{"id":16440,"date":"2022-11-16T16:49:13","date_gmt":"2022-11-16T16:49:13","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=16440"},"modified":"2022-11-22T17:02:53","modified_gmt":"2022-11-22T17:02:53","slug":"trois-galaxies-senlacent-dans-la-constellation-du-poisson-austral","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/11\/16\/trois-galaxies-senlacent-dans-la-constellation-du-poisson-austral\/","title":{"rendered":"Trois galaxies s&#8217;enlacent du c\u00f4t\u00e9 de l&#8217;\u00e9toile Fomalhaut"},"content":{"rendered":"<p><strong>Le Groupe galactique compact Hickson 91 se niche dans la constellation du Poisson Austral, \u00e0 320 millions d&#8217;ann\u00e9es-lumi\u00e8re.<\/strong><\/p>\n<h5>Une c\u00e9l\u00e8bre petite constellation :<\/h5>\n<p>Sous le <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-constellation-pegase-6332\/\" target=\"_blank\" rel=\"noopener\">Carr\u00e9 de P\u00e9gase<\/a>, au ras de l&#8217;horizon, la petite constellation du Poisson Austral fait assez p\u00e2le figure. Elle est pourtant c\u00e9l\u00e8bre pour son \u00e9toile principale, Fomalhaut. Les astronomes ont en effet d\u00e9couvert qu\u2019elle est entour\u00e9e d\u2019un anneau qui se compose de glace et de poussi\u00e8res. On imagine qu\u2019il s\u2019y produit de multiples collisions entre des com\u00e8tes\u00a0et de futures plan\u00e8tes, des plan\u00e9t\u00e9simaux. En combinant les donn\u00e9es du r\u00e9seau\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/09\/18\/alma-portrait-dun-radiotelescope-geant-sous-la-voie-lactee\/\" target=\"_blank\" rel=\"noopener noreferrer\">ALMA<\/a>\u00a0et du\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2015\/04\/24\/en-video-science-et-poesie-pour-feter-le-telescope-hubble\/\" target=\"_blank\" rel=\"noopener noreferrer\">t\u00e9lescope Hubble<\/a>, on obtient une fascinante image de cet anneau qui fait penser \u00e0 un \u0153il gigantesque (ci-dessous). On le surnomme d\u2019ailleurs l\u2019Oeil de Sauron, l\u2019un des personnages du Seigneur des Anneaux :<\/p>\n<figure id=\"attachment_11265\" aria-describedby=\"caption-attachment-11265\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/10\/fomalhaut.jpg\" rel=\"lightbox[16440]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-11265\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/10\/fomalhaut-450x291.jpg\" alt=\"\" width=\"450\" height=\"291\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/10\/fomalhaut-450x291.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/10\/fomalhaut-768x497.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/10\/fomalhaut-1024x663.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2019\/10\/fomalhaut.jpg 1080w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-11265\" class=\"wp-caption-text\">Un anneau de glace et de poussi\u00e8re entoure l&#8217;\u00e9toile Fomalhaut. \u00a9 ALMA\/NASA\/Hubble<\/figcaption><\/figure>\n<p>L\u00e9gende ou histoire v\u00e9ridique ? On raconte qu\u2019il y a 3.000 ans, en Perse (l\u2019actuel Iran), Fomalhaut \u00e9tait l\u2019une des quatre \u00e9toiles royales. Elle tr\u00f4nait dans l\u2019une des quatre r\u00e9gions c\u00e9lestes, les autres \u00e9tant gouvern\u00e9es par\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2017\/04\/29\/lumiere-cendree-aux-cotes-de-letoile-aldebaran\/\" target=\"_blank\" rel=\"noopener noreferrer\">Ald\u00e9baran<\/a>,\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2014\/09\/06\/venus-regulus\/\" target=\"_blank\" rel=\"noopener noreferrer\">R\u00e9gulus<\/a>\u00a0et\u00a0<a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/08\/31\/spectacle-celeste-jupiter-a-proximite-de-letoile-supergeante-antares\/\" target=\"_blank\" rel=\"noopener noreferrer\">Antar\u00e8s<\/a>.<!--more--><\/p>\n<h5>Galaxies emm\u00eal\u00e9es :<\/h5>\n<p>Mais si je vous emm\u00e8ne aujourd&#8217;hui dans le Poisson Austral, c&#8217;est pour y admirer Hickson 91. Il s&#8217;agit d&#8217;un Groupe galactique compact situ\u00e9 \u00e0 320 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>. Il existe une centaine de ces groupes, r\u00e9f\u00e9renc\u00e9s au d\u00e9but des ann\u00e9es 1980 par l&#8217;astronome canadien <a href=\"https:\/\/www.americanscientist.org\/author\/paul_hickson\" target=\"_blank\" rel=\"noopener\">Paul Hickson<\/a>. Dans ces groupes, les galaxies sont tr\u00e8s proches les unes des autres, au point d&#8217;interagir entre elles. Ces interactions gravitationnelles se traduisent par d&#8217;immenses \u00e9charpes constitu\u00e9es de gaz et de poussi\u00e8res, bien visibles sur ce clich\u00e9 :<\/p>\n<figure id=\"attachment_16441\" aria-describedby=\"caption-attachment-16441\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/09\/hickson91.jpg\" rel=\"lightbox[16440]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16441\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/09\/hickson91-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/09\/hickson91-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/09\/hickson91-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/09\/hickson91-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/09\/hickson91.jpg 1499w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-16441\" class=\"wp-caption-text\">HCG 91 est un groupe de trois galaxies li\u00e9es par la gravit\u00e9. \u00a9 CHART32 Team\/J. Schedler<\/figcaption><\/figure>\n<p>Si Hickson 91 compte trois galaxies, un autre groupe est c\u00e9l\u00e8bre pour en compter cinq : c&#8217;est le\u00a0<a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/astronomie-quintette-stephan-6329\/\" target=\"_blank\" rel=\"noopener\">Quintette de Stephan<\/a> (Hickson 44).<\/p>\n<h5>Vous pourriez aimer :<\/h5>\n<ul>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/05\/17\/ngc-4565-la-belle-galaxie-spirale-oubliee-par-charles-messier\/\" target=\"_blank\" rel=\"noopener\">NGC 4565, la belle galaxie spirale oubli\u00e9e par Charles Messier<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/04\/16\/sixieme-supernova-pour-la-galaxie-spirale-ngc-3147\/\" target=\"_blank\" rel=\"noopener\">Une sixi\u00e8me supernova explose dans la galaxie NGC 3147<\/a><\/li>\n<li><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/03\/03\/pourquoi-le-coeur-de-la-galaxie-spirale-messier-94-est-il-si-brillant\/\" target=\"_blank\" rel=\"noopener\">Pourquoi le c\u0153ur de la galaxie Messier 94 est-il si brillant ?<\/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>Le Groupe galactique compact Hickson 91 se niche dans la constellation du Poisson Austral, \u00e0 320 millions d&#8217;ann\u00e9es-lumi\u00e8re. Une c\u00e9l\u00e8bre petite constellation : Sous le Carr\u00e9 de P\u00e9gase, au ras de l&#8217;horizon, la petite constellation du Poisson Austral fait assez p\u00e2le figure. Elle est pourtant c\u00e9l\u00e8bre pour son \u00e9toile principale, Fomalhaut. Les astronomes ont en &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/11\/16\/trois-galaxies-senlacent-dans-la-constellation-du-poisson-austral\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">Trois galaxies s&#8217;enlacent du c\u00f4t\u00e9 de l&#8217;\u00e9toile Fomalhaut<\/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":16441,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[377,3279,3278,3093],"class_list":["post-16440","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-du-poisson-austral","tag-groupe-galactique-compact","tag-hickson-91","tag-paul-hickson"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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