{"id":1480,"date":"2015-08-06T16:32:15","date_gmt":"2015-08-06T15:32:15","guid":{"rendered":"http:\/\/www.orionpx.fr\/project\/blog\/?p=1480"},"modified":"2015-08-06T16:32:15","modified_gmt":"2015-08-06T15:32:15","slug":"lobjet-de-hoag","status":"publish","type":"post","link":"http:\/\/www.orionpx.fr\/project\/blog\/lobjet-de-hoag\/","title":{"rendered":"L&rsquo;objet de Hoag"},"content":{"rendered":"<p><a href=\"http:\/\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/08\/Hoags_object.jpg\"><img loading=\"lazy\" decoding=\"async\" data-attachment-id=\"1477\" data-permalink=\"http:\/\/www.orionpx.fr\/project\/blog\/lobjet-de-hoag\/idl-tiff-file-2\/\" data-orig-file=\"http:\/\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/08\/Hoags_object.jpg\" data-orig-size=\"1521,1489\" data-comments-opened=\"1\" data-image-meta=\"{&quot;aperture&quot;:&quot;0&quot;,&quot;credit&quot;:&quot;&quot;,&quot;camera&quot;:&quot;&quot;,&quot;caption&quot;:&quot;IDL TIFF file&quot;,&quot;created_timestamp&quot;:&quot;0&quot;,&quot;copyright&quot;:&quot;&quot;,&quot;focal_length&quot;:&quot;0&quot;,&quot;iso&quot;:&quot;0&quot;,&quot;shutter_speed&quot;:&quot;0&quot;,&quot;title&quot;:&quot;IDL TIFF file&quot;,&quot;orientation&quot;:&quot;1&quot;}\" data-image-title=\"Objet de Hoag\" data-image-description=\"\" data-image-caption=\"&lt;p&gt;Objet de Hoag&lt;\/p&gt;\n\" data-large-file=\"http:\/\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/08\/Hoags_object-1024x1002.jpg\" class=\"alignleft wp-image-1477 size-medium\" src=\"http:\/\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/08\/Hoags_object-300x294.jpg\" alt=\"Objet de Hoag\" width=\"300\" height=\"294\" srcset=\"http:\/\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/08\/Hoags_object-300x294.jpg 300w, http:\/\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/08\/Hoags_object-1024x1002.jpg 1024w, http:\/\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/08\/Hoags_object.jpg 1521w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a>D\u00e9couvert par Arthur Hoag en 1950, cet objet (PGC 54559 ici photographi\u00e9 par Hubble) \u00e0 la forme tr\u00e8s particuli\u00e8re fut d&rsquo;abord pris pour un <a href=\"http:\/\/www.orionpx.fr\/project\/blog\/les-trous-noirs-au-dela-de-notre-perception-partie-1\/#Les-mirages-gravitationnels\">anneau d&rsquo;Einstein<\/a> par son d\u00e9couvreur. Puis, en analysant son d\u00e9calage vers le rouge (<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Effet_Doppler\" target=\"_blank\">effet Doppler<\/a>), il fut conclu qu&rsquo;il ne s&rsquo;agissait pas d&rsquo;un mirage gravitationnel, mais d&rsquo;une galaxie tout \u00e0 fait normale quoique d&rsquo;une g\u00e9om\u00e9trie tr\u00e8s atypique.<\/p>\n<p>Situ\u00e9e dans la constellation du Serpent, son diam\u00e8tre de plus de 120 000 ann\u00e9es-lumi\u00e8re est plus grand que notre galaxie, mais sa structure est inhabituelle dans le sens o\u00f9 sa p\u00e9riph\u00e9rie est compos\u00e9e d&rsquo;\u00e9toiles jeunes et massives (bleues), tandis que son centre contient des \u00e9toiles plus vieilles et plus petites (jaunes). L&rsquo;espace entre les deux est tr\u00e8s certainement occup\u00e9 par des amas d&rsquo;\u00e9toiles plus sombres et dont la lumi\u00e8re ne nous atteint pas suffisamment pour \u00eatre visible.<\/p>\n<p>L&rsquo;origine de cette sym\u00e9trie si particuli\u00e8re reste myst\u00e9rieuse. L&rsquo;une des principales hypoth\u00e8ses tendrait \u00e0 dire qu&rsquo;une autre galaxie serait pass\u00e9e \u00e0 proximit\u00e9 il y a 2 ou 3 milliards d&rsquo;ann\u00e9es et qu&rsquo;une partie de sa mati\u00e8re aurait \u00e9t\u00e9 captur\u00e9e par l&rsquo;objet de Hoag, provoquant la naissance brutale de quantit\u00e9 d&rsquo;\u00e9toiles dans le tumulte de la rencontre.<\/p>\n<p>Vous pouvez remarquer qu&rsquo;un objet du m\u00eame type (galaxie \u00e0 anneau) apparait entre les deux anneaux. Il s&rsquo;agit sans doute d&rsquo;<a href=\"http:\/\/hubblesite.org\/newscenter\/archive\/releases\/2002\/21\/image\/a\/\" target=\"_blank\">une autre galaxie plus lointaine<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>D\u00e9couvert par Arthur Hoag en 1950, cet objet (PGC 54559 ici photographi\u00e9 par Hubble) \u00e0 la forme tr\u00e8s particuli\u00e8re fut d&rsquo;abord pris pour un anneau d&rsquo;Einstein par son d\u00e9couvreur. Puis, en analysant son d\u00e9calage vers le rouge (effet Doppler), il fut conclu qu&rsquo;il ne s&rsquo;agissait pas d&rsquo;un mirage gravitationnel, mais d&rsquo;une galaxie tout \u00e0 fait &hellip; <\/p>\n<p><a class=\"more-link btn\" href=\"http:\/\/www.orionpx.fr\/project\/blog\/lobjet-de-hoag\/\">Lire la suite<\/a><\/p>\n","protected":false},"author":8,"featured_media":1477,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"image","meta":{"jetpack_post_was_ever_published":false,"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[60],"tags":[195,193,61,197,66,194,196],"class_list":["post-1480","post","type-post","status-publish","format-image","has-post-thumbnail","hentry","category-la-photo-qui-sort-du-lot","tag-anneau-deinstein","tag-galaxie","tag-gravite","tag-hoag","tag-hubble","tag-mirage-gravitationnel","tag-serpent","post_format-post-format-image","item-wrap"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>L&#039;objet de Hoag - Orion PX<\/title>\n<meta name=\"description\" content=\"D\u00e9couvert par Arthur Hoag en 1950, l&#039;objet de Hoag \u00e0 la forme tr\u00e8s particuli\u00e8re fut d&#039;abord pris pour un anneau d&#039;Einstein par son d\u00e9couvreur. Puis, en analysant son d\u00e9calage vers le rouge (effet Doppler), il fut conclu qu&#039;il ne s&#039;agissait pas d&#039;un mirage gravitationnel, mais d&#039;une galaxie tout \u00e0 fait normale quoique d&#039;une g\u00e9om\u00e9trie tr\u00e8s atypique.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"http:\/\/www.orionpx.fr\/project\/blog\/lobjet-de-hoag\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"L&#039;objet de Hoag - Orion PX\" \/>\n<meta property=\"og:description\" content=\"D\u00e9couvert par Arthur Hoag en 1950, l&#039;objet de Hoag \u00e0 la forme tr\u00e8s particuli\u00e8re fut d&#039;abord pris pour un anneau d&#039;Einstein par son d\u00e9couvreur. Puis, en analysant son d\u00e9calage vers le rouge (effet Doppler), il fut conclu qu&#039;il ne s&#039;agissait pas d&#039;un mirage gravitationnel, mais d&#039;une galaxie tout \u00e0 fait normale quoique d&#039;une g\u00e9om\u00e9trie tr\u00e8s atypique.\" \/>\n<meta property=\"og:url\" content=\"http:\/\/www.orionpx.fr\/project\/blog\/lobjet-de-hoag\/\" \/>\n<meta property=\"og:site_name\" content=\"Orion PX\" \/>\n<meta property=\"article:published_time\" content=\"2015-08-06T15:32:15+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/08\/Hoags_object.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1521\" \/>\n\t<meta property=\"og:image:height\" content=\"1489\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"C.P. Rigel\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"C.P. Rigel\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"http:\\\/\\\/www.orionpx.fr\\\/project\\\/blog\\\/lobjet-de-hoag\\\/#article\",\"isPartOf\":{\"@id\":\"http:\\\/\\\/www.orionpx.fr\\\/project\\\/blog\\\/lobjet-de-hoag\\\/\"},\"author\":{\"name\":\"C.P. 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J\u2019ai ce besoin visc\u00e9ral d\u2019observer, d\u00e9cortiquer, d\u00e9monter, comprendre et apprendre. Tout est source de d\u00e9couverte et d\u2019\u00e9merveillement. Il \u00e9tait donc logique qu\u2019un jour je me tourne vers les myst\u00e8res de l\u2019univers. F\u00e9ru d\u2019astrophysique, de physique, et d\u2019astronomie, je n\u2019en suis pas moins un parfait amateur. J\u2019aime apprendre par moi-m\u00eame et d\u00e9battre de mes acquis pour les mettre \u00e0 l\u2019\u00e9preuve. (Le reste de ma biographie ici)","sameAs":["https:\/\/x.com\/Cprigel"],"url":"http:\/\/www.orionpx.fr\/project\/blog\/author\/cprigel\/"}]}},"jetpack_publicize_connections":[],"jetpack_featured_media_url":"http:\/\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/08\/Hoags_object.jpg","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p4Oe1l-nS","jetpack_likes_enabled":false,"jetpack-related-posts":[{"id":649,"url":"http:\/\/www.orionpx.fr\/project\/blog\/un-smiley-gravitationnel\/","url_meta":{"origin":1480,"position":0},"title":"Un Smiley Gravitationnel","author":"C.P. Rigel","date":"11 f\u00e9vrier 2015","format":"image","excerpt":"Parce qu'un blog c'est aussi du visuel et pas que du textuel, j'ai d\u00e9cid\u00e9 de publier r\u00e9guli\u00e8rement ici les photographies qui m'auront particuli\u00e8rement marqu\u00e9es sous la cat\u00e9gorie: La photo qui sort du lot Aujourd'hui c'est le smiley gravitationnel qui est \u00e0 l'honneur. Le ph\u00e9nom\u00e8ne \u00e0 qui nous devons cette surprenante\u2026","rel":"","context":"Dans &quot;La photo qui sort du lot&quot;","block_context":{"text":"La photo qui sort du lot","link":"http:\/\/www.orionpx.fr\/project\/blog\/category\/photos\/la-photo-qui-sort-du-lot\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/02\/potw1506a.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/02\/potw1506a.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/02\/potw1506a.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/02\/potw1506a.jpg?resize=700%2C400 2x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/02\/potw1506a.jpg?resize=1050%2C600 3x"},"classes":[]},{"id":1142,"url":"http:\/\/www.orionpx.fr\/project\/blog\/les-trous-noirs-au-dela-de-notre-perception-partie-1\/","url_meta":{"origin":1480,"position":1},"title":"Les trous noirs : Au del\u00e0 de notre perception (Partie 1)","author":"C.P. Rigel","date":"21 mai 2015","format":false,"excerpt":"Il est des myst\u00e8res que m\u00eame la science moderne peine \u00e0 \u00e9lucider. Pourtant, elle pr\u00e9dit avec une grande exactitude l'existence de l'un d'entre eux. Sa forme, ses param\u00e8tres, sa localisation, son environnement... Mais elle est incapable de pr\u00e9dire ce qu'il se passe \u00e0 l'int\u00e9rieur. L'int\u00e9rieur d'un trou noir est un\u2026","rel":"","context":"Dans &quot;Espace &amp; Astrophysique&quot;","block_context":{"text":"Espace &amp; Astrophysique","link":"http:\/\/www.orionpx.fr\/project\/blog\/category\/divers\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/05\/interstellar-trou-noir.png?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/05\/interstellar-trou-noir.png?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/05\/interstellar-trou-noir.png?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/05\/interstellar-trou-noir.png?resize=700%2C400 2x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/05\/interstellar-trou-noir.png?resize=1050%2C600 3x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/05\/interstellar-trou-noir.png?resize=1400%2C800 4x"},"classes":[]},{"id":1678,"url":"http:\/\/www.orionpx.fr\/project\/blog\/remanent-de-supernova-n63-a\/","url_meta":{"origin":1480,"position":2},"title":"R\u00e9manent de supernova N63 A","author":"C.P. Rigel","date":"19 octobre 2015","format":"image","excerpt":"Cette photographie, prise par le t\u00e9lescope spatial Hubble en 2008, montre une petite partie d'une pouponni\u00e8re\u00a0d'\u00e9toiles, appel\u00e9e N63, dans la galaxie naine du Grand Nuage de Magellan. Cette petite galaxie spirale est un satellite de la Voie Lact\u00e9e, distante du Soleil de 163 000 ann\u00e9es-lumi\u00e8re, elle est visible depuis\u00a0l'h\u00e9misph\u00e8re sud.\u2026","rel":"","context":"Dans &quot;La photo qui sort du lot&quot;","block_context":{"text":"La photo qui sort du lot","link":"http:\/\/www.orionpx.fr\/project\/blog\/category\/photos\/la-photo-qui-sort-du-lot\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/N63A.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/N63A.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/N63A.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/N63A.jpg?resize=700%2C400 2x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/N63A.jpg?resize=1050%2C600 3x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/N63A.jpg?resize=1400%2C800 4x"},"classes":[]},{"id":1215,"url":"http:\/\/www.orionpx.fr\/project\/blog\/les-trous-noirs-au-dela-de-notre-perception-partie-2\/","url_meta":{"origin":1480,"position":3},"title":"Les trous noirs : Au del\u00e0 de notre perception (Partie 2)","author":"C.P. Rigel","date":"15 juin 2015","format":false,"excerpt":"Si vous avez lu la premi\u00e8re partie de l'article consacr\u00e9 aux trous noirs, vous avez pu vous familiariser avec ces objets chers aux auteurs de science-fiction. Si vous ne l'avez pas lu, je vous conseille fortement d'y jeter un \u0153il avant de continuer, car maintenant je vous propose d'approfondir un\u2026","rel":"","context":"Dans &quot;Espace &amp; Astrophysique&quot;","block_context":{"text":"Espace &amp; Astrophysique","link":"http:\/\/www.orionpx.fr\/project\/blog\/category\/divers\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/06\/BH_wip_v18_1080p_planet.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/06\/BH_wip_v18_1080p_planet.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/06\/BH_wip_v18_1080p_planet.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/06\/BH_wip_v18_1080p_planet.jpg?resize=700%2C400 2x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/06\/BH_wip_v18_1080p_planet.jpg?resize=1050%2C600 3x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/06\/BH_wip_v18_1080p_planet.jpg?resize=1400%2C800 4x"},"classes":[]},{"id":1629,"url":"http:\/\/www.orionpx.fr\/project\/blog\/les-cataclysmes-cosmiques\/","url_meta":{"origin":1480,"position":4},"title":"Les cataclysmes cosmiques","author":"C.P. Rigel","date":"15 octobre 2015","format":false,"excerpt":"Le 16 juillet 1945, au beau milieu du d\u00e9sert du Nouveau-Mexique, explosait la toute premi\u00e8re bombe \u00e0 fission nucl\u00e9aire. D\u00e9gageant une puissance de 21 kilotonnes, soit 87 864 Gigajoules. Ce jour l\u00e0, l'humanit\u00e9 eut un exemple concret de la quantit\u00e9 d'\u00e9nergie que pouvait contenir la mati\u00e8re. Et m\u00eame si ces\u2026","rel":"","context":"Dans &quot;Espace &amp; Astrophysique&quot;","block_context":{"text":"Espace &amp; Astrophysique","link":"http:\/\/www.orionpx.fr\/project\/blog\/category\/divers\/espace\/"},"img":{"alt_text":"","src":"https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/sun-outer-space-stars-explosions-planets-last-supernova-1440x1080-wallpaper.jpg?resize=350%2C200","width":350,"height":200,"srcset":"https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/sun-outer-space-stars-explosions-planets-last-supernova-1440x1080-wallpaper.jpg?resize=350%2C200 1x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/sun-outer-space-stars-explosions-planets-last-supernova-1440x1080-wallpaper.jpg?resize=525%2C300 1.5x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/sun-outer-space-stars-explosions-planets-last-supernova-1440x1080-wallpaper.jpg?resize=700%2C400 2x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/sun-outer-space-stars-explosions-planets-last-supernova-1440x1080-wallpaper.jpg?resize=1050%2C600 3x, https:\/\/i0.wp.com\/www.orionpx.fr\/project\/blog\/wp-content\/uploads\/2015\/10\/sun-outer-space-stars-explosions-planets-last-supernova-1440x1080-wallpaper.jpg?resize=1400%2C800 4x"},"classes":[]},{"id":830,"url":"http:\/\/www.orionpx.fr\/project\/blog\/les-piliers-de-la-creation\/","url_meta":{"origin":1480,"position":5},"title":"Les Piliers de la Cr\u00e9ation","author":"C.P. Rigel","date":"24 f\u00e9vrier 2015","format":"image","excerpt":"Cette incroyable photographie a \u00e9t\u00e9 prise par le t\u00e9lescope spatial Hubble en 2014 et publi\u00e9e par la NASA le 5 Janvier 2015. Il s'agit d'un clich\u00e9 en haute d\u00e9finition des Piliers de la Cr\u00e9ation, un d\u00e9tail de la n\u00e9buleuse de l'Aigle dans l'amas M16. 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