{"id":19546,"date":"2024-06-28T16:30:06","date_gmt":"2024-06-28T16:30:06","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=19546"},"modified":"2024-07-20T13:34:15","modified_gmt":"2024-07-20T13:34:15","slug":"dans-la-vierge-lenigme-des-galaxies-jumelles","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/06\/28\/dans-la-vierge-lenigme-des-galaxies-jumelles\/","title":{"rendered":"Dans la Vierge, l&#8217;\u00e9nigme des galaxies jumelles"},"content":{"rendered":"<p><strong>L&#8217;immense amas de galaxies nich\u00e9 dans la Vierge compte d&#8217;\u00e9tranges sp\u00e9cimens, comme par exemple les jumelles de NGC 4411.<\/strong><\/p>\n<h5>Une constellation difficile \u00e0 visualiser :<\/h5>\n<p>Coinc\u00e9e entre le\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/05\/23\/en-mai-decouvrez-le-celebre-triplet-de-galaxies-du-lion\/\" target=\"_blank\" rel=\"noopener\">Lion<\/a>\u00a0\u00e0 l\u2019Ouest et la Balance \u00e0 l\u2019Est, la Vierge a une forme peu \u00e9vocatrice. Cette grande constellation (la plus \u00e9tendue apr\u00e8s l\u2019Hydre), n\u2019\u00e9voque gu\u00e8re les grandes d\u00e9esses de l\u2019Antiquit\u00e9 qui y sont associ\u00e9es. Heureusement que sa plus brillante \u00e9toile,\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/11\/18\/venus-aux-cotes-de-letoile-spica-de-la-vierge\/\" target=\"_blank\" rel=\"noopener\">Spica<\/a>, est facilement rep\u00e9rable. C&#8217;est au printemps que la constellation s&#8217;admire une fois la nuit tomb\u00e9e :<\/p>\n<figure id=\"attachment_15869\" aria-describedby=\"caption-attachment-15869\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/nuit_vienne.jpg\" rel=\"lightbox[19546]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-15869\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/nuit_vienne-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/nuit_vienne-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/nuit_vienne-1024x615.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/nuit_vienne-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/05\/nuit_vienne.jpg 1498w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-15869\" class=\"wp-caption-text\">La constellation de la Vierge et ses voisines. \u00a9 Jean-Baptiste Feldmann<\/figcaption><\/figure>\n<p>L\u2019astronome Charles Messier fut le premier \u00e0 y rep\u00e9rer des galaxies qu&#8217;il consigna dans son <a href=\"https:\/\/www.futura-sciences.com\/sciences\/actualites\/astronomie-astronomie-catalogue-messier-250-ans-16597\/\" target=\"_blank\" rel=\"noopener\">c\u00e9l\u00e8bre catalogue<\/a>. Depuis plus de deux si\u00e8cles, les progr\u00e8s en mati\u00e8re d&#8217;imagerie astronomique ne cessent de nous r\u00e9v\u00e9ler des d\u00e9tails dans cette fascinante portion de ciel.<!--more--><\/p>\n<h5>\u00c9tranges jumelles :<\/h5>\n<p>Avec son miroir primaire de quatre m\u00e8tres de diam\u00e8tre, \u00a0le\u00a0<a href=\"https:\/\/noirlab.edu\/public\/programs\/ctio\/victor-blanco-4m-telescope\/\" target=\"_blank\" rel=\"noopener\">t\u00e9lescope Victor M. Blanco<\/a> est l&#8217;instrument id\u00e9al pour explorer les galaxies de la Vierge. L&#8217;une de ses derni\u00e8res images (<a href=\"https:\/\/noirlab.edu\/public\/images\/iotw2421b\/\" target=\"_blank\" rel=\"noopener\"><em>A Galactic Illusion<\/em><\/a>) est tout simplement stup\u00e9fiante. On y d\u00e9couvre un nombre impressionnant de galaxies, de formes et de tailles vari\u00e9es. Spirales, elliptiques, barr\u00e9es, il y en a pour tous les go\u00fbts :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411_large.jpg\" rel=\"lightbox[19546]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-19548\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411_large-450x278.jpg\" alt=\"\" width=\"450\" height=\"278\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411_large-450x278.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411_large-1024x632.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411_large-768x474.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411_large.jpg 1280w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>Mais l&#8217;\u0153il est rapidement attir\u00e9 au centre du clich\u00e9 par un superbe duo : NGC 4411, deux galaxies spirales jumelles. Un seul num\u00e9ro pour deux objets ? Oui, car les instruments disponibles au moment de leur d\u00e9couverte \u00e0 la fin du XIXe si\u00e8cle ne permettaient pas de les d\u00e9doubler. NGC 4411A et B sont situ\u00e9es \u00e0 environ 50 millions d&#8217;<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-annee-lumiere-17\/\" target=\"_blank\" rel=\"noopener\">ann\u00e9es-lumi\u00e8re<\/a> toutes les deux. Une similitude de distance qui pourrait l\u00e9gitimement faire croire que ces deux galaxies sont reli\u00e9es gravitationnellement. Pourtant, on ne distingue aucune trace de ce lien : pas de courant stellaire, pas de d\u00e9formation des galaxies. Tout le contraire de ce que l&#8217;on observe par exemple avec NGC 4410 en haut de l&#8217;image. Les astronomes n&#8217;ont pour l&#8217;instant pas de r\u00e9ponse \u00e0 cette bizarrerie cosmique. Contentons-nous donc de savourer visuellement le r\u00e9sultat :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411.jpg\" rel=\"lightbox[19546]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-19547\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/ngc4411.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li style=\"list-style-type: none\">\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/01\/13\/plongee-dans-hickson-44-un-superbe-groupe-de-galaxies\/\" target=\"_blank\" rel=\"noopener\">Plong\u00e9e dans Hickson 44, un superbe groupe de galaxies<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2023\/11\/17\/chasse-galactique-entre-le-cobra-et-la-souris\/\" target=\"_blank\" rel=\"noopener\">Chasse galactique entre le Cobra et la Souris<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/04\/29\/les-somptueuses-galaxies-de-ralph-copeland\/\" target=\"_blank\" rel=\"noopener\">Les somptueuses galaxies de Ralph Copeland<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/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;immense amas de galaxies nich\u00e9 dans la Vierge compte d&#8217;\u00e9tranges sp\u00e9cimens, comme par exemple les jumelles de NGC 4411. Une constellation difficile \u00e0 visualiser : Coinc\u00e9e entre le\u00a0Lion\u00a0\u00e0 l\u2019Ouest et la Balance \u00e0 l\u2019Est, la Vierge a une forme peu \u00e9vocatrice. Cette grande constellation (la plus \u00e9tendue apr\u00e8s l\u2019Hydre), n\u2019\u00e9voque gu\u00e8re les grandes d\u00e9esses de &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/06\/28\/dans-la-vierge-lenigme-des-galaxies-jumelles\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Dans la Vierge, l&#8217;\u00e9nigme des galaxies jumelles<\/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":19547,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[113,112,3590],"class_list":["post-19546","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-de-la-vierge","tag-galaxie","tag-ngc-4411"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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