{"id":96277,"date":"2025-03-13T15:06:50","date_gmt":"2025-03-13T15:06:50","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede"},"modified":"2025-03-13T15:06:50","modified_gmt":"2025-03-13T15:06:50","slug":"la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede","title":{"rendered":"La plus petite galaxie connue d\u00e9couverte \u00e0 c\u00f4t\u00e9 d’Androm\u00e8de"},"content":{"rendered":"

Africa-Press – C\u00f4te d’Ivoire. <\/strong><\/span>C’est la galaxie la plus imperceptible que l’on puisse trouver autour de nous, donc c’est un syste\u0300me pluto\u0302t sympa. Mais c’est aussi inattendu a\u0300 bien des e\u0301gards\u00a0\u00bb. Voila\u0300 comment l’astronome Eric Bell pre\u0301sente (dans un communique\u0301) Androme\u0300de XXXV. Cette minuscule galaxie est un satellite de notre plus proche voisine, la galaxie d’Androme\u0300de, situe\u0301e a\u0300 quelque 3 millions d’anne\u0301es-lumie\u0300re. Cet objet, de\u0301couvert par une e\u0301quipe de l\u2019Universite\u0301 du Michigan (Etats-Unis), remet en question certains mode\u0300les d\u2019e\u0301volution galactique.<\/p>\n

Minuscule et intrigante<\/b><\/p>\n

Les galaxies satellites comme Androme\u0300de XXXV sont des objets gravitationnellement lie\u0301s a\u0300 une galaxie plus massive, en l\u2019occurrence Androme\u0300de. La Voie lacte\u0301e posse\u0300de e\u0301galement plusieurs galaxies satellites: les plus connues sont les nuages de Magellan, mais il y en existe des dizaines d’autres. Parce qu’elles sont beaucoup plus petites, ces galaxies satellites sont aussi beaucoup plus sombres et plus difficiles a\u0300 repe\u0301rer. Ce n’est qu’au cours des deux dernie\u0300res de\u0301cennies que les astronomes ont eu acce\u0300s a\u0300 des technologies suffisamment sensibles pour de\u0301couvrir la plupart des satellites connus de la Voie lacte\u0301e.<\/p>\n

<\/p>\n

Pour de\u0301couvrir Androme\u0300de XXXV, Marcos Arias, principal auteur de l’e\u0301tude publie\u0301e dans la revue Astrophysical Journal Letters, a d’abord e\u0301tudie\u0301 d’immenses ensembles de donne\u0301es d’observation afin de rechercher de nouvelles galaxies satellites. Apre\u0300s avoir compile\u0301 une liste de candidats prometteurs, il a obtenu du temps sur le te\u0301lescope spatial Hubble pour effectuer une observation plus approfondie. Gra\u0302ce a\u0300 Hubble, les chercheurs ont de\u0301couvert qu’Androme\u0300de XXXV n’e\u0301tait pas seulement une galaxie satellite, mais qu’elle e\u0301tait e\u0301galement assez petite pour changer certaines notions sur l’e\u0301volution des galaxies, notamment la dure\u0301e pendant laquelle elles sont capables de former des e\u0301toiles.<\/p>\n

Seulement 20.000 masses solaires<\/b><\/p>\n

La plupart des satellites de la Voie lacte\u0301e ont des populations d’e\u0301toiles tre\u0300s anciennes car elles ont cesse\u0301 de former des e\u0301toiles il y a environ 10 milliards d’anne\u0301es. Or les donne\u0301es indiquent qu’Androme\u0300de XXXV a continue\u0301 a\u0300 former des e\u0301toiles bien plus longtemps, jusqu\u2019a\u0300 il y a 6 milliards d\u2019anne\u0301es. Une diffe\u0301rence qui sugge\u0300re que le ro\u0302le des galaxies principales pourrait e\u0302tre plus important qu’on ne le pensait.<\/p>\n

L\u2019une des conse\u0301quences les plus intrigantes de cette de\u0301couverte concerne l\u2019histoire thermique de l\u2019Univers. Dans ses premiers a\u0302ges, l\u2019Univers e\u0301tait un endroit relativement tempe\u0301re\u0301, propice a\u0300 la formation d\u2019e\u0301toiles. Cependant, avec l\u2019apparition des premie\u0300res ge\u0301ne\u0301rations d\u2019e\u0301toiles et l\u2019activite\u0301 intense des trous noirs, l\u2019environnement cosmique s\u2019est progressivement re\u0301chauffe\u0301, rendant difficile l\u2019accumulation du gaz ne\u0301cessaire a\u0300 la formation d\u2019e\u0301toiles dans les petites galaxies.<\/p>\n

Les mode\u0300les actuels sugge\u0300rent que les galaxies de moins de 100.000 masses solaires auraient du\u0302 perdre leur gaz il y a environ 10 milliards d’anne\u0301es.Or Androme\u0300de XXXV, avec seulement 20.000 masses solaires, a continue\u0301 a\u0300 former des e\u0301toiles bien apre\u0300s cette pe\u0301riode critique. \u00ab\u00a0Nous pensions que ce type de galaxies n’aurait pas pu survivre au re\u0301chauffement de l\u2019Univers, mais Androme\u0300de XXXV prouve que ce n\u2019est pas aussi simple\u00a0\u00bb, conclut Eric Bell.<\/p>\n

Pour plus d’informations et d’analyses sur la C\u00f4te d’Ivoire<\/span>, suivez Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"

Africa-Press – C\u00f4te d’Ivoire. C’est la galaxie la plus imperceptible que l’on puisse trouver autour de nous, donc c’est un syste\u0300me pluto\u0302t sympa. Mais c’est aussi inattendu a\u0300 bien des e\u0301gards\u00a0\u00bb. Voila\u0300 comment l’astronome Eric Bell pre\u0301sente (dans un communique\u0301) Androme\u0300de XXXV. Cette minuscule galaxie est un satellite de notre plus proche voisine, la galaxie […]<\/p>\n","protected":false},"author":82,"featured_media":96276,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37],"class_list":["post-96277","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire-2"],"yoast_head":"\nLa plus petite galaxie connue d\u00e9couverte \u00e0 c\u00f4t\u00e9 d'Androm\u00e8de - C\u00f4te d'Ivoire<\/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:\/\/www.africa-press.net\/cotedivoire\/politique\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"La plus petite galaxie connue d\u00e9couverte \u00e0 c\u00f4t\u00e9 d'Androm\u00e8de\" \/>\n<meta property=\"og:description\" content=\"Africa-Press – C\u00f4te d’Ivoire. C’est la galaxie la plus imperceptible que l’on puisse trouver autour de nous, donc c’est un syste\u0300me pluto\u0302t sympa. Mais c’est aussi inattendu a\u0300 bien des e\u0301gards\u00a0\u00bb. Voila\u0300 comment l’astronome Eric Bell pre\u0301sente (dans un communique\u0301) Androme\u0300de XXXV. Cette minuscule galaxie est un satellite de notre plus proche voisine, la galaxie […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede\" \/>\n<meta property=\"og:site_name\" content=\"C\u00f4te d'Ivoire\" \/>\n<meta property=\"article:published_time\" content=\"2025-03-13T15:06:50+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1741866081.89892.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"453\" \/>\n\t<meta property=\"og:image:height\" content=\"427\" \/>\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\/cotedivoire\/politique\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"La plus petite galaxie connue d\u00e9couverte \u00e0 c\u00f4t\u00e9 d’Androm\u00e8de\",\"datePublished\":\"2025-03-13T15:06:50+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede\"},\"wordCount\":621,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1741866084.257763.jpg\",\"keywords\":[\"C\u00f4te d'Ivoire\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede\",\"url\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/la-plus-petite-galaxie-connue-decouverte-a-cote-dandromede\",\"name\":\"La plus petite galaxie connue d\u00e9couverte \u00e0 c\u00f4t\u00e9 d'Androm\u00e8de - 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