{"id":6051,"date":"2016-08-17T14:04:21","date_gmt":"2016-08-17T14:04:21","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=6051"},"modified":"2016-08-27T15:00:35","modified_gmt":"2016-08-27T15:00:35","slug":"abell-2151-jeune-amas-galaxies-hercule","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/08\/17\/abell-2151-jeune-amas-galaxies-hercule\/","title":{"rendered":"Abell 2151, un jeune amas de galaxies dans Hercule"},"content":{"rendered":"<p><strong>Tr\u00f4nant au z\u00e9nith pendant les nuits d&#8217;\u00e9t\u00e9, la discr\u00e8te constellation d&#8217;Hercule rec\u00e8le quelques beaux objets c\u00e9lestes comme l&#8217;amas de galaxies Abell 2151.\u00a0<\/strong><\/p>\n<p>C&#8217;est une plong\u00e9e vertigineuse dans l&#8217;amas de galaxies Abell 2151 (d\u00e9couvert par l&#8217;astronome am\u00e9ricain George Abell d\u00e9c\u00e9d\u00e9 en 1983) que nous offrent\u00a0<a href=\"http:\/\/www.feraphotography.com\/CDK17\/Abell2151.html\" target=\"_blank\">Bob et Janice Fera<\/a>. Dans une superbe image qui a n\u00e9cessit\u00e9 plusieurs heures de poses combin\u00e9es, ils nous entra\u00eenent au c\u0153ur de cet amas de galaxies situ\u00e9 dans la constellation d&#8217;Hercule \u00e0 pr\u00e8s de 500 millions d&#8217;ann\u00e9es-lumi\u00e8re de la Terre.<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/amas_hercule2.jpg\" rel=\"lightbox[6051]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-6053\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/amas_hercule2-450x444.jpg\" alt=\"amas_hercule2\" width=\"450\" height=\"444\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/amas_hercule2-450x444.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/amas_hercule2-768x759.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/amas_hercule2-1024x1011.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2016\/07\/amas_hercule2.jpg 1215w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Abell 2151 est bien diff\u00e9rent des traditionnels amas de galaxies. Il abrite en effet une\u00a0grande vari\u00e9t\u00e9 de types de galaxies, toutes tr\u00e8s jeunes, dont des <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/10\/17\/deux-celebres-galaxies-encadrent-letoile-mirach\/\" target=\"_blank\">galaxies spirales<\/a> riches en gaz o\u00f9 l&#8217;on observe la formation de nouvelles \u00e9toiles. Autre preuve de la jeunesse de cet amas, il ne semble pas contenir de <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/12\/24\/arp-116-un-etrange-couple-de-galaxies-dans-la-vierge\/\" target=\"_blank\">galaxies elliptiques<\/a> g\u00e9antes alors que\u00a0la plupart des galaxies des amas \u00e9volu\u00e9s sont elliptiques ou irr\u00e9guli\u00e8res.<!--more--><\/p>\n<p>Photographi\u00e9 en 2012 par le <a href=\"https:\/\/www.eso.org\/public\/france\/images\/eso1211a\/\" target=\"_blank\">VST <\/a>(un t\u00e9lescope de l&#8217;ESO de 2,6 m\u00e8tres de diam\u00e8tre muni d&#8217;une cam\u00e9ra de 268 m\u00e9gapixels qui le destine aux grands sondages de l&#8217;Univers), Abell 2151 est le fruit de la rencontre d&#8217;au moins trois petits amas de galaxies actuellement en train de fusionner pour former une plus grande structure, qui elle-m\u00eame va se fondre avec d&#8217;autres amas plus grands pour constituer un superamas de galaxies.<\/p>\n<p>Si vous souhaitez admirer cet amas, sachez qu&#8217;un gros t\u00e9lescope vous sera indispensable comme le prouve ce <a href=\"http:\/\/www.astrosurf.com\/astramatoria\/dessin\/ac2151.htm\" target=\"_blank\">dessin d&#8217;Abell 2151<\/a>\u00a0(r\u00e9alis\u00e9 derri\u00e8re l&#8217;oculaire d&#8217;un instrument de 30 centim\u00e8tres de diam\u00e8tre), les principales galaxies de l&#8217;amas se pr\u00e9sentant sous la forme de petites taches floues.<\/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>Tr\u00f4nant au z\u00e9nith pendant les nuits d&#8217;\u00e9t\u00e9, la discr\u00e8te constellation d&#8217;Hercule rec\u00e8le quelques beaux objets c\u00e9lestes comme l&#8217;amas de galaxies Abell 2151.\u00a0 C&#8217;est une plong\u00e9e vertigineuse dans l&#8217;amas de galaxies Abell 2151 (d\u00e9couvert par l&#8217;astronome am\u00e9ricain George Abell d\u00e9c\u00e9d\u00e9 en 1983) que nous offrent\u00a0Bob et Janice Fera. Dans une superbe image qui a n\u00e9cessit\u00e9 plusieurs &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/08\/17\/abell-2151-jeune-amas-galaxies-hercule\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Abell 2151, un jeune amas de galaxies dans Hercule<\/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":6052,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[1744,1754,726,633,1756,1755],"class_list":["post-6051","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-abell-2151","tag-bob-et-janice-fera","tag-constellation-dhercule","tag-eso","tag-george-abell","tag-vst"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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