{"id":9152,"date":"2018-05-27T17:27:36","date_gmt":"2018-05-27T17:27:36","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=9152"},"modified":"2018-06-09T10:06:27","modified_gmt":"2018-06-09T10:06:27","slug":"telescope-cherenkov-a-lobservatoire-de-meudon","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/05\/27\/telescope-cherenkov-a-lobservatoire-de-meudon\/","title":{"rendered":"Un t\u00e9lescope Cherenkov \u00e0 l&#8217;Observatoire de Meudon"},"content":{"rendered":"<p><strong>L&#8217;Observatoire de Meudon a d\u00e9velopp\u00e9\u00a0l\u2019un des prototypes du \u00ab <em>Cherenkov Telescope Array<\/em> \u00bb, un futur grand r\u00e9seau international de t\u00e9lescopes gamma.<\/strong><\/p>\n<p>Certains astres exotiques (comme les\u00a0<a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/astrophysique-pulsar-j2032-nous-offrira-feu-artifice-celeste-2018-58926\/\" target=\"_blank\" rel=\"noopener\">pulsars<\/a>, les trous noirs, les noyaux actifs de galaxies\u2026), \u00e9mettent des rayonnements \u00e0 tr\u00e8s haute \u00e9nergie lors de ph\u00e9nom\u00e8nes cosmiques violents. Ce sont des\u00a0<a href=\"http:\/\/www.futura-sciences.com\/magazines\/espace\/infos\/actu\/d\/sursaut-gamma-derriere-sursaut-gamma-long-cachait-magnetar-59041\/\" target=\"_blank\" rel=\"noopener\">sursauts gamma<\/a>\u00a0dont l\u2019\u00e9nergie se mesure en GeV (Giga-\u00e9lectron-Volt).<\/p>\n\n<!-- iframe plugin v.5.1 wordpress.org\/plugins\/iframe\/ -->\n<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/wKOPgNrKaT4\" frameborder=\"0\" allow=\"autoplay; encrypted-media\" 0=\"allowfullscreen&gt;&lt;\/iframe\" scrolling=\"yes\" class=\"iframe-class\"><\/iframe>\n\n<p>L\u2019arriv\u00e9e dans l\u2019atmosph\u00e8re terrestre de ces rayons gamma produit une cascade de particules dont la lumi\u00e8re bleut\u00e9e (appel\u00e9e lumi\u00e8re Cherenkov) peut \u00eatre capt\u00e9e et analys\u00e9e par des dispositifs particuliers, les\u00a0t\u00e9lescopes \u00e0 imagerie Cherenkov atmosph\u00e9rique.<!--more--><\/p>\n<p>Il existe 3 observatoires d\u2019astronomie gamma\u00a0 :\u00a0<a href=\"http:\/\/veritas.sao.arizona.edu\/\" target=\"_blank\" rel=\"noopener\">VERITAS\u00a0<\/a>(<em>Very Energetic Radiation Imaging Telescope Array System<\/em>) aux USA,\u00a0<a href=\"https:\/\/www.mpi-hd.mpg.de\/hfm\/HESS\/\" target=\"_blank\" rel=\"noopener\">HESS\u00a0<\/a>(<em>High Energy Stereoscopic System<\/em>) en Afrique du Sud et\u00a0<a href=\"https:\/\/magic.mpp.mpg.de\/\" target=\"_blank\" rel=\"noopener\">MAGIC\u00a0<\/a>(<em>Major Atmospheric Gamma-ray Imaging Cherenkov Telescope<\/em>) aux Canaries.<\/p>\n<p>Ce sont les sites de\u00a0l\u2019<a href=\"http:\/\/www.iac.es\/eno.php?op1=2\" target=\"_blank\" rel=\"noopener\">Observatoire du Roque de los Muchachos<\/a>\u00a0\u00e0 La Palma dans les Canaries (Espagne) et celui de\u00a0l\u2019<em>European Southern Observatory<\/em>\u00a0(<a href=\"http:\/\/www.eso.org\/public\/france\/\" target=\"_blank\" rel=\"noopener\">ESO<\/a>) \u00e0 Paranal (Chili) qui vont accueillir les 120 antennes du\u00a0<em>Cherenkov Telescope Array<\/em>\u00a0(<a href=\"https:\/\/portal.cta-observatory.org\/Pages\/Home.aspx\" target=\"_blank\" rel=\"noopener\">CTA<\/a>). Chacun des deux r\u00e9seaux comprendra des antennes de 24, 12 et 6 m de diam\u00e8tre r\u00e9parties sur une aire de 1 km\u00b2\u00a0aux Canaries et de 3 km\u00b2 au Chili.<\/p>\n<p>Le lancement du projet CTA a eu lieu le 9 octobre 2015 sur l\u2019\u00eele de La Palma au Canaries en pr\u00e9sence du Japonais\u00a0<a href=\"http:\/\/www.futura-sciences.com\/magazines\/matiere\/infos\/actu\/d\/physique-nobel-2015-physique-ceux-ont-vu-osciller-neutrinos-60019\/\" target=\"_blank\" rel=\"noopener\">Takaaki Kajita<\/a>, prix Nobel de physique 2015. Depuis novembre 2015 l&#8217;un de ces t\u00e9lescopes (voir la vid\u00e9o ci-dessus) est op\u00e9rationnel \u00e0 l&#8217;<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/05\/26\/lobservatoire-meudon\/\" target=\"_blank\" rel=\"noopener\">Observatoire de Meudon<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>L&#8217;Observatoire de Meudon a d\u00e9velopp\u00e9\u00a0l\u2019un des prototypes du \u00ab Cherenkov Telescope Array \u00bb, un futur grand r\u00e9seau international de t\u00e9lescopes gamma. Certains astres exotiques (comme les\u00a0pulsars, les trous noirs, les noyaux actifs de galaxies\u2026), \u00e9mettent des rayonnements \u00e0 tr\u00e8s haute \u00e9nergie lors de ph\u00e9nom\u00e8nes cosmiques violents. Ce sont des\u00a0sursauts gamma\u00a0dont l\u2019\u00e9nergie se mesure en GeV &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/05\/27\/telescope-cherenkov-a-lobservatoire-de-meudon\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Un t\u00e9lescope Cherenkov \u00e0 l&#8217;Observatoire de Meudon<\/span>  <span class=\"meta-nav\">&rarr;<\/span><\/a><!-- AddThis Advanced Settings generic via filter on get_the_excerpt --><!-- AddThis Share Buttons generic via filter on get_the_excerpt --><\/p>\n","protected":false},"author":8,"featured_media":9153,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[509],"tags":[2509,1299,1300,2108,1203],"class_list":["post-9152","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-actualites","tag-cherenkov","tag-cta","tag-hess","tag-observatoire-de-meudon","tag-sursaut-gamma"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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