{"id":13262,"date":"2021-02-08T17:47:43","date_gmt":"2021-02-08T17:47:43","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=13262"},"modified":"2021-02-16T08:30:48","modified_gmt":"2021-02-16T08:30:48","slug":"ce-fuseau-argente-ic-2233-est-une-galaxie-spirale-ultra-mince","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/08\/ce-fuseau-argente-ic-2233-est-une-galaxie-spirale-ultra-mince\/","title":{"rendered":"Ce fuseau argent\u00e9, IC 2233, est une galaxie spirale ultra-mince"},"content":{"rendered":"<p><strong>Encore une galaxie spirale, me direz-vous ? Mais celle que je vous propose aujourd&#8217;hui, IC 2233, est exceptionnellement fine. Voyez plut\u00f4t.\u00a0<\/strong><\/p>\n<h5>Aiguille argent\u00e9e dans une botte de foin cosmique :<\/h5>\n<p>Le bestiaire galactique est d&#8217;une richesse inou\u00efe. La moindre constellation en r\u00e9v\u00e8le un nombre impressionnant de sp\u00e9cimens, pourvu que l&#8217;on dispose du t\u00e9lescope n\u00e9cessaire pour les d\u00e9nicher. Prenez le Lynx, un ast\u00e9risme tr\u00e8s pauvre en \u00e9toiles brillantes. On se tournerait facilement vers sa c\u00e9l\u00e8bre voisine, la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/09\/03\/cest-le-moment-dadmirer-la-constellation-de-la-grande-ourse\/\" target=\"_blank\" rel=\"noopener\">Grande Ourse<\/a>. Et pourtant c&#8217;est dans le Lynx que se trouve la galaxie la plus fine que nous puissions observer.<\/p>\n<figure id=\"attachment_13263\" aria-describedby=\"caption-attachment-13263\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233.jpg\" rel=\"lightbox[13262]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13263\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233-450x269.jpg\" alt=\"\" width=\"450\" height=\"269\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233-450x269.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233-1024x613.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233.jpg 1504w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13263\" class=\"wp-caption-text\">IC 2233 est une galaxie tr\u00e8s fine dans la constellation du Lynx. \u00a9 KPNO\/NOIRLab\/NSF<\/figcaption><\/figure>\n<p>IC 2233 a \u00e9t\u00e9 d\u00e9couverte en 1894 par l&#8217;astronome britannique Isaac Roberts, l&#8217;un des pionniers de la photographie des n\u00e9buleuses. Roberts est pass\u00e9 \u00e0 la post\u00e9rit\u00e9 pour avoir \u00e9t\u00e9 le premier \u00e0 photographier la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/01\/09\/le-telescope-hubble-zoome-sur-la-galaxie-d-andromede\/\" target=\"_blank\" rel=\"noopener\">galaxie d&#8217;Androm\u00e8de<\/a> le 29 d\u00e9cembre 1888.<br \/>\n<!--more--><\/p>\n<h5>R\u00e9gime minceur :<\/h5>\n<p>La galaxie spirale IC 2233 se situe \u00e0 environ 40 millions d&#8217;ann\u00e9es-lumi\u00e8re. Avec sa <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> proche de 13, n&#8217;esp\u00e9rez pas la voir dans une petite <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/12\/10\/longue-vue-bon-choix-debuter-astronomie\/\" target=\"_blank\" rel=\"noopener\">longue-vue<\/a>.\u00a0 Il aura fallu les 4 m\u00e8tres de diam\u00e8tre du t\u00e9lescope Nicholas Mayall de l&#8217;observatoire de Kitt Peak (<a href=\"https:\/\/www.noao.edu\/kpno\/\" target=\"_blank\" rel=\"noopener\">KPNO<\/a>) pour obtenir ce saisissant clich\u00e9. IC 2233 est l&#8217;exemple typique d&#8217;une galaxie ultra-mince o\u00f9 le diam\u00e8tre de la galaxie est au moins dix fois plus grand que son \u00e9paisseur.<\/p>\n<figure id=\"attachment_13264\" aria-describedby=\"caption-attachment-13264\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233carte.jpg\" rel=\"lightbox[13262]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-13264\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233carte-450x293.jpg\" alt=\"\" width=\"450\" height=\"293\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233carte-450x293.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233carte-768x501.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2021\/01\/ic2233carte.jpg 920w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-13264\" class=\"wp-caption-text\">Carte de rep\u00e9rage de la galaxie IC 2233 dans la constellation du Lynx. \u00a9 TheSkyLive<\/figcaption><\/figure>\n<h5>Carte d&#8217;identit\u00e9 :<\/h5>\n<p>Vues par la tranche, ces galaxies se pr\u00e9sentent comme un simple disque d&#8217;\u00e9toiles. Cette orientation les rend fascinantes \u00e0 \u00e9tudier. Une caract\u00e9ristique importante de ce type d&#8217;objets est qu&#8217;ils ont une faible luminosit\u00e9 et presque tous n&#8217;ont aucun renflement. La couleur bleu\u00e2tre trahit la pr\u00e9sence de jeunes \u00e9toiles chaudes et lumineuses, n\u00e9es au sein de nuages \u200b\u200bde gaz interstellaires. On note qu&#8217;\u00e0 la diff\u00e9rence des galaxies spirales typiques, IC 2233 ne montre pas de bande de poussi\u00e8re bien d\u00e9finie. Seules, quelques petites r\u00e9gions sombres peuvent \u00eatre identifi\u00e9es sur les bords de la galaxie.<\/p>\n<h5>Faux compagnon :<\/h5>\n<p>Les astronomes ont cru un temps que IC 2233 \u00e9tait li\u00e9e gravitationnellement \u00e0 NGC 2537. Il s&#8217;agit d&#8217;une autre galaxie du Lynx, une petite spirale hors du champ de cette image. Des observations radio men\u00e9es par le <a href=\"https:\/\/www.futura-sciences.com\/sciences\/photos\/telescope-geant-tour-monde-plus-grands-telescopes-terrestres-1631\/telescope-geant-very-large-array-vla-11749\/\" target=\"_blank\" rel=\"noopener\">VLA <\/a>ont montr\u00e9 que ce n&#8217;\u00e9tait pas le cas, les deux galaxies sont \u00e0 des distances diff\u00e9rentes.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/05\/08\/une-supernova-explose-dans-la-galaxie-spirale-messier-61\/\" target=\"_blank\" rel=\"noopener\">Une supernova explose dans la galaxie spirale Messier 61<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2016\/02\/23\/zoom-sur-ngc-986-une-superbe-galaxie-spirale-barree\/\" target=\"_blank\" rel=\"noopener\">Zoom sur NGC 986, une superbe galaxie spirale barr\u00e9e<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/16\/la-galaxie-ngc-6946-nous-offre-un-tourbillon-stellaire\/\" target=\"_blank\" rel=\"noopener\">La galaxie NGC 6946 nous offre un tourbillon stellaire<\/a><\/li>\n<\/ul>\n<p>Suivez l\u2019actualit\u00e9 astronomique en vous abonnant \u00e0 Cielmania sur\u00a0<a href=\"https:\/\/www.facebook.com\/cielmania\/\" target=\"_blank\" rel=\"noopener noreferrer\">Facebook<\/a>\u00a0ou\u00a0<a href=\"https:\/\/twitter.com\/cielmania\" target=\"_blank\" rel=\"noopener noreferrer\">Twitter<\/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>Encore une galaxie spirale, me direz-vous ? Mais celle que je vous propose aujourd&#8217;hui, IC 2233, est exceptionnellement fine. Voyez plut\u00f4t.\u00a0 Aiguille argent\u00e9e dans une botte de foin cosmique : Le bestiaire galactique est d&#8217;une richesse inou\u00efe. La moindre constellation en r\u00e9v\u00e8le un nombre impressionnant de sp\u00e9cimens, pourvu que l&#8217;on dispose du t\u00e9lescope n\u00e9cessaire pour &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/08\/ce-fuseau-argente-ic-2233-est-une-galaxie-spirale-ultra-mince\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Ce fuseau argent\u00e9, IC 2233, est une galaxie spirale ultra-mince<\/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":13263,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[2934,2962,2963],"class_list":["post-13262","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-du-lynx","tag-ic-2233","tag-isaac-roberts"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Ce fuseau argent\u00e9, IC 2233, est une galaxie spirale ultra-mince<\/title>\n<meta name=\"description\" content=\"Encore une galaxie spirale, me direz-vous ? 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