{"id":11882,"date":"2020-06-12T15:24:09","date_gmt":"2020-06-12T15:24:09","guid":{"rendered":"https:\/\/blogs.futura-sciences.com\/feldmann\/?p=11882"},"modified":"2020-07-06T12:37:52","modified_gmt":"2020-07-06T12:37:52","slug":"ngc-3718-la-galaxie-torsadee-la-plus-photogenique","status":"publish","type":"post","link":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/","title":{"rendered":"NGC 3718, la galaxie torsad\u00e9e la plus photog\u00e9nique"},"content":{"rendered":"

Dans la grande famille des galaxies, certaines sont particuli\u00e8rement belles \u00e0 photographier. C’est le cas de NGC 3718 dans la Grande Ourse.<\/strong><\/p>\n

Beaut\u00e9 discr\u00e8te :<\/h5>\n

Au cours du printemps, par une nuit sans Lune<\/a>, je vous invite \u00e0 pointer un puissant t\u00e9lescope du c\u00f4t\u00e9 de Phecda (Gamma Ursae Majoris<\/em>). Cette \u00e9toile marque le coin en bas \u00e0 gauche de la Grande Casserole. L’ast\u00e9risme en question est en r\u00e9alit\u00e9 la partie la plus c\u00e9l\u00e8bre de la Grande Ourse<\/a>.<\/p>\n

\"\"<\/a><\/p>\n

C’est dans cette zone que se cache NGC 3718, une magnifique galaxie tordue. Situ\u00e9e \u00e0 environ 45 millions d’ann\u00e9es-lumi\u00e8re, elle est tr\u00e8s discr\u00e8te visuellement avec une magnitude<\/a> de 10,6.\u00a0 Au point qu’elle est souvent n\u00e9glig\u00e9e au profit de la n\u00e9buleuse plan\u00e9taire du Hibou<\/a> (Messier 97) juste \u00e0 c\u00f4t\u00e9.<\/p>\n

Il faudra tout le talent et la patience d’un astrophotographe chevronn\u00e9 comme Martin Pugh<\/a> pour r\u00e9v\u00e9ler la beaut\u00e9 et la complexit\u00e9 de cette galaxie vrill\u00e9e.<\/p>\n

\"\"<\/a>
NGC 3718 est sans conteste la plus belle galaxie torsad\u00e9e. \u00a9 Martin Pugh<\/figcaption><\/figure>\n
Une voisine attirante :<\/h5>\n

NGC 3718 est une galaxie spirale barr\u00e9e qui a \u00e9t\u00e9 d\u00e9couverte le 12 avril 1789 par l’astronome germano-britannique William Herschel<\/a>. Sa forme torsad\u00e9e est produite par l’interaction gravitationnelle qui la lie \u00e0 une galaxie voisine, NGC 3729 (hors du champ de cette image). On remarque tout d’abord que des bandes de poussi\u00e8res sombres longent le bulbe central de NGC 3718. Les astronomes ont class\u00e9 ce noyau galactique dans la cat\u00e9gorie LINER (Low-Ionization Nuclear Emission-line Region<\/em>) en raison de son spectre d’\u00e9mission particulier (lire \u00e0 ce sujet : des galaxies se transforment soudainement en quasars<\/a>).<\/p>\n

La Voie lact\u00e9e aussi :<\/h5>\n

Les bras vaporeux de la galaxie pr\u00e9sentent la couleur bleut\u00e9e caract\u00e9ristique des r\u00e9gions riches en jeunes \u00e9toiles. Le groupe de petites galaxies \u00e0 gauche (Hickson 56 ou ARP 322) semble \u00eatre en contact avec NGC 3718 mais il n’en est rien puisqu’il se situe \u00e0 plus de 360 millions d’ann\u00e9es-lumi\u00e8re. Les galaxies torsad\u00e9es comme NGC 3718 ne sont pas rares. Une \u00e9tude portant sur la distance et la luminosit\u00e9 d’une certaine cat\u00e9gorie d’\u00e9toiles a r\u00e9v\u00e9l\u00e9 que notre propre Voie lact\u00e9e subissait le m\u00eame sort (lire \u00e0 ce sujet : une carte 3D de la Voie lact\u00e9e r\u00e9v\u00e8le qu’elle n’est pas plate<\/a>).<\/p>\n","protected":false},"excerpt":{"rendered":"

Dans la grande famille des galaxies, certaines sont particuli\u00e8rement belles \u00e0 photographier. C’est le cas de NGC 3718 dans la Grande Ourse. Beaut\u00e9 discr\u00e8te : Au cours du printemps, par une nuit sans Lune, je vous invite \u00e0 pointer un puissant t\u00e9lescope du c\u00f4t\u00e9 de Phecda (Gamma Ursae Majoris). Cette \u00e9toile marque le coin en … Continuer la lecture de NGC 3718, la galaxie torsad\u00e9e la plus photog\u00e9nique<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":11883,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_links_to":"","_links_to_target":""},"categories":[84],"tags":[456,2809],"class_list":["post-11882","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-ciel-etoile","tag-constellation-de-la-grande-ourse","tag-ngc-3718"],"yoast_head":"\nNGC 3718, la galaxie torsad\u00e9e la plus photog\u00e9nique<\/title>\n<meta name=\"description\" content=\"Dans la grande famille des galaxies, certaines sont particuli\u00e8rement belles \u00e0 photographier. C'est le cas de NGC 3718 dans la Grande Ourse.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"NGC 3718, la galaxie torsad\u00e9e la plus photog\u00e9nique\" \/>\n<meta property=\"og:description\" content=\"Dans la grande famille des galaxies, certaines sont particuli\u00e8rement belles \u00e0 photographier. C'est le cas de NGC 3718 dans la Grande Ourse.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/\" \/>\n<meta property=\"og:site_name\" content=\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\" \/>\n<meta property=\"article:published_time\" content=\"2020-06-12T15:24:09+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2020-07-06T12:37:52+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/galaxie.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1500\" \/>\n\t<meta property=\"og:image:height\" content=\"902\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Jean-Baptiste FELDMANN\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"Jean-Baptiste FELDMANN\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"2 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"WebPage\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/\",\"name\":\"NGC 3718, la galaxie torsad\u00e9e la plus photog\u00e9nique\",\"isPartOf\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/#primaryimage\"},\"image\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/galaxie.jpg\",\"datePublished\":\"2020-06-12T15:24:09+00:00\",\"dateModified\":\"2020-07-06T12:37:52+00:00\",\"author\":{\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea\"},\"description\":\"Dans la grande famille des galaxies, certaines sont particuli\u00e8rement belles \u00e0 photographier. C'est le cas de NGC 3718 dans la Grande Ourse.\",\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"ReadAction\",\"target\":[\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/\"]}]},{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/#primaryimage\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/galaxie.jpg\",\"contentUrl\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/galaxie.jpg\",\"width\":1500,\"height\":902,\"caption\":\"Dans le bestiaire galactique, NGC 3718 est sans conteste la plus belle galaxie torsad\u00e9e. \u00a9 Martin Pugh\"},{\"@type\":\"WebSite\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#website\",\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/\",\"name\":\"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel\",\"description\":\""J'ai en moi un besoin terrible. Dirais-je le mot? La religion. Alors, je sors la nuit et je peins des \u00e9toiles." Vincent van Gogh\",\"potentialAction\":[{\"@type\":\"SearchAction\",\"target\":{\"@type\":\"EntryPoint\",\"urlTemplate\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/?s={search_term_string}\"},\"query-input\":{\"@type\":\"PropertyValueSpecification\",\"valueRequired\":true,\"valueName\":\"search_term_string\"}}],\"inLanguage\":\"fr-FR\"},{\"@type\":\"Person\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea\",\"name\":\"Jean-Baptiste FELDMANN\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"fr-FR\",\"@id\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/image\/\",\"url\":\"https:\/\/secure.gravatar.com\/avatar\/41f96607fde7a81a14570eec74177c42?s=96&d=mm&r=g\",\"contentUrl\":\"https:\/\/secure.gravatar.com\/avatar\/41f96607fde7a81a14570eec74177c42?s=96&d=mm&r=g\",\"caption\":\"Jean-Baptiste FELDMANN\"},\"url\":\"https:\/\/blogs.futura-sciences.com\/feldmann\/author\/jbfe\/\"}]}<\/script>\n<!-- \/ Yoast SEO plugin. -->","yoast_head_json":{"title":"NGC 3718, la galaxie torsad\u00e9e la plus photog\u00e9nique","description":"Dans la grande famille des galaxies, certaines sont particuli\u00e8rement belles \u00e0 photographier. C'est le cas de NGC 3718 dans la Grande Ourse.","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/","og_locale":"fr_FR","og_type":"article","og_title":"NGC 3718, la galaxie torsad\u00e9e la plus photog\u00e9nique","og_description":"Dans la grande famille des galaxies, certaines sont particuli\u00e8rement belles \u00e0 photographier. C'est le cas de NGC 3718 dans la Grande Ourse.","og_url":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/","og_site_name":"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel","article_published_time":"2020-06-12T15:24:09+00:00","article_modified_time":"2020-07-06T12:37:52+00:00","og_image":[{"width":1500,"height":902,"url":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/galaxie.jpg","type":"image\/jpeg"}],"author":"Jean-Baptiste FELDMANN","twitter_card":"summary_large_image","twitter_misc":{"\u00c9crit par":"Jean-Baptiste FELDMANN","Dur\u00e9e de lecture estim\u00e9e":"2 minutes"},"schema":{"@context":"https:\/\/schema.org","@graph":[{"@type":"WebPage","@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/","url":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/","name":"NGC 3718, la galaxie torsad\u00e9e la plus photog\u00e9nique","isPartOf":{"@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/#website"},"primaryImageOfPage":{"@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/#primaryimage"},"image":{"@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/#primaryimage"},"thumbnailUrl":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/galaxie.jpg","datePublished":"2020-06-12T15:24:09+00:00","dateModified":"2020-07-06T12:37:52+00:00","author":{"@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea"},"description":"Dans la grande famille des galaxies, certaines sont particuli\u00e8rement belles \u00e0 photographier. C'est le cas de NGC 3718 dans la Grande Ourse.","inLanguage":"fr-FR","potentialAction":[{"@type":"ReadAction","target":["https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/"]}]},{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/2020\/06\/12\/ngc-3718-la-galaxie-torsadee-la-plus-photogenique\/#primaryimage","url":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/galaxie.jpg","contentUrl":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-content\/uploads\/sites\/9\/2020\/04\/galaxie.jpg","width":1500,"height":902,"caption":"Dans le bestiaire galactique, NGC 3718 est sans conteste la plus belle galaxie torsad\u00e9e. \u00a9 Martin Pugh"},{"@type":"WebSite","@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/#website","url":"https:\/\/blogs.futura-sciences.com\/feldmann\/","name":"CIELMANIA : le blog de Jean-Baptiste FELDMANN, photographe du ciel","description":""J'ai en moi un besoin terrible. Dirais-je le mot? La religion. Alors, je sors la nuit et je peins des \u00e9toiles." Vincent van Gogh","potentialAction":[{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https:\/\/blogs.futura-sciences.com\/feldmann\/?s={search_term_string}"},"query-input":{"@type":"PropertyValueSpecification","valueRequired":true,"valueName":"search_term_string"}}],"inLanguage":"fr-FR"},{"@type":"Person","@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/62b391b709c307783237b759b62731ea","name":"Jean-Baptiste FELDMANN","image":{"@type":"ImageObject","inLanguage":"fr-FR","@id":"https:\/\/blogs.futura-sciences.com\/feldmann\/#\/schema\/person\/image\/","url":"https:\/\/secure.gravatar.com\/avatar\/41f96607fde7a81a14570eec74177c42?s=96&d=mm&r=g","contentUrl":"https:\/\/secure.gravatar.com\/avatar\/41f96607fde7a81a14570eec74177c42?s=96&d=mm&r=g","caption":"Jean-Baptiste FELDMANN"},"url":"https:\/\/blogs.futura-sciences.com\/feldmann\/author\/jbfe\/"}]}},"_links":{"self":[{"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/posts\/11882","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/users\/8"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/comments?post=11882"}],"version-history":[{"count":5,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/posts\/11882\/revisions"}],"predecessor-version":[{"id":11889,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/posts\/11882\/revisions\/11889"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/media\/11883"}],"wp:attachment":[{"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/media?parent=11882"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/categories?post=11882"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.futura-sciences.com\/feldmann\/wp-json\/wp\/v2\/tags?post=11882"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}