{"id":11908,"date":"2023-04-27T16:06:10","date_gmt":"2023-04-27T16:06:10","guid":{"rendered":"https:\/\/www.africa-press.net\/djibouti\/politique\/les-astronomes-trouvent-lorigine-des-quasars-destinee-probable-de-notre-galaxie"},"modified":"2023-04-27T17:18:50","modified_gmt":"2023-04-27T17:18:50","slug":"les-astronomes-trouvent-lorigine-des-quasars-destinee-probable-de-notre-galaxie","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/les-astronomes-trouvent-lorigine-des-quasars-destinee-probable-de-notre-galaxie","title":{"rendered":"Les astronomes trouvent l’origine des quasars, destin\u00e9e probable de notre galaxie"},"content":{"rendered":"

Africa-Press – Djibouti. <\/strong><\/span>Est-ce le destin de notre galaxie ? Des astronomes ont confirme\u0301 pour la premie\u0300re fois la source des quasars, les objets les plus lumineux de l’Univers a\u0300 l’e\u0301nergie colossale, qui me\u0300nent les galaxies a\u0300 leur perte.<\/p>\n

Le destin de la Voie lacte\u0301e ?<\/b><\/p>\n

Les quasars figurent parmi les entite\u0301s les plus extre\u0302mes de l’Univers, certains brillant autant qu’un milliard de milliards d’e\u0301toiles. Loge\u0301s au coeur des galaxies, ils sont alimente\u0301s par des trous noirs supermassifs, qui, en avalant du gaz, e\u0301mettent un intense rayonnement. Depuis la de\u0301couverte des quasars dans les anne\u0301es 1950, la the\u0301orie dit qu’ils se forment lorsque deux galaxies entrent en collision. Mais fautes de preuves, l’origine de ces mastodontes ce\u0301lestes restait de\u0301battue.<\/p>\n

Une e\u0301quipe internationale d’astronomes affirme avoir trouve\u0301 une \u00ab\u00a0preuve robuste\u00a0\u00bb que les quasars re\u0301sultent bien de la collision de deux galaxies, phe\u0301nome\u0300ne qui libe\u0300re l’immense quantite\u0301 d’e\u0301nergie ne\u0301cessaire. C’est le sort que pourrait connai\u0302tre un jour la Voie lacte\u0301e, avertit Clive Tadhunter, l’un des auteurs de l’e\u0301tude parue le 26 avril 2023 dans Monthly Notices of the Royal Astronomical Society.<\/p>\n

Car la galaxie Androme\u0300de, notre voisine, \u00ab\u00a0se dirige vers nous a\u0300 environ 200 kilome\u0300tres par seconde\u00a0\u00bb, explique a\u0300 l’AFP cet astrophysicien a\u0300 l’Universite\u0301 de Sheffield au Royaume-Uni. A ce rythme, les deux galaxies pourraient se heurter dans quelque 5 milliards d’anne\u0301es, et provoquer un quasar. En repoussant le gaz autour de lui, le quasar empe\u0302che toute nouvelle e\u0301toile de se former, plongeant les galaxies \u00ab\u00a0dans les affres de la mort\u00a0\u00bb, poursuit le chercheur.<\/p>\n

Une observation difficile<\/b><\/p>\n

L’e\u0301tude a compare\u0301 les observations de 48 galaxies logeant des quasars en leur centre a\u0300 celles de 100 galaxies n’en posse\u0301dant pas. Selon les re\u0301sultats, les galaxies ho\u0302tes de quasars e\u0301taient trois fois plus susceptibles que les autres d’avoir e\u0301te\u0301 en collision.<\/p>\n

Si ces preuves ont e\u0301te\u0301 si longues a\u0300 trouver, c’est parce que les te\u0301lescopes utilise\u0301s e\u0301taient optimise\u0301s pour observer les objets au centre des galaxies, mais moins efficaces pour repe\u0301rer les traces d’une collision passe\u0301e – des traces niche\u0301es a\u0300 la pe\u0301riphe\u0301rie des galaxies -, selon Clive Tadhunter. Quand on les observe par exemple avec le te\u0301lescope spatial Hubble, ces structures diffuses apparaissent comme \u00ab\u00a0de\u0301lave\u0301es\u00a0\u00bb, dit-il. Son e\u0301quipe s’est donc appuye\u0301e sur des te\u0301lescopes terrestres, tels que l’observatoire Isaac-Newton sur l’i\u0302le espagnole de La Palma.<\/p>\n

Les quasars sont \u00ab\u00a0comme des balises\u00a0\u00bb dans l’Univers, que le puissant te\u0301lescope spatial James Webb pourrait a\u0300 l’avenir de\u0301tecter jusque dans ses a\u0302ges recule\u0301s, espe\u0300re le scientifique.<\/p>\n

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

Africa-Press – Djibouti. Est-ce le destin de notre galaxie ? Des astronomes ont confirme\u0301 pour la premie\u0300re fois la source des quasars, les objets les plus lumineux de l’Univers a\u0300 l’e\u0301nergie colossale, qui me\u0300nent les galaxies a\u0300 leur perte. Le destin de la Voie lacte\u0301e ? Les quasars figurent parmi les entite\u0301s les plus extre\u0302mes […]<\/p>\n","protected":false},"author":82,"featured_media":11907,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,49,50],"class_list":["post-11908","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-djibouti","tag-djibouti"],"yoast_head":"\nLes astronomes trouvent l'origine des quasars, destin\u00e9e probable de notre galaxie - Djibouti<\/title>\n<meta name=\"description\" content=\"Est-ce le destin de notre galaxie ? 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