ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/centrafricaine\/toutes-les-actualites\/la-longue-histoire-dune-galaxie-reconstituee\" \/>\n<meta property=\"og:site_name\" content=\"centrafricaine\" \/>\n<meta property=\"article:published_time\" content=\"2026-04-05T12:03:28+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-04-05T12:12:03+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/centrafricaine\/sites\/45\/2026\/04\/sm_1775378137.514581.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"3 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/centrafricaine\/toutes-les-actualites\/la-longue-histoire-dune-galaxie-reconstituee#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/centrafricaine\/toutes-les-actualites\/la-longue-histoire-dune-galaxie-reconstituee\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/centrafricaine\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"La longue histoire d&rsquo;une galaxie reconstitu\u00e9e\",\"datePublished\":\"2026-04-05T12:03:28+00:00\",\"dateModified\":\"2026-04-05T12:12:03+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/centrafricaine\/toutes-les-actualites\/la-longue-histoire-dune-galaxie-reconstituee\"},\"wordCount\":415,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/centrafricaine\/toutes-les-actualites\/la-longue-histoire-dune-galaxie-reconstituee#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/centrafricaine\/sites\/45\/2026\/04\/sm_1775378137.514581.jpg\",\"keywords\":[\"CentrAfricaine\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/centrafricaine\/toutes-les-actualites\/la-longue-histoire-dune-galaxie-reconstituee#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/centrafricaine\/toutes-les-actualites\/la-longue-histoire-dune-galaxie-reconstituee\",\"url\":\"https:\/\/www.africa-press.net\/centrafricaine\/toutes-les-actualites\/la-longue-histoire-dune-galaxie-reconstituee\",\"name\":\"La longue histoire d'une galaxie reconstitu\u00e9e - 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