{"id":97972,"date":"2025-04-22T15:36:31","date_gmt":"2025-04-22T15:36:31","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/lintrigante-galaxie-du-sombrero-se-devoile-a-loccasion-des-35-ans-du-telescope-hubble"},"modified":"2025-04-22T15:36:31","modified_gmt":"2025-04-22T15:36:31","slug":"lintrigante-galaxie-du-sombrero-se-devoile-a-loccasion-des-35-ans-du-telescope-hubble","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/lintrigante-galaxie-du-sombrero-se-devoile-a-loccasion-des-35-ans-du-telescope-hubble","title":{"rendered":"L’intrigante galaxie du Sombrero se d\u00e9voile, \u00e0 l’occasion des 35 ans du t\u00e9lescope Hubble"},"content":{"rendered":"

Africa-Press – C\u00f4te d’Ivoire. <\/strong><\/span>Aussi large qu\u2019une pleine Lune mais invisible a\u0300 l\u2019\u0153il nu, la galaxie du Sombrero se cache derrie\u0300re un e\u0301pais nuage de poussie\u0300re a\u0300 quelque 35 millions d\u2019anne\u0301es-lumie\u0300re. Mais l’\u0153il aiguise\u0301 du te\u0301lescope spatial Hubble offre une nouvelle photo haute re\u0301solution de cet objet, issue de l’assemblage de plusieurs cliche\u0301s. Elle est pre\u0301sente\u0301e a\u0300 l’occasion du 35e\u0300me anniversaire de l’engin, qui sera ce\u0301le\u0301bre\u0301 le 24 avril 2025.<\/p>\n

Une galaxie hybride<\/b><\/p>\n

Visible avec un petit te\u0301lescope de 200 mm et me\u0302me (plus difficilement) avec une lunette, la galaxie du Sombrero est une cible appre\u0301cie\u0301e des passionne\u0301s d\u2019astronomie. Officiellement nomme\u0301e Messier 104 (M104), elle doit son surnom a\u0300 son apparence: un bulbe central massif surmonte\u0301 d\u2019un disque plat de poussie\u0300res sombres, e\u0301voquant le chapeau mexicain. Vue presque par la tranche depuis la Terre, elle est l\u2019un des rares objets ce\u0301lestes a\u0300 me\u0302ler ainsi les caracte\u0301ristiques de deux grandes familles de galaxies: elle a l’aspect d’une galaxie spirale\u0301e mais son noyau pre\u0301sente une densite\u0301 stellaire typique des galaxies elliptiques.<\/p>\n

Ce profil composite intrigue les astronomes, d\u2019autant plus que cette galaxie, bien qu\u2019abritant un trou noir supermassif de pre\u0300s de 9 milliards de masses solaires, montre peu d\u2019activite\u0301. Son taux de formation stellaire est e\u0301tonnamment bas, infe\u0301rieur a\u0300 une masse solaire par an. Autrement dit, alors que son apparence sugge\u0300re une forte dynamique interne, elle semble en re\u0301alite\u0301 entrer dans une phase calme de son e\u0301volution.<\/p>\n

Une image anniversaire, un nouveau regard<\/b><\/p>\n

Pour produire cette image, les astronomes ont combine\u0301 plusieurs cliche\u0301s pris avec la came\u0301ra ACS de Hubble. Le champ de vision du te\u0301lescope e\u0301tant trop e\u0301troit pour capturer l\u2019ensemble de la galaxie en une seule fois, il a fallu assembler les diffe\u0301rentes observations en une mosai\u0308que de haute pre\u0301cision. Les traitements ont e\u0301galement permis d\u2019augmenter le contraste des bras poussie\u0301reux tout en faisant ressortir les objets d\u2019arrie\u0300re-plan, comme les galaxies plus lointaines visibles en transparence.<\/p>\n

Gra\u0302ce aux donne\u0301es de Hubble, les astronomes ont pu mesurer la quantite\u0301 de me\u0301taux dans cette galaxie et noter la pre\u0301sence d’e\u0301toiles extre\u0302mement riches en me\u0301taux dans le halo qui sugge\u0300re une possible fusion avec une galaxie massive il y a plusieurs milliards d’anne\u0301es. Cette collision galactique pourrait expliquer la dro\u0302le d’allure de la galaxie du Sombrero.<\/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. Aussi large qu\u2019une pleine Lune mais invisible a\u0300 l\u2019\u0153il nu, la galaxie du Sombrero se cache derrie\u0300re un e\u0301pais nuage de poussie\u0300re a\u0300 quelque 35 millions d\u2019anne\u0301es-lumie\u0300re. Mais l’\u0153il aiguise\u0301 du te\u0301lescope spatial Hubble offre une nouvelle photo haute re\u0301solution de cet objet, issue de l’assemblage de plusieurs cliche\u0301s. Elle est […]<\/p>\n","protected":false},"author":82,"featured_media":97971,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37],"class_list":["post-97972","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire-2"],"yoast_head":"\nL'intrigante galaxie du Sombrero se d\u00e9voile, \u00e0 l'occasion des 35 ans du t\u00e9lescope Hubble - 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\/lintrigante-galaxie-du-sombrero-se-devoile-a-loccasion-des-35-ans-du-telescope-hubble\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L'intrigante galaxie du Sombrero se d\u00e9voile, \u00e0 l'occasion des 35 ans du t\u00e9lescope Hubble\" \/>\n<meta property=\"og:description\" content=\"Africa-Press – C\u00f4te d’Ivoire. Aussi large qu\u2019une pleine Lune mais invisible a\u0300 l\u2019\u0153il nu, la galaxie du Sombrero se cache derrie\u0300re un e\u0301pais nuage de poussie\u0300re a\u0300 quelque 35 millions d\u2019anne\u0301es-lumie\u0300re. Mais l’\u0153il aiguise\u0301 du te\u0301lescope spatial Hubble offre une nouvelle photo haute re\u0301solution de cet objet, issue de l’assemblage de plusieurs cliche\u0301s. 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