{"id":1725929,"date":"2023-03-17T22:40:46","date_gmt":"2023-03-17T22:40:46","guid":{"rendered":"https:\/\/www.pressenza.com\/?p=1725929"},"modified":"2023-03-18T13:06:32","modified_gmt":"2023-03-18T13:06:32","slug":"le-telescope-webb-decouvre-deux-galaxies-semblables-a-la-voie-lactee","status":"publish","type":"post","link":"https:\/\/www.pressenza.com\/fr\/2023\/03\/le-telescope-webb-decouvre-deux-galaxies-semblables-a-la-voie-lactee\/","title":{"rendered":"Le t\u00e9lescope Webb d\u00e9couvre deux galaxies semblables \u00e0 la Voie lact\u00e9e"},"content":{"rendered":"

De nouvelles images du t\u00e9lescope spatial James Webb (JWST) r\u00e9v\u00e8lent pour la premi\u00e8re fois des galaxies avec des barres stellaires.<\/em><\/p><\/blockquote>\n

\n

La d\u00e9couverte, l’\u00e9t\u00e9 (dans l\u2019h\u00e9misph\u00e8re nord) dernier, de galaxies dites barr\u00e9es, semblables \u00e0 notre Voie lact\u00e9e si t\u00f4t dans l’univers, obligera les astrophysiciens \u00e0 affiner leurs th\u00e9ories sur l’\u00e9volution des galaxies.<\/p>\n

Avant le JWST, les images du t\u00e9lescope spatial Hubble n’avaient jamais d\u00e9tect\u00e9 de barres \u00e0 des \u00e9poques aussi jeunes.<\/p>\n

J’ai jet\u00e9 un coup d’\u0153il \u00e0 ces donn\u00e9es et j’ai dit : \u00ab\u00a0Laissons tomber tout le reste !\u00a0\u00bb<\/strong>, a d\u00e9clar\u00e9 Shardha Jogee, professeur d’astronomie \u00e0 l’Universit\u00e9 du Texas \u00e0 Austin. \u00ab\u00a0Les barres \u00e0 peine visibles dans les donn\u00e9es de Hubble viennent d’appara\u00eetre dans l’image du JWST, ce qui montre l’\u00e9norme puissance du JWST pour voir la structure sous-jacente des galaxies\u00a0\u00bb<\/strong>, a-t-elle d\u00e9clar\u00e9 dans un communiqu\u00e9<\/a> d\u00e9crivant les donn\u00e9es du Cosmic Evolution Early Release Science Survey<\/em> (CEERS), dirig\u00e9 par le professeur Steven Finkelstein de l’UT Austin.<\/p>\n

L’\u00e9quipe a identifi\u00e9 une autre galaxie barr\u00e9e, EGS-24268, datant \u00e9galement d\u2019il y a environ 11 milliards d’ann\u00e9es, ce qui fait deux galaxies barr\u00e9es qui existent plus loin dans le temps que toutes celles d\u00e9couvertes pr\u00e9c\u00e9demment.<\/p>\n

\"\"Sur les images de Hubble, une galaxie n’est gu\u00e8re plus qu’une tache en forme de disque, mais sur les images du JWST, c’est une belle galaxie spirale avec une barre d’\u00e9toiles claire.<\/figure>\n

Les barres jouent un r\u00f4le important dans l’\u00e9volution des galaxies en canalisant le gaz vers les r\u00e9gions centrales, ce qui favorise la formation d’\u00e9toiles. Les barres aident \u00e9galement les trous noirs supermassifs \u00e0 se d\u00e9velopper au centre des galaxies en canalisant le gaz sur une partie du chemin.<\/p>\n

La d\u00e9couverte de barres \u00e0 des \u00e9poques aussi recul\u00e9es bouleverse les sc\u00e9narios d’\u00e9volution des galaxies \u00e0 plusieurs \u00e9gards.<\/p>\n

JWST peut r\u00e9v\u00e9ler les structures des galaxies lointaines mieux que Hubble pour deux raisons : tout d’abord, son miroir plus grand lui conf\u00e8re une plus grande capacit\u00e9 de collecte de lumi\u00e8re, ce qui lui permet de voir plus loin et avec une meilleure r\u00e9solution. Deuxi\u00e8mement, il peut mieux voir \u00e0 travers la poussi\u00e8re, car il observe \u00e0 de plus grandes longueurs d’ondes infrarouges que Hubble.<\/p>\n

 <\/p>\n

Traduction de l\u2019espagnol, Evelyn Tischer<\/em><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

De nouvelles images du t\u00e9lescope spatial James Webb (JWST) r\u00e9v\u00e8lent pour la premi\u00e8re fois des galaxies avec des barres stellaires. La d\u00e9couverte, l’\u00e9t\u00e9 (dans l\u2019h\u00e9misph\u00e8re nord) dernier, de galaxies dites barr\u00e9es, semblables \u00e0 notre Voie lact\u00e9e si t\u00f4t dans l’univers,…<\/p>\n","protected":false},"author":954,"featured_media":1725933,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40,495],"tags":[111189,111188,75828],"class_list":["post-1725929","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-international-fr","category-sciences-technologie","tag-galaxies","tag-telescope-webb","tag-voie-lactee"],"yoast_head":"\nLe t\u00e9lescope Webb d\u00e9couvre deux galaxies semblables \u00e0 la Voie lact\u00e9e<\/title>\n<meta name=\"description\" content=\"De nouvelles images du t\u00e9lescope spatial James Webb (JWST) r\u00e9v\u00e8lent pour la premi\u00e8re fois des galaxies avec des barres stellaires. 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