{"id":18555,"date":"2022-01-26T19:18:05","date_gmt":"2022-01-26T19:18:05","guid":{"rendered":"https:\/\/www.africa-press.net\/tchad\/politique\/un-trou-noir-inedit-observe-dans-une-galaxie-proche"},"modified":"2022-01-26T20:01:46","modified_gmt":"2022-01-26T20:01:46","slug":"un-trou-noir-inedit-observe-dans-une-galaxie-proche","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/tchad\/toutes-les-actualites\/un-trou-noir-inedit-observe-dans-une-galaxie-proche","title":{"rendered":"Un trou noir in\u00e9dit observ\u00e9 dans une galaxie proche"},"content":{"rendered":"

Africa-Press – Tchad. <\/strong><\/span>Un trou noir de taille interm\u00e9diaire a \u00e9t\u00e9 d\u00e9couvert dans la galaxie d\u2019Androm\u00e8de, selon une r\u00e9cente \u00e9tude. Objet rarement observ\u00e9, il est li\u00e9 \u00e0 l\u2019absorption d\u2019une galaxie plus petite.<\/p>\n

Notre connaissance des trous noirs, d\u00e9j\u00e0 r\u00e9volutionn\u00e9e mi-janvier par les derni\u00e8res trouvailles du t\u00e9lescope Hubble, vient encore de s\u2019\u00e9largir. Un nouvel objet de ce type a en effet \u00e9t\u00e9 d\u00e9couvert dans la galaxie d\u2019Androm\u00e8de, la plus proche de la n\u00f4tre, r\u00e9v\u00e8le une \u00e9tude publi\u00e9e dans la revue The Astrophysical Journal.<\/p>\n

Ce nouveau trou noir intrigue surtout les scientifiques par sa masse. Il est en effet de taille interm\u00e9diaire, c\u2019est-\u00e0-dire plus petit que les trous noirs supermassifs se situant au centre des galaxies, mais plus gros que les fameux trous noirs stellaires, qui se cr\u00e9ent lorsqu\u2019une \u00e9toile s\u2019effondre sur elle-m\u00eame. Une raret\u00e9 donc, quasiment jamais observ\u00e9e, comme l\u2019explique dans un communiqu\u00e9 de l’universit\u00e9 de l’Utah Anil Seth, co-auteur de l’\u00e9tude.<\/p>\n

Restes d\u2019une galaxie plus petite<\/b><\/p>\n

Si ce trou noir est pass\u00e9 si longtemps inaper\u00e7u, c\u2019est qu\u2019il se cachait au sein d\u2019un amas d\u2019\u00e9toiles et a longtemps \u00e9t\u00e9 pris pour un amas globulaire, c\u2019est-\u00e0-dire un agr\u00e9gat tr\u00e8s dense, pouvant contenir une centaine de milliers d’\u00e9toiles.<\/p>\n

Cet assemblage, baptis\u00e9 B023-G078, pourrait en r\u00e9alit\u00e9 constituer les restes d\u2019une galaxie plus petite, absorb\u00e9e par Androm\u00e8de. Il n\u2019en resterait plus qu\u2019un \u00ab\u00a0noyau d\u00e9pouill\u00e9\u00a0\u00bb, ayant perdu ses \u00e9toiles p\u00e9riph\u00e9riques. C\u2019est au centre de ce noyau que les scientifiques ont finalement d\u00e9couvert le trou noir. De quoi infirmer la th\u00e8se de l\u2019amas globulaire.<\/p>\n

Cette d\u00e9couverte a notamment \u00e9t\u00e9 permise par les observations du t\u00e9lescope Hubble. Les scientifiques ont en particulier calcul\u00e9 la vitesse des \u00e9toiles se d\u00e9pla\u00e7ant dans l\u2019ancienne galaxie et en ont conclu \u00e0 l\u2019in\u00e9vitable pr\u00e9sence d\u2019un trou noir.<\/p>\n

Connus pour n\u2019\u00e9mettre aucune lumi\u00e8re et pour parfois surgir lors de la disparition d\u2019un astre, les trous noirs pourraient \u00e9galement leur donner naissance. Mi-janvier, une \u00e9tude avait en effet r\u00e9v\u00e9l\u00e9 que les nuages de gaz lib\u00e9r\u00e9s par ces objets alors supermassifs offraient des conditions optimales \u00e0 l\u2019apparition de nouvelles \u00e9toiles.<\/p>\n

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

Africa-Press – Tchad. Un trou noir de taille interm\u00e9diaire a \u00e9t\u00e9 d\u00e9couvert dans la galaxie d\u2019Androm\u00e8de, selon une r\u00e9cente \u00e9tude. Objet rarement observ\u00e9, il est li\u00e9 \u00e0 l\u2019absorption d\u2019une galaxie plus petite. Notre connaissance des trous noirs, d\u00e9j\u00e0 r\u00e9volutionn\u00e9e mi-janvier par les derni\u00e8res trouvailles du t\u00e9lescope Hubble, vient encore de s\u2019\u00e9largir. Un nouvel objet de […]<\/p>\n","protected":false},"author":82,"featured_media":18554,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,11,10],"tags":[37,292,29],"class_list":["post-18555","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-homepage-french","category-toutes-les-actualites","tag-africa-press","tag-africa-press-tchad","tag-tchad"],"yoast_head":"\nUn trou noir in\u00e9dit observ\u00e9 dans une galaxie proche - tchad<\/title>\n<meta name=\"description\" content=\"Un trou noir de taille interm\u00e9diaire a \u00e9t\u00e9 d\u00e9couvert dans la galaxie d\u2019Androm\u00e8de, selon une r\u00e9cente \u00e9tude. 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