{"id":96583,"date":"2025-03-21T16:00:52","date_gmt":"2025-03-21T16:00:52","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/26-millions-de-galaxies-devoilees-par-les-premieres-donnees-de-la-mission-euclid"},"modified":"2025-03-21T16:00:52","modified_gmt":"2025-03-21T16:00:52","slug":"26-millions-de-galaxies-devoilees-par-les-premieres-donnees-de-la-mission-euclid","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/26-millions-de-galaxies-devoilees-par-les-premieres-donnees-de-la-mission-euclid","title":{"rendered":"26 millions de galaxies d\u00e9voil\u00e9es par les premi\u00e8res donn\u00e9es de la mission Euclid"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>Le nouveau jeu de donne\u0301es scientifiques de la mission europe\u0301enne Euclid rendu public ce 19 mars 2025 offre un spectaculaire aperc\u0327u des tre\u0300s grandes capacite\u0301s du te\u0301lescope spatial. Depuis sa mise en service le 14 fe\u0301vrier 2024, il a observe\u0301 trois re\u0301gions du ciel qui couvrent 63 degre\u0301s carre\u0301s \u2013 une superficie e\u0301quivalant a\u0300 plus de 300 fois celle de la Lune \u2013 fournissant ainsi trois premie\u0300res mosai\u0308ques d\u2019images. Si ces donne\u0301es ne repre\u0301sentent que 0,45% des observations pre\u0301vues pour les prochaines anne\u0301es, puisqu\u2019Euclid doit scruter environ un tiers de la vou\u0302te ce\u0301leste, soit 14.000 degre\u0301s carre\u0301s, leur analyse est de\u0301ja\u0300 a\u0300 l\u2019origine d\u2019une se\u0301rie de 27 articles d\u2019astrophysique et 7 autres publications techniques lie\u0301es au traitement de ces donne\u0301es.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"453\" class=\"alignnone wp-image-96578 size-full\" src=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560631.099753.jpg\" srcset=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560631.099753.jpg 453w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560631.099753-300x300.jpg 300w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560631.099753-150x150.jpg 150w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Chaque champ profond sera observe\u0301 entre 30 et 52 fois<\/b><\/p>\n<p>Le consortium Euclid, dans lequel sont implique\u0301es quelque 2600 personnes d\u2019une vingtaine de nationalite\u0301s, a ainsi identifie\u0301 les trois re\u0301gions ou\u0300 seront re\u0301alise\u0301es ses observations les plus approfondies \u2013 les \u00ab\u00a0champs profonds\u00a0\u00bb qui doivent permettre de mesurer l\u2019influence de l\u2019e\u0301nergie noire au cours de l\u2019e\u0301volution de l\u2019Univers, le sujet principal de la mission. De\u0300s ce premier passage sur chaque zone, Euclid a tout de me\u0302me de\u0301ja\u0300 recense\u0301 26 millions de galaxies, dont les plus lointaines e\u0301voluent a\u0300 10,5 milliards d\u2019anne\u0301es-lumie\u0300re, et une poigne\u0301e de quasars situe\u0301s a\u0300 des distances encore plus grandes. Pendant les six ans que doit durer la mission, chaque champ profond sera observe\u0301 entre 30 et 52 fois, re\u0301ve\u0301lant toujours plus de galaxies distantes.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"254\" class=\"alignnone wp-image-96579 size-full\" src=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560633.567862.jpg\" srcset=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560633.567862.jpg 453w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560633.567862-300x168.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><\/p>\n<p>Euclid dispose d\u2019instruments d&rsquo;imagerie a\u0300 haute re\u0301solution dans le visible (VIS) et dans le proche infrarouge (NISP) qui enregistrent pour le premier la varie\u0301te\u0301 des formes et la distribution spatiale de milliards de galaxies, tandis que le second mesure leurs distances et leurs masses. Ces capacite\u0301s, applique\u0301es de\u0301ja\u0300 sur des centaines de milliers de galaxies, re\u0301ve\u0300lent l\u2019organisation a\u0300 grande e\u0301chelle de ces objets dans les filaments de matie\u0300re ordinaire et de matie\u0300re noire qui composent la toile cosmique. C\u2019est seulement a\u0300 l\u2019e\u0301chelle de cette structure complexe et a\u0300 la fin du releve\u0301 complet d\u2019Euclid que l\u2019on peut espe\u0301rer comprendre ce que sont les myste\u0301rieuses matie\u0300re noire et e\u0301nergie noire, qui repre\u0301sentent environ 95 % du cosmos.<\/p>\n<p><b>Des milliers de \u00ab\u00a0petits points rouges\u00a0\u00bb myste\u0301rieux<\/b><\/p>\n<p>Au nombre des diverses de\u0301couvertes e\u0301grene\u0301es dans ces articles, l\u2019e\u0301tude mene\u0301e par Ce\u0301line Gouin, de l\u2019Institut d\u2019astrophysique de Paris (IAP), montre que plus un amas de galaxies est massif, plus il est connecte\u0301 a\u0300 des filaments de la toile cosmique, une connexion qui influence la morphologie de ses galaxies, puisqu\u2019on y trouve plus de galaxies elliptiques. De leur co\u0302te\u0301, l\u2019e\u0301quipe dirige\u0301e par Clotilde Laigle, astronome a\u0300 l\u2019IAP, a montre\u0301 que \u00ab\u00a0les galaxies les plus anciennes, elliptiques, sont observe\u0301es plus pre\u0300s des c\u0153urs des filaments cosmiques que les galaxies a\u0300 disques, et par conse\u0301quent sont davantage sujettes aux interactions, qui peuvent e\u0302tre a\u0300 l&rsquo;origine de leur transformation morphologique\u00a0\u00bb, de\u0301clarent Clotilde Laigle dans un communique\u0301 diffuse\u0301 par le consortium. Les elliptiques sont e\u0301galement plus aligne\u0301es avec la direction de leur filament, ce qui va dans le sens d&rsquo;autres mesures observationnelles a\u0300 des a\u0302ges de l&rsquo;Univers plus re\u0301cents.\u00a0\u00bb<\/p>\n<p>Les chercheurs ont aussi pu identifier des milliers de nouveaux \u00ab\u00a0petits points rouges\u00a0\u00bb. De\u0301couverts il y a seulement trois ans par le te\u0301lescope James Webb de la Nasa, ces objets de l&rsquo;Univers primitif sont a\u0300 ce stade des myste\u0300res.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"254\" class=\"alignnone wp-image-96580 size-full\" src=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560635.754354.jpg\" srcset=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560635.754354.jpg 453w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560635.754354-300x168.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><br \/>\n<b>Euclid devrait identifier pre\u0300s de 100.000 lentilles gravitationnelles<\/b><\/p>\n<p>L\u2019intelligence artificielle (IA) et les sciences participatives ont par ailleurs e\u0301te\u0301 associe\u0301es ces derniers mois en vue de dresser un catalogue classifiant plus de 380.000 galaxies et 500 candidats lentilles gravitationnelles presque totalement ine\u0301dites. Jusque-la\u0300, nous ne connaissions qu\u2019environ 150 exemples de ce phe\u0301nome\u0300ne optique, qui permet de de\u0301celer la pre\u0301sence de matie\u0300re noire ou de galaxies invisibles entre la source de lumie\u0300re lointaine et celle qui la de\u0301fle\u0301chit a\u0300 l\u2019avant-plan, selon les lois de la relativite\u0301 ge\u0301ne\u0301rale d\u2019Einstein. A\u0300 terme, Euclid devrait identifier pre\u0300s de 100.000 lentilles gravitationnelles !<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"453\" height=\"254\" class=\"alignnone wp-image-96581 size-full\" src=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560637.795576.jpg\" srcset=\"https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560637.795576.jpg 453w, https:\/\/static.africa-press.net\/cote\/sites\/43\/2025\/03\/sm_1742560637.795576-300x168.jpg 300w\" sizes=\"auto, (max-width: 453px) 100vw, 453px\" \/><\/p>\n<p>Pendant six ans, Euclid va produire chaque jour quelque 100 gigaoctets de donne\u0301es. Un volume colossal qui ne pourra e\u0302tre traite\u0301 qu\u2019a\u0300 l\u2019aide d\u2019algorithmes d\u2019intelligence artificielle, entrai\u0302ne\u0301s par des milliers d\u2019humains. Pour cela, deux campagnes de sciences participatives ont e\u0301te\u0301 initie\u0301es en 2024 sur la plateforme Zooniverse: les participants doivent aider les algorithmes a\u0300 distinguer les diffe\u0301rentes morphologies des galaxies et a\u0300 repe\u0301rer les lentilles gravitationnelles. Plusieurs centaines de milliers de classifications plus tard, ces IA sont plus efficaces et de\u0301sormais de\u0301ploye\u0301es dans la chai\u0302ne de traitement des donne\u0301es d\u2019Euclid.<\/p>\n<p>Ces premie\u0300res publications portant sur des domaines annexes au c\u0153ur de la mission Euclid &#8211; de\u0301die\u0301e a\u0300 la compre\u0301hension de l\u2019e\u0301nergie et la matie\u0300re noire \u2013 de\u0301montrent surtout le potentiel de l\u2019outil. La ve\u0301ritable premie\u0300re e\u0301che\u0301ance de la mission est octobre 2026, lorsque seront communique\u0301es les premie\u0300res donne\u0301es ve\u0301ritablement cosmologiques. La fin de la campagne d\u2019observations initiale d\u2019Euclid est pre\u0301vue pour 2031.<\/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. Le nouveau jeu de donne\u0301es scientifiques de la mission europe\u0301enne Euclid rendu public ce 19 mars 2025 offre un spectaculaire aperc\u0327u des tre\u0300s grandes capacite\u0301s du te\u0301lescope spatial. Depuis sa mise en service le 14 fe\u0301vrier 2024, il a observe\u0301 trois re\u0301gions du ciel qui couvrent 63 degre\u0301s carre\u0301s \u2013 une [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":96582,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[37],"class_list":["post-96583","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>26 millions de galaxies d\u00e9voil\u00e9es par les premi\u00e8res donn\u00e9es de la mission 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\/26-millions-de-galaxies-devoilees-par-les-premieres-donnees-de-la-mission-euclid\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"26 millions de galaxies d\u00e9voil\u00e9es par les premi\u00e8res donn\u00e9es de la mission Euclid\" \/>\n<meta property=\"og:description\" content=\"Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. 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Le nouveau jeu de donne\u0301es scientifiques de la mission europe\u0301enne Euclid rendu public ce 19 mars 2025 offre un spectaculaire aperc\u0327u des tre\u0300s grandes capacite\u0301s du te\u0301lescope spatial. 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