{"id":1153554,"date":"2020-07-06T18:57:34","date_gmt":"2020-07-06T17:57:34","guid":{"rendered":"https:\/\/www.pressenza.com\/?p=1153554"},"modified":"2020-07-31T16:22:18","modified_gmt":"2020-07-31T15:22:18","slug":"le-plus-grand-radiotelescope-du-monde-detecte-pour-la-premiere-fois-une-emission-dhydrogene-neutre-extragalactique","status":"publish","type":"post","link":"https:\/\/www.pressenza.com\/fr\/2020\/07\/le-plus-grand-radiotelescope-du-monde-detecte-pour-la-premiere-fois-une-emission-dhydrogene-neutre-extragalactique\/","title":{"rendered":"Le plus grand radiot\u00e9lescope du monde d\u00e9tecte pour la premi\u00e8re fois une \u00e9mission d&rsquo;hydrog\u00e8ne neutre extragalactique"},"content":{"rendered":"<p><strong>C&rsquo;est la premi\u00e8re fois que de l&rsquo;hydrog\u00e8ne neutre provenant de l&rsquo;ext\u00e9rieur de la Voie lact\u00e9e a \u00e9t\u00e9 d\u00e9tect\u00e9.<\/strong><\/p>\n<p>Le t\u00e9lescope \u00e0 ouverture sph\u00e9rique (FAST) de 500 m\u00e8tres, <a href=\"https:\/\/actualidad.rt.com\/ultima_hora\/219663-china-estrenar-mayor-radiotelescopio\">situ\u00e9<\/a> dans la province chinoise du Guizhou et consid\u00e9r\u00e9 comme le plus grand de son genre, a d\u00e9tect\u00e9 de l&rsquo;hydrog\u00e8ne neutre provenant de trois galaxies. C&rsquo;est la premi\u00e8re fois que de l&rsquo;hydrog\u00e8ne neutre a \u00e9t\u00e9 d\u00e9tect\u00e9 \u00e0 l&rsquo;ext\u00e9rieur de la Voie lact\u00e9e, une d\u00e9couverte qui pourrait contribuer \u00e0 des \u00e9tudes plus approfondies sur la mati\u00e8re noire.<\/p>\n<p>L&rsquo;\u00e9tude, men\u00e9e par une \u00e9quipe de recherche internationale dirig\u00e9e par Cheng Cheng du Centre d&rsquo;astronomie sud-am\u00e9ricain de l&rsquo;Acad\u00e9mie chinoise des sciences (CASSACA), a \u00e9t\u00e9 <a href=\"https:\/\/www.aanda.org\/articles\/aa\/abs\/2020\/06\/aa38483-20\/aa38483-20.html\">publi\u00e9e<\/a> dans la revue Astronomy &amp; Astrophysics Letters.<\/p>\n<div class=\"Text-root Text-type_5 ArticleView-text ViewText-root \">\n<div class=\"ReadMore-root Section-root Section-is1to3-xs_is1to1\" data-widgets=\"ReadMore\">\n<div class=\"Section-container Section-isRow-isTop-isWrap\">\n<article class=\"Card-root Card-is1to1 \">\n<div class=\"Card-imageWrap\">\n<div class=\"Card-picture\"><picture class=\"Picture-root Picture-default\"><source srcset=\" https:\/\/cdni.rt.com\/actualidad\/public_images\/2020.06\/thumbnail\/5eea5b6fe9ff713b46334bf8.jpg 850w, https:\/\/cdni.rt.com\/actualidad\/public_images\/2020.06\/article\/5eea5b6fe9ff713b46334bf7.jpg 1960w, \" media=\"(-webkit-min-device-pixel-ratio: 2) and (min-resolution: 120dpi)\" sizes=\"280px\" data-srcset=\" https:\/\/cdni.rt.com\/actualidad\/public_images\/2020.06\/thumbnail\/5eea5b6fe9ff713b46334bf8.jpg 850w, https:\/\/cdni.rt.com\/actualidad\/public_images\/2020.06\/article\/5eea5b6fe9ff713b46334bf7.jpg 1960w, \" \/><source srcset=\" https:\/\/cdni.rt.com\/actualidad\/public_images\/2020.06\/thumbnail\/5eea5b6fe9ff713b46334bf8.jpg 460w, https:\/\/cdni.rt.com\/actualidad\/public_images\/2020.06\/article\/5eea5b6fe9ff713b46334bf7.jpg 980w, \" sizes=\"280px\" data-srcset=\" https:\/\/cdni.rt.com\/actualidad\/public_images\/2020.06\/thumbnail\/5eea5b6fe9ff713b46334bf8.jpg 460w, https:\/\/cdni.rt.com\/actualidad\/public_images\/2020.06\/article\/5eea5b6fe9ff713b46334bf7.jpg 980w, \" \/><img decoding=\"async\" class=\"Picture-root Picture-default lazyautosizes lazyloaded\" src=\"https:\/\/cdni.rt.com\/actualidad\/public_images\/2020.06\/thumbnail\/5eea5b6fe9ff713b46334bf8.jpg\" sizes=\"280px\" alt=\"El experimento de detecci\u00f3n de materia oscura registra un n\u00famero anormalmente alto de eventos\" data-sizes=\"auto\" data-src=\"https:\/\/cdni.rt.com\/actualidad\/public_images\/2020.06\/thumbnail\/5eea5b6fe9ff713b46334bf8.jpg\" \/><\/picture><\/div>\n<\/div>\n<\/article>\n<\/div>\n<\/div>\n<p><a href=\"https:\/\/actualidad.rt.com\/actualidad\/356957-experimento-deteccion-materia-oscura-registra\">L&rsquo;exp\u00e9rience de d\u00e9tection de la mati\u00e8re noire enregistre un nombre anormalement \u00e9lev\u00e9 d&rsquo;\u00e9v\u00e9nements.<\/a><\/p>\n<p>L&rsquo;\u00e9quipe a observ\u00e9 quatre galaxies en utilisant le r\u00e9cepteur FAST et a d\u00e9tect\u00e9 l&rsquo;\u00e9mission d&rsquo;hydrog\u00e8ne neutre de trois cibles avec seulement cinq minutes d&rsquo;exposition chacune. M.\u00a0Cheng a d\u00e9clar\u00e9 que l&rsquo;\u00e9quipe a demand\u00e9 plus de temps d&rsquo;observation pour \u00e9tudier plus en d\u00e9tail les propri\u00e9t\u00e9s de l&rsquo;hydrog\u00e8ne neutre.<\/p>\n<p>\u00ab\u00a0Avec les mesures d&rsquo;hydrog\u00e8ne neutre et de monoxyde de carbone, les scientifiques peuvent estimer la masse dynamique des galaxies \u00e0 diff\u00e9rents rayons, et peuvent \u00e9tudier davantage la distribution des baryons [un type de particule subatomique] et de la mati\u00e8re noire\u00a0\u00bb, a d\u00e9clar\u00e9 M. Cheng.<\/p>\n<p>Le gaz hydrog\u00e8ne neutre repr\u00e9sente la classe de baryons la plus r\u00e9pandue dans les galaxies, tandis que le gaz froid trac\u00e9 par le monoxyde de carbone est plus concentr\u00e9 au centre d&rsquo;une galaxie.<\/p>\n<p>Les masses dynamiques de ces quatre galaxies, estim\u00e9es \u00e0 partir de la ligne d&rsquo;hydrog\u00e8ne neutre nouvellement observ\u00e9e, \u00e9taient 10 fois plus \u00e9lev\u00e9es que les masses de baryon observ\u00e9es, ce qui indique la contribution de la mati\u00e8re noire.<\/p>\n<p>&nbsp;<\/p>\n<p><em>Traduction de l\u2019espagnol, Claudie Baudoin<\/em><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>C&rsquo;est la premi\u00e8re fois que de l&rsquo;hydrog\u00e8ne neutre provenant de l&rsquo;ext\u00e9rieur de la Voie lact\u00e9e a \u00e9t\u00e9 d\u00e9tect\u00e9. Le t\u00e9lescope \u00e0 ouverture sph\u00e9rique (FAST) de 500 m\u00e8tres, situ\u00e9 dans la province chinoise du Guizhou et consid\u00e9r\u00e9 comme le plus grand&hellip;<\/p>\n","protected":false},"author":1181,"featured_media":1169780,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[84,495],"tags":[33532,4305,76228,302],"class_list":["post-1153554","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-asia-fr","category-sciences-technologie","tag-astronomie","tag-chine","tag-physique","tag-science"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Le plus grand radiot\u00e9lescope du monde d\u00e9tecte pour la premi\u00e8re fois une \u00e9mission d&#039;hydrog\u00e8ne neutre extragalactique<\/title>\n<meta name=\"description\" content=\"C&#039;est la premi\u00e8re fois que de l&#039;hydrog\u00e8ne neutre provenant de l&#039;ext\u00e9rieur de la Voie lact\u00e9e a \u00e9t\u00e9 d\u00e9tect\u00e9. 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