{"id":22227,"date":"2026-03-08T16:31:00","date_gmt":"2026-03-08T14:31:00","guid":{"rendered":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/?p=22227"},"modified":"2026-03-12T10:02:24","modified_gmt":"2026-03-12T08:02:24","slug":"entretien-nous-voulons-observer-dautres-flambees-detoiles-dans-lunivers-jeune","status":"publish","type":"post","link":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/2026\/03\/08\/entretien-nous-voulons-observer-dautres-flambees-detoiles-dans-lunivers-jeune\/","title":{"rendered":"[Entretien] \u00ab Nous voulons observer d\u2019autres flamb\u00e9es d\u2019\u00e9toiles dans l\u2019Univers jeune&nbsp;\u00bb"},"content":{"rendered":"<div class=\"paragraph\">\n<p><b>La Marseillaise :<\/b><b> Vous avez d\u00e9tect\u00e9 une concentration de galaxies poussi\u00e9reuses formant \u00e9norm\u00e9ment d\u2019\u00e9toiles dans l\u2019Univers jeune \u2013 un milliard d\u2019ann\u00e9es. C\u2019est inhabituel. Comment l\u2019expliquer ?<\/b><\/p>\n<p><b>Guilaine Lagache :<\/b> Nous pensons que c\u2019est li\u00e9 \u00e0 l\u2019environnement. La mati\u00e8re noire structure l\u2019Univers et des galaxies se forment \u00e0 l\u2019intersection des filaments de mati\u00e8re noire. Nous pensons que beaucoup de gaz arrive sur les galaxies par ces filaments, cr\u00e9ant un emballement qui forme beaucoup d\u2019\u00e9toiles. Pour l\u2019instant, nous ne voyons que les galaxies. Nous aimerions voir le gaz froid qui circule dans les filaments.<\/p>\n<p><b>Quelle est la prochaine \u00e9tape ?<\/b><\/p>\n<p><b>G.L. :<\/b> Nous voulons observer d\u2019autres concentrations de galaxies formant beaucoup d\u2019\u00e9toiles dans l\u2019Univers jeune pour nous assurer que ce que nous avons vu n\u2019est pas un cas isol\u00e9. La cam\u00e9ra Nika2 a observ\u00e9 un autre endroit : le champ Cosmos. Parce qu\u2019il est plus grand, nous n\u2019avons pas atteint la m\u00eame sensibilit\u00e9 ultime que sur le champ GOODS-North. Mais peu importe\u00a0: nous avons besoin de champs de diff\u00e9rentes tailles observ\u00e9s avec des sensibilit\u00e9s diff\u00e9rentes.<\/p>\n<p><b>Pourrait-on remonter dans l\u2019Univers encore <br \/>plus jeune ?<\/b><\/p>\n<p><b>G.L. :<\/b> C\u2019est difficile avec la cam\u00e9ra Nika2 et le t\u00e9lescope de 30\u00a0m\u00e8tres de l\u2019Iram car nous avons atteint la limite ultime de sensibilit\u00e9. Pour la d\u00e9passer et observer des \u00e9missions millim\u00e9triques encore plus faibles \u2013car plus elles viennent de l\u2019Univers jeune, plus elles viennent de loin\u2013, il faudrait utiliser des interf\u00e9rom\u00e8tres. Or, ils ne sont pas adapt\u00e9s \u00e0 ce type d\u2019observation.<\/p>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"La Marseillaise : Vous avez d&eacute;tect&eacute; une concentration de galaxies poussi&eacute;reuses formant &eacute;norm&eacute;ment d&rsquo;&eacute;toiles dans l&rsquo;Univers jeune &ndash; un milliard d&rsquo;ann&eacute;es. C&rsquo;est &#8230;","protected":false},"author":1,"featured_media":22228,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3926,3925,1866],"tags":[],"news-destination":[3944],"news-source":[475],"is_homepage":[],"ta_other":[],"class_list":["post-22227","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-accueil-merge","category-accueil-third","category-loisirs","news-destination-homepage","news-source-website"],"_links":{"self":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/22227","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/comments?post=22227"}],"version-history":[{"count":1,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/22227\/revisions"}],"predecessor-version":[{"id":22229,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/posts\/22227\/revisions\/22229"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media\/22228"}],"wp:attachment":[{"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/media?parent=22227"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/categories?post=22227"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/tags?post=22227"},{"taxonomy":"news-destination","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-destination?post=22227"},{"taxonomy":"news-source","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/news-source?post=22227"},{"taxonomy":"is_homepage","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/is_homepage?post=22227"},{"taxonomy":"ta_other","embeddable":true,"href":"https:\/\/euapp01.newsmemory.com\/lamarseillaise\/news\/wp-json\/wp\/v2\/ta_other?post=22227"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}