{"id":987869,"date":"2020-12-29T06:57:21","date_gmt":"2020-12-29T05:57:21","guid":{"rendered":"https:\/\/www.tomsguide.fr\/?p=987869"},"modified":"2023-06-12T19:37:30","modified_gmt":"2023-06-12T17:37:30","slug":"espace-un-jet-de-blazar-massif-a-ete-observe-datant-des-jeunes-annees-de-lunivers","status":"publish","type":"post","link":"https:\/\/www.tomsguide.fr\/espace-un-jet-de-blazar-massif-a-ete-observe-datant-des-jeunes-annees-de-lunivers\/","title":{"rendered":"Espace : un jet de blazar massif a \u00e9t\u00e9 observ\u00e9, datant des jeunes ann\u00e9es de l&#8217;Univers"},"content":{"rendered":"\n<p>Il y a 13 milliards d\u2019ann\u00e9es, un blazar \u00e9mettait un \u00e9norme jet radioactif compos\u00e9 de rayons gamma. Ce jet est aujourd\u2019hui observable, et une \u00e9quipe de chercheurs de l\u2019universit\u00e9 de Bologne en Italie a pu observer son comportement pour en savoir plus sur ces ph\u00e9nom\u00e8nes dont on sait encore peu de choses.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"800\" height=\"450\" src=\"https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2020\/12\/20201229-blazar-espace.jpg\" alt=\"Cr\u00e9dits : Spingola et al.; Bill Saxton, NRAO\/AUI\/NSF.\" class=\"wp-image-987870\" srcset=\"https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2020\/12\/20201229-blazar-espace.jpg 800w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2020\/12\/20201229-blazar-espace-300x169.jpg 300w, https:\/\/www.tomsguide.fr\/content\/uploads\/sites\/2\/2020\/12\/20201229-blazar-espace-768x432.jpg 768w\" sizes=\"(max-width: 800px) 100vw, 800px\" \/><figcaption>Cr\u00e9dits : Spingola et al.; Bill Saxton, NRAO\/AUI\/NSF.<\/figcaption><\/figure>\n\n\n\n<p>L\u2019\u00e9tude de l\u2019\u00e9quipe de chercheurs a \u00e9t\u00e9 publi\u00e9e dans Astronomy &amp; Astrophysics. Les scientifiques ont utilis\u00e9 le r\u00e9seau de t\u00e9lescopes VLBA pour observer le ph\u00e9nom\u00e8ne. Le but \u00e9tait d&#8217;<strong>en apprendre plus sur le comportement des blazars<\/strong>. Les observations ont r\u00e9v\u00e9l\u00e9 des d\u00e9tails in\u00e9dits sur le blazar, en train de projeter ses \u00e9missions lumineuses en direction de la Terre.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La blazar envoie un jet radioactif, expuls\u00e9 d\u2019un trou noir supermassif<\/h2>\n\n\n\n<p>L\u2019image montre le blazar en bas \u00e0 droite, en train d\u2019\u00e9mettre des rayons-X depuis le centre de la galaxie. Le jet est projet\u00e9 par la force gravitationnelle du <a aria-label=\"undefined (s\u2019ouvre dans un nouvel onglet)\" href=\"https:\/\/www.tomsguide.fr\/le-trou-noir-supermassif-au-centre-de-la-voie-lactee-nous-fait-de-loeil\/\" target=\"_blank\" rel=\"noreferrer noopener\">trou noir supermassif situ\u00e9 au centre de la galaxie,<\/a> se d\u00e9pla\u00e7ant vers la partie sup\u00e9rieure gauche de la photo. La vitesse de projection de ces jets est vertigineuse. <strong>La longueur totale de ce jet est d\u2019environ 1600 ann\u00e9es lumi\u00e8res<\/strong>. Ce type de noyaux de galaxies est appel\u00e9 \u00ab\u00a0galaxies actives\u00a0\u00bb. Le trou noir cr\u00e9\u00e9 un anneau de mati\u00e8re autour du centre du blazar, qui l\u2019expulse p\u00e9riodiquement.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Une observation qui va permettre d\u2019en apprendre plus sur la jeunesse de l\u2019Univers<\/h2>\n\n\n\n<p>L\u2019\u00e9quipe de chercheur, men\u00e9e par la scientifique italienne Cristiana Spingola, a effectu\u00e9 plusieurs observations plus t\u00f4t cette ann\u00e9e. Le but \u00e9tait de comprendre <strong>pourquoi si peu de blazars se formaient aux d\u00e9buts de l\u2019Univers<\/strong>. \u00ab Parmi les diff\u00e9rents sc\u00e9narios, cette discordance pourrait \u00eatre due au fait que les blazars \u00e9loign\u00e9s ont des propri\u00e9t\u00e9s diff\u00e9rentes de la population locale de blazars, comme le jet qui se d\u00e9place plus lentement que ce qu\u2019on observe localement. C&#8217;est ce que sugg\u00e8rent nos r\u00e9sultats. Si cela \u00e9tait confirm\u00e9, nous aurions d\u00e9couvert que les blazars locaux et \u00e9loign\u00e9s sont des b\u00eates diff\u00e9rentes.\u00a0\u00bb a \u00e9crit Cristiana Spingola dans un e-mail. Si ces r\u00e9sultats se confirment, les blazars lointains seront donc prouv\u00e9s comme ayant des propri\u00e9t\u00e9s diff\u00e9rentes.<\/p>\n\n\n\n<p>D\u2019apr\u00e8s la scientifique italienne, \u00ab Nous savons tr\u00e8s peu le jeune Univers, donc toute nouvelle information est cruciale pour mieux comprendre cette \u00e9poque. \u00bb Encore un pas en avant vers la connaissance de notre Univers.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/www.tomsguide.fr\/la-terre-est-2000-annees-lumiere-plus-proche-du-trou-noir-de-la-voie-lactee-que-nous-le-pensions\/\" target=\"_blank\" aria-label=\"undefined (s\u2019ouvre dans un nouvel onglet)\" rel=\"noreferrer noopener\">La Terre est 2000 ann\u00e9es-lumi\u00e8re plus proche du trou noir de la Voie lact\u00e9e que nous le pensions<\/a><\/strong><\/p>\n\n\n\n<p>Source&nbsp;: <a href=\"https:\/\/gizmodo.com\/a-massive-radioactive-jet-from-the-early-universe-has-b-1845957727\">Gizmodo<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Les blazars font partie des objets les plus puissants et les plus violents de l\u2019Univers.<\/p>","protected":false},"author":82,"featured_media":987870,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ep_exclude_from_search":false,"footnotes":""},"categories":[494,3872],"tags":[],"hubs":[],"acf":{"display_mode":"medium-img","post_show_excerpt":true,"post_source":"","hide_sidebar":false,"hide_advertising":false},"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v22.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Espace : un jet de blazar massif a \u00e9t\u00e9 observ\u00e9, datant des jeunes ann\u00e9es de l&#039;Univers<\/title>\n<meta name=\"description\" content=\"Les blazars font 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