{"id":11954,"date":"2023-04-28T17:00:39","date_gmt":"2023-04-28T17:00:39","guid":{"rendered":"https:\/\/www.africa-press.net\/djibouti\/politique\/trou-noir-voici-la-premiere-image-de-lexpulsion-dun-jet-de-matiere-un-phenomene-impressionnant"},"modified":"2023-04-28T18:46:40","modified_gmt":"2023-04-28T18:46:40","slug":"trou-noir-voici-la-premiere-image-de-lexpulsion-dun-jet-de-matiere-un-phenomene-impressionnant","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/djibouti\/toutes-les-actualites\/trou-noir-voici-la-premiere-image-de-lexpulsion-dun-jet-de-matiere-un-phenomene-impressionnant","title":{"rendered":"Trou noir\u00a0: voici la premi\u00e8re image de l&rsquo;expulsion d&rsquo;un jet de mati\u00e8re, un ph\u00e9nom\u00e8ne impressionnant"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Djibouti. <\/strong><\/span>Le trou noir supermassif M87* continue de faire parler de lui. En avril 2019, les premie\u0300res images de cet astre de 6,5 milliards de masses solaires situe\u0301s a\u0300 55 millions d\u2019anne\u0301es-lumie\u0300re de nous avaient e\u0301mu le monde entier. Elle avait e\u0301te\u0301 re\u0301alise\u0301e par l\u2019Event Horizon Telescope (EHT), un re\u0301seau de radiote\u0301lescopes re\u0301partis dans le monde entier. Quatre ans plus tard, M87* est encore a\u0300 l\u2019origine d\u2019une premie\u0300re : les astrophysiciens ont pu voir le puissant jet de matie\u0300re qui s\u2019e\u0301chappe du trou noir, et la manie\u0300re dont il est relie\u0301 a\u0300 celui-ci. \u00ab\u00a0Nous savons que des jets sont e\u0301jecte\u0301s de la re\u0301gion entourant les trous noirs, explique Ru-Sen Lu, de l&rsquo;Observatoire Astronomique de Shanghai, en Chine sur le site de l\u2019ESO, mais nous ne comprenons pas encore tout a\u0300 fait comment cela se produit. Pour l&rsquo;e\u0301tudier directement, nous devons observer l&rsquo;origine du jet au plus pre\u0300s du trou noir.\u00a0\u00bb<\/p>\n<p><b>Le jet de matie\u0300re s&rsquo;e\u0301tend sur au-moins 5000 anne\u0301es-lumie\u0300re<\/b><\/p>\n<p>Le jet se forme au niveau du disque d\u2019accre\u0301tion, un disque de matie\u0300re ionise\u0301e en rotation tre\u0300s rapide autour du trou noir dans lequel elle est condamne\u0301e a\u0300 disparai\u0302tre. La longueur de ce jet qui suit l&rsquo;axe de rotation du trou noir serait d\u2019au moins 5000 anne\u0301es-lumie\u0300re, une distance conside\u0301rable correspondant a\u0300 1\/10e du rayon de la Voie lacte\u0301e. L&rsquo;image a e\u0301te\u0301 obtenue avec le GMVA (Global Millimetre VLBI Array), ALMA (Atacama Large Millimeter\/subimeter Array) et le GLT (Greenland Telescope), formant un re\u0301seau de radiote\u0301lescopes autour du globe. La combinaison de leurs images par la technique de l&rsquo;interfe\u0301rome\u0301trie permet de simuler un te\u0301lescope dont le miroir aurait la taille de la Terre. Les mesures ont e\u0301te\u0301 faites en 2018, mais il a fallu quatre ans de travail pour les exploiter.<\/p>\n<p><b>Comprendre la physique autour d&rsquo;un trou noir<\/b><\/p>\n<p>Cette photo est 50 % plus grande que la pre\u0301ce\u0301dente fournie en 2019 par l\u2019EHT. Par ailleurs, les astrophysiciens ont travaille\u0301 a\u0300 une longueur d\u2019onde le\u0301ge\u0300rement diffe\u0301rente, 3,5 mm au lieu de 1,5 mm. \u00ab\u00a0A\u0300 cette longueur d&rsquo;onde, nous pouvons voir comment le jet e\u0301merge de l&rsquo;anneau d&rsquo;e\u0301mission autour du trou noir supermassif central\u00a0\u00bb, explique Thomas Krichbaum de l&rsquo;Institut Max Planck. M87* n\u2019a pas l\u2019exclusivite\u0301 de ce type de jet, d\u2019ou\u0300 la ne\u0301cessite\u0301 pour les chercheurs de comprendre pre\u0301cise\u0301ment le lien entre la matie\u0300re martyrise\u0301e s\u2019approchant de l\u2019horizon du trou noir, et l\u2019expulsion de matie\u0300re a\u0300 des vitesses proches de celles de la lumie\u0300re. \u00ab\u00a0Nous pre\u0301voyons d&rsquo;observer la re\u0301gion autour du trou noir au centre de M87* a\u0300 diffe\u0301rentes longueurs d&rsquo;onde radio afin d&rsquo;e\u0301tudier plus en de\u0301tail l&rsquo;e\u0301mission du jet\u00a0\u00bb, explique Eduardo Ros de l&rsquo;Institut Max Planck. Au-dela\u0300 des images, il s\u2019agit de comprendre la physique qui est en jeu, une physique force\u0301ment passionnante a\u0300 proximite\u0301 d\u2019un trou noir.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/djibouti\">Djibouti<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Djibouti. Le trou noir supermassif M87* continue de faire parler de lui. En avril 2019, les premie\u0300res images de cet astre de 6,5 milliards de masses solaires situe\u0301s a\u0300 55 millions d\u2019anne\u0301es-lumie\u0300re de nous avaient e\u0301mu le monde entier. Elle avait e\u0301te\u0301 re\u0301alise\u0301e par l\u2019Event Horizon Telescope (EHT), un re\u0301seau de radiote\u0301lescopes re\u0301partis [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":11953,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[36,49,50],"class_list":["post-11954","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-djibouti","tag-djibouti"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.1 (Yoast SEO v27.0) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Trou noir\u00a0: voici la premi\u00e8re image de l&#039;expulsion d&#039;un jet de mati\u00e8re, un ph\u00e9nom\u00e8ne impressionnant - Djibouti<\/title>\n<meta name=\"description\" content=\"Le trou noir supermassif M87* continue de faire parler de lui. 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