{"id":18493,"date":"2024-02-22T09:15:12","date_gmt":"2024-02-22T09:15:12","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=18493"},"modified":"2024-03-06T17:28:08","modified_gmt":"2024-03-06T17:28:08","slug":"la-belle-galaxie-australe-ngc-55-voit-rouge","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/02\/22\/la-belle-galaxie-australe-ngc-55-voit-rouge\/","title":{"rendered":"La belle galaxie australe NGC 55 voit rouge"},"content":{"rendered":"<p><strong>L&#8217;APO (<em>Atacama Photographic Observatory<\/em>) a immortalis\u00e9 NGC 55, une galaxie irr\u00e9guli\u00e8re vue par la tranche dans la constellation du Sculpteur.<\/strong><\/p>\n<h5>Cap sur le ciel austral :<\/h5>\n<p>La galaxie NGC 55 (<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/05\/06\/quest-lechelle-magnitudes-astronomie\/\" target=\"_blank\" rel=\"noopener\">magnitude<\/a> 8) a \u00e9t\u00e9 d\u00e9couverte par l&#8217;astronome \u00e9cossais James Dunlop en 1826. Elle est situ\u00e9e \u00e0 6 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> dans le Sculpteur (tout comme la <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/11\/01\/feu-dartifice-dans-la-galaxie-de-la-roue-de-chariot\/\" target=\"_blank\" rel=\"noopener\">Roue de chariot<\/a>), une modeste constellation du ciel austral. Si vous n&#8217;avez pas la possibilit\u00e9 d&#8217;aller l&#8217;observer depuis l&#8217;h\u00e9misph\u00e8re Sud, vous pouvez admirer les images propos\u00e9es par l&#8217;<a href=\"http:\/\/www.atacama-photographic-observatory.com\/\" target=\"_blank\" rel=\"noopener\">APO<\/a>. Elles sont l&#8217;\u0153uvre de Thierry Demange, Richard Galli et Thomas Petit. Depuis 2014, ces trois amateurs alsaciens pilotent \u00e0 distance une lunette astronomique de 150 mm de diam\u00e8tre install\u00e9e en plein d\u00e9sert d\u2019Atacama au Chili :<\/p>\n<figure id=\"attachment_18494\" aria-describedby=\"caption-attachment-18494\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/NGC55_Ha.jpg\" rel=\"lightbox[18493]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18494 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/NGC55_Ha-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/NGC55_Ha-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/NGC55_Ha-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/NGC55_Ha-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/09\/NGC55_Ha.jpg 1502w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18494\" class=\"wp-caption-text\">La galaxie australe NGC 55. \u00a9 Atacama Photographic Observatory<\/figcaption><\/figure>\n<p>Pour obtenir cette superbe image de NGC 55 (cinquante-cinqui\u00e8me entr\u00e9e du <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-ngc-6380\/\" target=\"_blank\" rel=\"noopener\"><em>New General Catalogue<\/em><\/a>), ils ont accumul\u00e9 plus de vingt heures de poses. Mais la moiti\u00e9 du temps de prises de vues s&#8217;est fait en H alpha, une raie d\u2019\u00e9mission de l\u2019atome d\u2019hydrog\u00e8ne.<!--more--><\/p>\n<h5>Hydrog\u00e8ne ionis\u00e9 :<\/h5>\n<p>Sur les images astronomiques, les r\u00e9gions d&#8217;hydrog\u00e8ne ionis\u00e9 (appel\u00e9es H II) se caract\u00e9risent par une belle couleur rouge. En voici un autre exemple avec cette spectaculaire image de la c\u00e9l\u00e8bre galaxie du Triangle, Messier 33 :<\/p>\n<figure id=\"attachment_18749\" aria-describedby=\"caption-attachment-18749\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/10\/m33.jpg\" rel=\"lightbox[18493]\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-18749 size-medium\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/10\/m33-450x292.jpg\" alt=\"\" width=\"450\" height=\"292\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/10\/m33-450x292.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/10\/m33-1024x665.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/10\/m33-768x499.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2023\/10\/m33.jpg 1107w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-18749\" class=\"wp-caption-text\">Une autre vision de Messier 33, la galaxie du Triangle. \u00a9 <a href=\"https:\/\/www.astrobin.com\/fq2gzo\/D\/\" target=\"_blank\" rel=\"noopener\">Mickael Coulon\/Julien Cadena<\/a><\/figcaption><\/figure>\n<p>Les astronomes connaissent plusieurs m\u00e9canismes qui permettent d&#8217;expliquer la pr\u00e9sence d&#8217;hydrog\u00e8ne ionis\u00e9. Pour cela, il faut que l&#8217;hydrog\u00e8ne stellaire soit expos\u00e9 \u00e0 un rayonnement suffisamment \u00e9nerg\u00e9tique. C&#8217;est le cas \u00e0 proximit\u00e9 de jeunes \u00e9toiles chaudes ou encore pr\u00e8s de certains noyaux de galaxies dits actifs (ou AGN pour <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-noyau-actif-galaxie-5011\/\" target=\"_blank\" rel=\"noopener\"><em>Active Galactic Nucleus<\/em><\/a>). Enfin, l&#8217;apparition d&#8217;ondes de choc suite \u00e0 la fusion de deux galaxies peut aussi \u00eatre \u00e0 l&#8217;origine de la formation de r\u00e9gions H II. Il est possible de comparer les images de NGC 55 avec et sans l&#8217;apport de la raie H alpha <a href=\"http:\/\/www.atacama-photographic-observatory.com\/page_photo.php?id=239\" target=\"_blank\" rel=\"noopener\">en cliquant ici<\/a>.<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/01\/27\/flambee-de-jeunes-etoiles-dans-la-splendide-galaxie-ngc-1672\/\" target=\"_blank\" rel=\"noopener\">Flamb\u00e9e de jeunes \u00e9toiles dans la splendide galaxie NGC 1672<\/a><\/li>\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\/2022\/01\/04\/ngc-3314-lincroyable-fausse-collision-de-deux-galaxies\/\" target=\"_blank\" rel=\"noopener\">NGC 3314, l\u2019incroyable (fausse) collision entre deux galaxies<\/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>.<\/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;APO (Atacama Photographic Observatory) a immortalis\u00e9 NGC 55, une galaxie irr\u00e9guli\u00e8re vue par la tranche dans la constellation du Sculpteur. Cap sur le ciel austral : La galaxie NGC 55 (magnitude 8) a \u00e9t\u00e9 d\u00e9couverte par l&#8217;astronome \u00e9cossais James Dunlop en 1826. Elle est situ\u00e9e \u00e0 6 millions d&#8217;ann\u00e9es-lumi\u00e8re dans le Sculpteur (tout comme la &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2024\/02\/22\/la-belle-galaxie-australe-ngc-55-voit-rouge\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">La belle galaxie australe NGC 55 voit rouge<\/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":18494,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3460,2912,1412,3459],"class_list":["post-18493","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-atacama-photographic-observatory","tag-constellation-du-sculpteur","tag-galaxie-irreguliere","tag-ngc-55"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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