{"id":19637,"date":"2024-12-13T16:55:04","date_gmt":"2024-12-13T16:55:04","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=19637"},"modified":"2025-01-08T16:49:38","modified_gmt":"2025-01-08T16:49:38","slug":"ngc-3981-la-galaxie-spirale-qui-perd-ses-bras","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/12\/13\/ngc-3981-la-galaxie-spirale-qui-perd-ses-bras\/","title":{"rendered":"NGC 3981, la galaxie spirale qui perd ses bras"},"content":{"rendered":"<p><strong>La discr\u00e8te constellation de la Coupe h\u00e9berge NGC 3981, une galaxie spirale qui a connu un profond bouleversement.\u00a0<\/strong><\/p>\n<h5>Une galaxie dans la Coupe :<\/h5>\n<p>NGC 3981 est encore une d\u00e9couverte \u00e0 mettre \u00e0 l&#8217;actif de l&#8217;astronome <a href=\"https:\/\/www.futura-sciences.com\/sciences\/personnalites\/astronomie-william-herschel-521\/\" target=\"_blank\" rel=\"noopener\">William Herschel<\/a> en 1785. Cette curieuse <a href=\"https:\/\/astronomes.com\/galaxie\/type-galaxie\/\" target=\"_blank\" rel=\"noopener\">galaxie spirale<\/a> se situe dans la Coupe, petite constellation plac\u00e9e sous la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/05\/20\/des-milliers-de-galaxies-se-cachent-dans-la-vierge\/\" target=\"_blank\" rel=\"noopener\">Vierge<\/a> et le <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>. Dans la mythologie grecque, cette Coupe aurait pu \u00eatre celle d&#8217;Apollon, de Dionysos ou encore de Salomon. Mais revenons \u00e0 notre galaxie : situ\u00e9e \u00e0 100 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>, elle offre une modeste <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> de 11. Autant dire que William Herschel ne voyait qu&#8217;une petite tache floue dans son t\u00e9lescope. Pour en d\u00e9couvrir toute la splendeur, il faut la photographier avec un grand instrument :<\/p>\n<p><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/NGC3981.jpg\" rel=\"lightbox[19637]\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-19638\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/NGC3981-450x271.jpg\" alt=\"\" width=\"450\" height=\"271\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/NGC3981-450x271.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/NGC3981-1024x616.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/NGC3981-768x462.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2024\/06\/NGC3981.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><\/p>\n<p>L&#8217;image propos\u00e9e par <a href=\"https:\/\/noirlab.edu\/public\/images\/iotw2425a\/\" target=\"_blank\" rel=\"noopener\">NOIRLab<\/a> a \u00e9t\u00e9 r\u00e9alis\u00e9e \u00e0 l&#8217;aide du t\u00e9lescope Blanco. Elle r\u00e9v\u00e8le une galaxie spirale dont les bras ont \u00e9t\u00e9 arrach\u00e9s au noyau, probable r\u00e9sultat d&#8217;une lointaine rencontre cosmique entre NGC 3981 et une autre galaxie. De telles collisions laissent la place \u00e0 de curieux objets c\u00e9lestes, comme par exemple <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/01\/22\/arp-243-beau-resultat-de-deux-galaxies-collision\/\" target=\"_blank\" rel=\"noopener\">Arp 243<\/a>. Certains astrophotographes amateurs lui ont \u00e9galement tir\u00e9 le portrait, comme <a href=\"https:\/\/www.aapod2.com\/blog\/ngc-3981\" target=\"_blank\" rel=\"noopener\">Bernard Miller<\/a>.<\/p>\n<p><!--more--><\/p>\n<h5>Sous le ciel du Chili :<\/h5>\n<p>Le t\u00e9lescope Blanco est le fleuron du \u00a0CTIO (<em>Cerro Tololo Inter-American Observatory<\/em>). Cet instrument dot\u00e9 d\u2019un miroir de 4 m\u00e8tres de diam\u00e8tre porte le nom de l\u2019astronome portoricain Victor Manuel Blanco. Le t\u00e9lescope est \u00e9quip\u00e9 d\u2019une tr\u00e8s puissante cam\u00e9ra, la DEC, dot\u00e9e de 570 millions de pixels. La <em>Dark-Energy Camera<\/em> est capable de capturer 100.000 galaxies jusqu\u2019\u00e0 8 milliards d\u2019ann\u00e9es-lumi\u00e8re en une seule pose.<\/p>\n<figure id=\"attachment_13217\" aria-describedby=\"caption-attachment-13217\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/kpno.jpg\" rel=\"lightbox[19637]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-13217 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/kpno-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/kpno-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/12\/kpno.jpg 700w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13217\" class=\"wp-caption-text\">L\u2019Observatoire interam\u00e9ricain du Cerro Tololo domine la Cordill\u00e8re des Andes. \u00a9 KPNO<\/figcaption><\/figure>\n<p>Comme son nom l&#8217;indique, cette cam\u00e9ra (maintenue sous vide \u00e0 une temp\u00e9rature de -150\u00b0 C) est d\u00e9di\u00e9e \u00e0 la traque de <a href=\"https:\/\/www.cea.fr\/comprendre\/Pages\/matiere-univers\/essentiel-sur-energie-noire.aspx\" target=\"_blank\" rel=\"noopener\">l\u2019\u00e9nergie noire<\/a>. Elle a son \u00e9quivalent dans l&#8217;h\u00e9misph\u00e8re Nord : c&#8217;est l&#8217;instrument <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/08\/19\/desi-un-nouvel-instrument-va-traquer-lenergie-noire\/\" target=\"_blank\" rel=\"noopener noreferrer\">DESI<\/a>, install\u00e9 au <em>Kitt Peak National Observatory <\/em>(KPNO) en Arizona.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/04\/18\/leso-fete-les-50-ans-de-son-observatoire-de-la-silla\/\" target=\"_blank\" rel=\"noopener\">L\u2019ESO f\u00eate les 50 ans de son observatoire de La Silla<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2018\/11\/25\/a-dijon-la-belle-renaissance-dun-observatoire-oublie\/\" target=\"_blank\" rel=\"noopener\">\u00c0 Dijon, la belle renaissance d\u2019un observatoire oubli\u00e9<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/01\/17\/vlt-observatoire-desert-atacama\/\" target=\"_blank\" rel=\"noopener\">Le VLT, un observatoire au c\u0153ur du d\u00e9sert d\u2019Atacama<\/a><\/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>\u00a0et sur\u00a0<a href=\"https:\/\/bsky.app\/profile\/cielmania.bsky.social\" target=\"_blank\" rel=\"noopener\">Bluesky<\/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>La discr\u00e8te constellation de la Coupe h\u00e9berge NGC 3981, une galaxie spirale qui a connu un profond bouleversement.\u00a0 Une galaxie dans la Coupe : NGC 3981 est encore une d\u00e9couverte \u00e0 mettre \u00e0 l&#8217;actif de l&#8217;astronome William Herschel en 1785. Cette curieuse galaxie spirale se situe dans la Coupe, petite constellation plac\u00e9e sous la Vierge &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/12\/13\/ngc-3981-la-galaxie-spirale-qui-perd-ses-bras\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">NGC 3981, la galaxie spirale qui perd ses bras<\/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":19638,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3595,1229,3594,3026,2710],"class_list":["post-19637","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-de-la-coupe","tag-galaxie-spirale","tag-ngc-3981","tag-noirlab","tag-telescope-blanco"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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