{"id":95096,"date":"2025-02-13T16:48:24","date_gmt":"2025-02-13T16:48:24","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/un-anneau-deinstein-presque-parfait-observe-par-euclid"},"modified":"2025-02-13T16:48:24","modified_gmt":"2025-02-13T16:48:24","slug":"un-anneau-deinstein-presque-parfait-observe-par-euclid","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/un-anneau-deinstein-presque-parfait-observe-par-euclid","title":{"rendered":"Un anneau d\u2019Einstein presque parfait observ\u00e9 par Euclid"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>Les lentilles gravitationnelles, pre\u0301dictions directes de la relativite\u0301 ge\u0301ne\u0301rale, sont des outils cle\u0301s pour explorer la distribution de la matie\u0300re noire dans l\u2019Univers. En septembre 2023, le te\u0301lescope spatial Euclid a de\u0301tecte\u0301 l\u2019un de ces phe\u0301nome\u0300nes sous la forme d\u2019un anneau d\u2019Einstein presque parfait, a\u0300 l&rsquo;inte\u0301rieur de la galaxie NGC 6505, situe\u0301e a\u0300 590 millions d&rsquo;anne\u0301es-lumie\u0300re de la Terre.<\/p>\n<p><b>Une lentille gravitationnelle forte<\/b><\/p>\n<p>Les observations du te\u0301lescope Euclid, conc\u0327u par l\u2019Agence spatiale europe\u0301enne pour explorer la distribution de la matie\u0300re noire et de l\u2019e\u0301nergie noire, ont permis d\u2019identifier cet anneau d\u2019Einstein lors des premiers essais des instruments de l&rsquo;engin lance\u0301 quelques mois plus to\u0302t. Les anneaux sont des phe\u0301nome\u0300nes extre\u0302mement rares qui se forment lorsque la lentille gravitationnelle est parfaitement aligne\u0301e avec l&rsquo;objet qu&rsquo;elle amplifie (voir sche\u0301ma ci-dessous).<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"254\" class=\"alignnone wp-image-95093 size-full\" src=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/02\/sm_1739457167.633017.jpg\" srcset=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/02\/sm_1739457167.633017.jpg 453w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/02\/sm_1739457167.633017-300x168.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><\/p>\n<p>Dans ce cas pre\u0301cis, la galaxie lentille NGC 6505 a courbe\u0301 la lumie\u0300re d\u2019une galaxie beaucoup plus lointaine, a\u0300 4,42 milliards d\u2019anne\u0301es-lumie\u0300re. Ce phe\u0301nome\u0300ne n\u2019avait jamais e\u0301te\u0301 de\u0301tecte\u0301 autour de cette galaxie pourtant bien documente\u0301e. Selon Conor O\u2019Riordan, de l\u2019Institut Max Planck pour l\u2019astrophysique, cette configuration fournit une occasion unique d\u2019e\u0301tudier en de\u0301tail les effets gravitationnels induits par la matie\u0300re noire. En effet, en analysant l&rsquo;image les astrophysiciens peuvent estimer la masse de la lentille et examiner la distribution de la matie\u0300re sombre qui l&rsquo;entoure.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"453\" class=\"alignnone wp-image-95094 size-full\" src=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/02\/sm_1739457169.651756.jpg\" srcset=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/02\/sm_1739457169.651756.jpg 453w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/02\/sm_1739457169.651756-300x300.jpg 300w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/02\/sm_1739457169.651756-150x150.jpg 150w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Un outil cle\u0301 pour comprendre la matie\u0300re noire et l\u2019e\u0301nergie noire<\/b><\/p>\n<p>La de\u0301couverte re\u0301alise\u0301e par Euclid montre que l\u2019instrumentation du te\u0301lescope est bien adapte\u0301e a\u0300 la de\u0301tection de ces lentilles gravitationnelles qui, bien que spectaculaires, ne sont pas son objectif principal. En effet, Euclid a e\u0301te\u0301 conc\u0327u pour analyser les effets plus diffus des lentilles gravitationnelles faibles, qui modifient le\u0301ge\u0300rement la forme des galaxies en arrie\u0300re-plan sur de grandes e\u0301chelles. En combinant ces observations avec celles d\u2019autres projets comme DESI ou LSST, les chercheurs espe\u0300rent mieux comprendre la nature de l\u2019e\u0301nergie noire, responsable de l\u2019acce\u0301le\u0301ration de l\u2019expansion de l\u2019Univers.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">C\u00f4te d&rsquo;Ivoire<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<span style=\"color: #ff6600\"><\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Les lentilles gravitationnelles, pre\u0301dictions directes de la relativite\u0301 ge\u0301ne\u0301rale, sont des outils cle\u0301s pour explorer la distribution de la matie\u0300re noire dans l\u2019Univers. En septembre 2023, le te\u0301lescope spatial Euclid a de\u0301tecte\u0301 l\u2019un de ces phe\u0301nome\u0300nes sous la forme d\u2019un anneau d\u2019Einstein presque parfait, a\u0300 l&rsquo;inte\u0301rieur de la galaxie NGC 6505, [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":95095,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37],"class_list":["post-95096","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire-2"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Un anneau d\u2019Einstein presque parfait observ\u00e9 par Euclid - C\u00f4te d&#039;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\/un-anneau-deinstein-presque-parfait-observe-par-euclid\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un anneau d\u2019Einstein presque parfait observ\u00e9 par Euclid\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Les lentilles gravitationnelles, pre\u0301dictions directes de la relativite\u0301 ge\u0301ne\u0301rale, sont des outils cle\u0301s pour explorer la distribution de la matie\u0300re noire dans l\u2019Univers. En septembre 2023, le te\u0301lescope spatial Euclid a de\u0301tecte\u0301 l\u2019un de ces phe\u0301nome\u0300nes sous la forme d\u2019un anneau d\u2019Einstein presque parfait, a\u0300 l&rsquo;inte\u0301rieur de la galaxie NGC 6505, [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/un-anneau-deinstein-presque-parfait-observe-par-euclid\" \/>\n<meta property=\"og:site_name\" content=\"C\u00f4te d&#039;Ivoire\" \/>\n<meta property=\"article:published_time\" content=\"2025-02-13T16:48:24+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/02\/sm_1739457167.633017.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"453\" \/>\n\t<meta property=\"og:image:height\" content=\"254\" \/>\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=\"2 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\/un-anneau-deinstein-presque-parfait-observe-par-euclid#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/un-anneau-deinstein-presque-parfait-observe-par-euclid\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Un anneau d\u2019Einstein presque parfait observ\u00e9 par Euclid\",\"datePublished\":\"2025-02-13T16:48:24+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/un-anneau-deinstein-presque-parfait-observe-par-euclid\"},\"wordCount\":421,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/un-anneau-deinstein-presque-parfait-observe-par-euclid#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/02\/sm_1739457171.965504.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\/un-anneau-deinstein-presque-parfait-observe-par-euclid#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/un-anneau-deinstein-presque-parfait-observe-par-euclid\",\"url\":\"https:\/\/www.africa-press.net\/cotedivoire\/politique\/un-anneau-deinstein-presque-parfait-observe-par-euclid\",\"name\":\"Un anneau d\u2019Einstein presque parfait observ\u00e9 par Euclid - 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