{"id":113698,"date":"2026-03-18T19:15:41","date_gmt":"2026-03-18T19:15:41","guid":{"rendered":"https:\/\/www.africa-press.net\/cotedivoire\/politique\/neutrino-energetique-provenant-dun-blazar"},"modified":"2026-03-22T13:12:33","modified_gmt":"2026-03-22T13:12:33","slug":"neutrino-energetique-provenant-dun-blazar","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/cotedivoire\/toutes-les-actualites\/neutrino-energetique-provenant-dun-blazar","title":{"rendered":"Neutrino \u00c9nerg\u00e9tique Provenant d&rsquo;un Blazar"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. <\/strong><\/span>Blazar? Blazar? J\u2019ai dit blazar? Comme c\u2019est blazar&#8230;\u00a0\u00bb Derrie\u0300re ce clin d\u2019\u0153il a\u0300 la ce\u0301le\u0300bre re\u0301plique de Louis Jouvet dans Dro\u0302le de drame se cache peut-e\u0302tre la solution de l\u2019e\u0301nigme du neutrino le plus e\u0301nerge\u0301tique jamais de\u0301tecte\u0301. En effet, un de ces fameux blazars, un type particulier de galaxie, pourrait bien e\u0302tre a\u0300 l\u2019origine de KM3-230213A, cet e\u0301ve\u0301nement astrophysique exceptionnel dont les scientifiques ne se sont toujours pas remis. En fe\u0301vrier 2023, le te\u0301lescope sous-marin KM3NeT, installe\u0301 au fond de la Me\u0301diterrane\u0301e, a enregistre\u0301 un neutrino d\u2019une e\u0301nergie estime\u0301e a\u0300 environ 220 pe\u0301tae\u0301lectronvolts (PeV), le plus e\u0301nerge\u0301tique jamais observe\u0301.<\/p>\n<p>Une de\u0301couverte spectaculaire qui pose d\u2019emble\u0301e la question de son origine. Quel monstre cosmique a bien pu produire une particule aussi extre\u0302me? Depuis trois ans, les chercheurs rivalisent d\u2019hypothe\u0300ses plus ou moins audacieuses. Certains invoquent des neutrinos cosmologiques, produits lorsque les rayons cosmiques ultra-e\u0301nerge\u0301tiques interagissent avec la lumie\u0300re fossile de l\u2019Univers. D\u2019autres e\u0301voquent des sce\u0301narios plus spe\u0301culatifs, comme l\u2019e\u0301vaporation d\u2019un trou noir primordial.<\/p>\n<p><b>Une usine a\u0300 neutrinos cosmiques<\/b><\/p>\n<p>Une nouvelle e\u0301tude parue dans la revue Journal of Cosmology and Astroparticle Physics propose donc la piste des blazars. Le terme a e\u0301te\u0301 forge\u0301 a\u0300 la fin des anne\u0301es 1970 a\u0300 partir de BL Lac et quasar, deux types de galaxies particulie\u0300rement spectaculaires. Ces objets comptent parmi les plus e\u0301nerge\u0301tiques de l\u2019Univers. En leur c\u0153ur se trouve un trou noir supermassif qui engloutit la matie\u0300re environnante. Mais une partie de cette matie\u0300re n\u2019est pas avale\u0301e: elle est e\u0301jecte\u0301e sous forme de deux jets de plasma projete\u0301s dans l\u2019espace a\u0300 des vitesses proches de celle de la lumie\u0300re.<\/p>\n<p>Dans le cas des blazars, l\u2019un de ces jets est oriente\u0301 vers la Terre et la galaxie apparai\u0302t alors extraordinairement brillante, notamment dans les rayons gamma. Dans ces jets, les conditions sont si extre\u0302mes que les particules peuvent atteindre des e\u0301nergies gigantesques. Des protons ultra-e\u0301nerge\u0301tiques entrent alors en collision avec des photons pre\u0301sents dans le jet. Cette interaction produit des particules instables appele\u0301es pions. Or ces pions se de\u0301sinte\u0300grent presque imme\u0301diatement: certains donnent naissance a\u0300 des rayons gamma, d\u2019autres a\u0300 des neutrinos. C\u2019est ainsi que les blazars pourraient agir comme de ve\u0301ritables usines a\u0300 neutrinos cosmiques.<\/p>\n<p><b>Qu&rsquo;est-ce qu&rsquo;un neutrino?<\/b><\/p>\n<p>Le neutrino est l\u2019une des particules les plus myste\u0301rieuses de la physique. Pre\u0301dit en 1930 par le physicien Wolfgang Pauli et de\u0301tecte\u0301 pour la premie\u0300re fois en 1956, il appartient a\u0300 la famille des leptons, comme l\u2019e\u0301lectron. Mais contrairement a\u0300 ce dernier, il ne posse\u0300de aucune charge e\u0301lectrique et sa masse est extre\u0302mement faible. La particularite\u0301 du neutrino est surtout son extraordinaire discre\u0301tion: il interagit tre\u0300s rarement avec la matie\u0300re. Chaque seconde, des milliards de neutrinos traversent notre corps sans laisser la moindre trace. La plupart proviennent du Soleil, d\u2019autres sont produits dans les re\u0301actions nucle\u0301aires, les explosions d\u2019e\u0301toiles ou les collisions de rayons cosmiques dans l\u2019atmosphe\u0300re.<\/p>\n<p><b>Des neutrinos tre\u0300s puissants et tre\u0300s rares<\/b><\/p>\n<p>Pour tester cette ide\u0301e, les chercheurs ont d\u2019abord mode\u0301lise\u0301 l\u2019e\u0301mission de neutrinos et de rayons gamma par un blazar typique, avant d\u2019extrapoler leurs re\u0301sultats a\u0300 l\u2019ensemble des blazars de l\u2019Univers. Leur objectif: de\u0301terminer si ces objets peuvent produire des neutrinos de plusieurs centaines de pe\u0301tae\u0301lectronvolts \u2014 et surtout si ce sce\u0301nario reste compatible avec les observations re\u0301alise\u0301es par les diffe\u0301rents de\u0301tecteurs de neutrinos et de rayons gamma. Avec un fait e\u0301trange: a\u0300 ce jour, un seul neutrino de cette e\u0301nergie a e\u0301te\u0301 de\u0301tecte\u0301.<\/p>\n<p>Si les blazars sont nombreux dans l\u2019Univers et capables de produire ces super-neutrinos, pourquoi ces particules sont-elles si rarement observe\u0301es? La re\u0301ponse tient dans un e\u0301quilibre de\u0301licat entre la puissance de ces sources de neutrinos et la sensibilite\u0301 encore limite\u0301e des de\u0301tecteurs. Les chercheurs ont donc calcule\u0301 le flux de neutrinos que l\u2019ensemble des blazars de l\u2019Univers devrait produire. Puis ils ont estime\u0301 combien de ces particules ultra-e\u0301nerge\u0301tiques devraient parvenir jusqu\u2019a\u0300 la Terre \u2014 et a\u0300 quelle fre\u0301quence un instrument comme KM3NeT ou IceCube, le gigantesque de\u0301tecteur de neutrinos enfoui dans la glace de l\u2019Antarctique, devrait en de\u0301tecter une.<\/p>\n<p><b>Un messager des milieux extre\u0302mes<\/b><\/p>\n<p>Leurs re\u0301sultats montrent que les blazars pourraient bien produire des neutrinos atteignant plusieurs centaines de pe\u0301tae\u0301lectronvolts, mais le flux attendu a\u0300 ces e\u0301nergies est extre\u0302mement faible. La probabilite\u0301 qu&rsquo;un de ces neutrinos atteignent la Terre et soit de\u0301tecte\u0301 serait donc extre\u0302mement faible, mais pas impossible. D&rsquo;ou\u0300 la de\u0301tection unique de 2023. Si cette hypothe\u0300se se confirme, les blazars pourraient bien e\u0302tre parmi les acce\u0301le\u0301rateurs de particules les plus puissants du cosmos.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <span style=\"color: #ff6600\">C\u00f4te d&rsquo;Ivoire<\/span>, suivez <span style=\"color: #ff6600\">Africa-Press<\/span><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; C\u00f4te d&rsquo;Ivoire. Blazar? Blazar? J\u2019ai dit blazar? Comme c\u2019est blazar&#8230;\u00a0\u00bb Derrie\u0300re ce clin d\u2019\u0153il a\u0300 la ce\u0301le\u0300bre re\u0301plique de Louis Jouvet dans Dro\u0302le de drame se cache peut-e\u0302tre la solution de l\u2019e\u0301nigme du neutrino le plus e\u0301nerge\u0301tique jamais de\u0301tecte\u0301. En effet, un de ces fameux blazars, un type particulier de galaxie, pourrait bien [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":113697,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[29],"class_list":["post-113698","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-cote-divoire"],"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>Neutrino \u00c9nerg\u00e9tique Provenant d&#039;un Blazar - C\u00f4te d&#039;Ivoire<\/title>\n<meta name=\"description\" content=\"Blazar? Blazar? J\u2019ai dit blazar? 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Blazar? J\u2019ai dit blazar? 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