{"id":3310,"date":"2015-03-15T17:09:50","date_gmt":"2015-03-15T16:09:50","guid":{"rendered":"http:\/\/reperes-astro.fr\/?p=3310"},"modified":"2025-02-11T17:47:40","modified_gmt":"2025-02-11T16:47:40","slug":"cdh-quatre-gala","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/cdh-quatre-gala\/","title":{"rendered":"Quatre galaxies au lieu d&rsquo;une &#8230;."},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-medium-font-size\">APOD de Ciel des hommes&nbsp; : On en parle souvent mais cette photo parle encore mieux&#8230;<\/h2>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/03\/CDH-quatre-images.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"600\" height=\"529\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/03\/CDH-quatre-images.jpg\" alt=\"\" class=\"wp-image-3320\" style=\"object-fit:cover\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/03\/CDH-quatre-images.jpg 600w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2015\/03\/CDH-quatre-images-300x265.jpg 300w\" sizes=\"auto, (max-width: 600px) 100vw, 600px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>\u00c0 quoi correspondent ces points enserrant cette galaxie ?&nbsp; \u00c0 quatre images d&rsquo;une m\u00eame supernova.<\/p>\n\n\n\n<p>Pour la toute premi\u00e8re fois, une seule supernova a \u00e9t\u00e9 observ\u00e9e en&nbsp;<a href=\"http:\/\/arxiv.org\/abs\/1411.6009\">4 endroits diff\u00e9rents<\/a>&nbsp;par effet de&nbsp;<a href=\"http:\/\/imagine.gsfc.nasa.gov\/news\/grav_lens.html\">lentille gravitationnelle<\/a>.<\/p>\n\n\n\n<p>Dans&nbsp;<a href=\"http:\/\/www.sciencemag.org\/content\/347\/6226\/1123.abstract\">le cas pr\u00e9sent<\/a>, les masses impliqu\u00e9es sont une vaste galaxie ainsi que&nbsp;<a href=\"http:\/\/www.cidehom.com\/apod.php?_date=100502\">l&rsquo;amas<\/a>&nbsp;dont elle fait partie.&nbsp;<a href=\"http:\/\/hubblesite.org\/newscenter\/archive\/releases\/2015\/08\/image\/a\/\">Cette image<\/a>&nbsp;a \u00e9t\u00e9 prise en novembre dernier par le&nbsp;<a href=\"http:\/\/www.nasa.gov\/mission_pages\/hubble\/story\/\">t\u00e9lescope spatial Hubble<\/a>. Cette supernova d&rsquo;apparence&nbsp;<a href=\"http:\/\/www.cidehom.com\/apod.php?_date=130102\">quadruple<\/a>&nbsp;et appel\u00e9e&nbsp;<a href=\"http:\/\/en.wikipedia.org\/wiki\/Sjur_Refsdal\">Refsdal<\/a>&nbsp;en hommage \u00e0 un astrophysicien norv\u00e9gien pionnier de la recherche sur les lentilles gravitationnelles s&rsquo;est produite bien au-del\u00e0 de l&rsquo;amas. En mesurant les \u00e9carts entre les positions et les \u00e9ventuels d\u00e9calages temporels entre&nbsp;<a href=\"https:\/\/www.youtube.com\/watch?v=HLGGDqFwDa0\">les images de la supernova<\/a>, les astrophysiciens devraient pouvoir&nbsp;<a href=\"http:\/\/www.nytimes.com\/2015\/03\/06\/science\/astronomers-observe-supernova-and-find-theyre-watching-reruns.html\">en d\u00e9duire<\/a>&nbsp;la quantit\u00e9 de&nbsp;<a href=\"http:\/\/chandra.harvard.edu\/xray_astro\/dark_matter\/\">mati\u00e8re noire<\/a>&nbsp;pr\u00e9sente dans la galaxie et dans l&rsquo;amas. Avec un peu de&nbsp;<a href=\"http:\/\/sscroll.com\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2014\/07\/cat-waiting-window-60.jpg\">patience<\/a>&nbsp;et beaucoup de&nbsp;<a href=\"http:\/\/imgfave-herokuapp-com.global.ssl.fastly.net\/image_cache\/1265764841489934.jpeg\">chance<\/a>, il est possible qu&rsquo;une cinqui\u00e8me image de&nbsp;<a href=\"https:\/\/www.youtube.com\/watch?v=wymMn-SmALY\">la supernova<\/a>&nbsp;devienne visible&nbsp;<a href=\"http:\/\/imgsrc.hubblesite.org\/hu\/db\/images\/hs-2015-08-e-print.jpg\">\u00e0 proximit\u00e9<\/a>&nbsp;au cours des prochaines ann\u00e9es.<\/p>\n\n\n\n<p>Traduction r\u00e9alis\u00e9e par : Didier Jamet&nbsp;:&nbsp;<a href=\"http:\/\/apod.nasa.gov\/apod\/ap150309.html\" target=\"_blank\" rel=\"noreferrer noopener\">lire le texte original<\/a><\/p>\n\n\n\n<p>Auteurs et \u00e9diteurs&nbsp;:&nbsp;<a href=\"http:\/\/antwrp.gsfc.nasa.gov\/htmltest\/rjn.html\" target=\"_blank\" rel=\"noreferrer noopener\">Robert Nemiroff<\/a>&nbsp;(<a href=\"http:\/\/www.phy.mtu.edu\/\">MTU<\/a>) &amp;&nbsp;<a href=\"http:\/\/antwrp.gsfc.nasa.gov\/htmltest\/jbonnell\/www\/bonnell.html\" target=\"_blank\" rel=\"noreferrer noopener\">Jerry Bonnell<\/a>&nbsp;(<a href=\"http:\/\/www.astro.umd.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\">UMCP<\/a>)<\/p>\n\n\n\n<p>Repr\u00e9sentant technique de la Nasa&nbsp;:&nbsp;<a href=\"mailto:jpn@grossc.gsfc.nasa.gov\" target=\"_blank\" rel=\"noreferrer noopener\">Jay Norris<\/a><\/p>\n\n\n\n<p>Un service de&nbsp;:&nbsp;<a href=\"http:\/\/science.gsfc.nasa.gov\/sed\/index.cfm?fuseAction=home.main&amp;&amp;navOrgCode=660\" target=\"_blank\" rel=\"noreferrer noopener\">ASD<\/a>&nbsp;de&nbsp;<a href=\"http:\/\/www.nasa.gov\/\" target=\"_blank\" rel=\"noreferrer noopener\">NASA<\/a>&nbsp;\/&nbsp;<a href=\"http:\/\/www.gsfc.nasa.gov\/\" target=\"_blank\" rel=\"noreferrer noopener\">GSFC<\/a>&nbsp;&amp;&nbsp;<a href=\"http:\/\/www.mtu.edu\/\" target=\"_blank\" rel=\"noreferrer noopener\">Michigan Tech. U.<\/a><\/p>\n\n\n\n<p>Voir \u00e9galement le tr\u00e8s bon article \u00e0 ce sujet dans le dernier CIEL et ESPACE<\/p>\n\n\n\n<p><\/p>\n<div class=\"pvc_clear\"><\/div><p id=\"pvc_stats_3310\" class=\"pvc_stats all  \" data-element-id=\"3310\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" role=\"img\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" viewBox=\"0 0 512 512\" class=\"svg-inline--fa fa-chart-bar fa-w-16 fa-2x\"><path fill=\"currentColor\" d=\"M396.8 352h22.4c6.4 0 12.8-6.4 12.8-12.8V108.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v230.4c0 6.4 6.4 12.8 12.8 12.8zm-192 0h22.4c6.4 0 12.8-6.4 12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p><div class=\"pvc_clear\"><\/div>","protected":false},"excerpt":{"rendered":"<p>APOD de Ciel des hommes&nbsp; 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