{"id":16332,"date":"2022-10-05T13:50:38","date_gmt":"2022-10-05T13:50:38","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=16332"},"modified":"2022-10-17T15:14:10","modified_gmt":"2022-10-17T15:14:10","slug":"ugca-193-letrange-galaxie-dont-les-etoiles-sont-bleues","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/10\/05\/ugca-193-letrange-galaxie-dont-les-etoiles-sont-bleues\/","title":{"rendered":"UGCA 193, l&#8217;\u00e9trange galaxie dont les \u00e9toiles sont bleues"},"content":{"rendered":"<p><strong>Dans la constellation du Sextant, la galaxie spirale UGCA 193 (que nous voyons par la tranche) pr\u00e9sente une forte densit\u00e9 d&#8217;\u00e9toiles bleues.<\/strong><\/p>\n<h5><strong>Une curieuse galaxie dans le Sextant :\u00a0<\/strong><\/h5>\n<p>UGCA 193 est l&#8217;une des galaxies rassembl\u00e9es dans le <em>Uppsala General Catalogue Addendum<\/em>. Ce dernier est un additif \u00e0 l&#8217;UGC (<em>Uppsala General Catalogue of Galaxies<\/em>), un recueil de pr\u00e8s de 13.000 galaxies r\u00e9alis\u00e9 par l&#8217;astronome su\u00e9dois <a href=\"https:\/\/ned.ipac.caltech.edu\/level5\/March02\/Nilson\/Nilson_contents.html\" target=\"_blank\" rel=\"noopener\">Peter Nilson<\/a>. Perdue dans la modeste constellation du Sextant, UGCA 193 n&#8217;est pas accessible aux lunettes astronomiques des amateurs. Il faut faire appel au t\u00e9lescope spatial Hubble pour d\u00e9couvrir celle que les astronomes comparent \u00e0 une <a href=\"https:\/\/esahubble.org\/images\/potw2044a\/\" target=\"_blank\" rel=\"noopener\">cascade d&#8217;\u00e9toiles<\/a> :<\/p>\n<figure id=\"attachment_16333\" aria-describedby=\"caption-attachment-16333\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/UGCA193.jpg\" rel=\"lightbox[16332]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16333\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/UGCA193-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/UGCA193-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/UGCA193-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/UGCA193-768x460.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/UGCA193.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-16333\" class=\"wp-caption-text\">La galaxie UGCA 193 montre une grande quantit\u00e9 d&#8217;\u00e9toiles bleues. \u00a9 ESA\/Hubble\/NASA<\/figcaption><\/figure>\n<p>Sur ce clich\u00e9, nous d\u00e9couvrons une \u00e9trange galaxie spirale situ\u00e9e \u00e0 plus de 30 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>. L&#8217;objet c\u00e9leste est singulier \u00e0 plus d&#8217;un titre. D&#8217;abord, parce qu&#8217;il s&#8217;agit d&#8217;une galaxie spirale vue exactement par la tranche, comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2021\/02\/08\/ce-fuseau-argente-ic-2233-est-une-galaxie-spirale-ultra-mince\/\" target=\"_blank\" rel=\"noopener\">IC 2233<\/a>. Ensuite, parce qu&#8217;elle compte une tr\u00e8s forte proportion d&#8217;\u00e9toiles bleues.<!--more--><\/p>\n<h5>La vie en bleu :<\/h5>\n<p>Quand nous regardons le ciel par une nuit sans nuages et sans <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/06\/19\/cette-semaine-la-lune-traverse-le-grand-alignement-des-planetes\/\" target=\"_blank\" rel=\"noopener\">Lune<\/a>, nous pouvons remarquer que les \u00e9toiles pr\u00e9sentent diff\u00e9rentes couleurs. Ces derni\u00e8res nous donnent des informations sur l&#8217;\u00e2ge et la temp\u00e9rature de ces astres. Les plus jeunes comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/08\/16\/zoom-sur-vega-la-plus-belle-etoile-du-ciel-dete\/\" target=\"_blank\" rel=\"noopener\">V\u00e9ga<\/a> sont bleues et tr\u00e8s chaudes, les plus \u00e2g\u00e9es comme <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2019\/08\/31\/spectacle-celeste-jupiter-a-proximite-de-letoile-supergeante-antares\/\" target=\"_blank\" rel=\"noopener\">Antar\u00e8s<\/a> ou <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/01\/18\/betelgeuse-les-aborigenes-australiens-connaissaient-deja-sa-variabilite\/\" target=\"_blank\" rel=\"noopener\">B\u00e9telgeuse<\/a> sont rougissantes :<\/p>\n<figure id=\"attachment_16302\" aria-describedby=\"caption-attachment-16302\" style=\"width: 450px\" class=\"wp-caption alignnone\"><a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega.jpg\" rel=\"lightbox[16332]\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-16302\" src=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega-450x270.jpg\" alt=\"\" width=\"450\" height=\"270\" srcset=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega-450x270.jpg 450w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega-1024x614.jpg 1024w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega-768x461.jpg 768w, https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2022\/08\/vega.jpg 1500w\" sizes=\"auto, (max-width: 450px) 100vw, 450px\" \/><\/a><figcaption id=\"caption-attachment-16302\" class=\"wp-caption-text\">V\u00e9ga est une jeune \u00e9toile tr\u00e8s chaude avec une belle couleur bleue. \u00a9 <a href=\"https:\/\/www.astrobin.com\/users\/jmtanous\/\" target=\"_blank\" rel=\"noopener\">Jose Mtanous<\/a><\/figcaption><\/figure>\n<p>Pour d&#8217;\u00e9ventuels \u00eatres vivants install\u00e9s dans la galaxie du Sextant,\u00a0 le ciel nocturne est piquet\u00e9 d&#8217;\u00e9toiles bleues. Cette proportion anormalement \u00e9lev\u00e9e de jeunes astres pourrait \u00eatre li\u00e9e \u00e0 un sursaut de formation stellaire. Un ph\u00e9nom\u00e8ne dont les astronomes ne connaissent pour l&#8217;instant pas la raison. Tout ce bleu provoque une sensation d&#8217;apaisement, qui ne doit pas nous faire oublier que la plupart de ces g\u00e9antes bleues termineront leur courte vie (moins de 100 millions d&#8217;ann\u00e9e) en <a href=\"https:\/\/www.futura-sciences.com\/sciences\/definitions\/univers-supernova-60\/\" target=\"_blank\" rel=\"noopener\">supernova<\/a>.<\/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 et d\u00e9couvrez mes images du ciel en vous abonnant \u00e0 Cielmania sur <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>Dans la constellation du Sextant, la galaxie spirale UGCA 193 (que nous voyons par la tranche) pr\u00e9sente une forte densit\u00e9 d&#8217;\u00e9toiles bleues. Une curieuse galaxie dans le Sextant :\u00a0 UGCA 193 est l&#8217;une des galaxies rassembl\u00e9es dans le Uppsala General Catalogue Addendum. Ce dernier est un additif \u00e0 l&#8217;UGC (Uppsala General Catalogue of Galaxies), un &hellip; <a href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2022\/10\/05\/ugca-193-letrange-galaxie-dont-les-etoiles-sont-bleues\/\" class=\"more-link\">Continuer la lecture de <span class=\"screen-reader-text\">UGCA 193, l&#8217;\u00e9trange galaxie dont les \u00e9toiles sont bleues<\/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":16333,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[3257,403,544,3258],"class_list":["post-16332","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-du-sextant","tag-supernova","tag-telescope-spatial-hubble","tag-ugca-193"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v24.1 - 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