{"id":84727,"date":"2024-04-16T17:21:21","date_gmt":"2024-04-16T17:21:21","guid":{"rendered":"https:\/\/www.africa-press.net\/burkina-faso\/politique\/un-trou-noir-atypique-debusque-dans-la-voie-lactee"},"modified":"2024-04-16T18:48:02","modified_gmt":"2024-04-16T18:48:02","slug":"un-trou-noir-atypique-debusque-dans-la-voie-lactee","status":"publish","type":"post","link":"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/un-trou-noir-atypique-debusque-dans-la-voie-lactee","title":{"rendered":"Un trou noir atypique d\u00e9busqu\u00e9 dans la Voie lact\u00e9e"},"content":{"rendered":"<p><span style=\"color: #ff6600\"><strong>Africa-Press &#8211; Burkina Faso. <\/strong><\/span>Le te\u0301lescope spatial europe\u0301en Gaia, de\u0301die\u0301 a\u0300 la cartographie de la Voie lacte\u0301e, a de\u0301couvert un trou noir d&rsquo;une masse record, de 33 fois celle du Soleil: du jamais vu dans notre galaxie, indique une e\u0301tude parue mardi.<\/p>\n<p>L&rsquo;objet baptise\u0301 Gaia BH3, situe\u0301 a\u0300 2.000 anne\u0301es-lumie\u0300re de la Terre, dans la constellation de l&rsquo;Aigle, appartient a\u0300 la famille des trous noirs stellaires qui re\u0301sultent de l&rsquo;effondrement d&rsquo;e\u0301toiles massives en fin de vie. Ils sont incomparablement plus petits que les trous noirs supermassifs loge\u0301s au c\u0153ur des galaxies, dont le sce\u0301nario de formation n&rsquo;est pas connu.<\/p>\n<p>C&rsquo;est \u00ab\u00a0par hasard\u00a0\u00bb que Gaia BH3 a e\u0301te\u0301 de\u0301niche\u0301, raconte a\u0300 l&rsquo;AFP Pasquale Panuzzo, chercheur CNRS a\u0300 l&rsquo;Observatoire de Paris-PSL, principal auteur des travaux publie\u0301s dans Astronomy &amp; Astrophysics Letters.<\/p>\n<p>Les scientifiques du consortium Gaia e\u0301taient en train de de\u0301fricher les dernie\u0300res donne\u0301es de la sonde, en vue de la publication du prochain catalogue en 2025, lorsqu&rsquo;ils sont tombe\u0301s sur un syste\u0300me d&rsquo;e\u0301toiles binaires particulier.<\/p>\n<p>\u00ab\u00a0On voyait une e\u0301toile un peu plus petite que le Soleil (75% de sa masse environ) et plus brillante, qui tournait autour d&rsquo;un compagnon invisible\u00a0\u00bb, repe\u0301rable par les perturbations qu&rsquo;il lui fait subir, raconte Pasquale Panuzzo, responsable-adjoint du traitement spectroscopique de Gaia.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" width=\"768\" height=\"542\" class=\"alignnone wp-image-84725 size-full\" src=\"https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1713280556.105595.jpg\" srcset=\"https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1713280556.105595.jpg 768w, https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1713280556.105595-300x212.jpg 300w, https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1713280556.105595-100x70.jpg 100w\" sizes=\"auto, (max-width: 768px) 100vw, 768px\" \/><br \/>\nLe te\u0301lescope spatial donne la position tre\u0300s pre\u0301cise des e\u0301toiles dans le ciel, les astronomes ont donc pu caracte\u0301riser les orbites et mesurer la masse du compagnon invisible de l&rsquo;e\u0301toile: 33 fois celle du Soleil.<\/p>\n<p>Des observations plus pousse\u0301es de te\u0301lescopes au sol ont confirme\u0301 qu&rsquo;il s&rsquo;agissait bien d&rsquo;un trou noir, d&rsquo;une masse bien plus importante que celle des trous noirs d&rsquo;origine stellaire de\u0301ja\u0300 connus dans la Voie lacte\u0301e &#8211; entre 10 et 20 masses solaires.<\/p>\n<p>De tels mastodontes ont de\u0301ja\u0300 e\u0301te\u0301 de\u0301tecte\u0301s dans des galaxies lointaines, via les ondes gravitationnelles. Mais \u00ab\u00a0jamais dans la no\u0302tre\u00a0\u00bb, dit le Dr Panuzzo.<\/p>\n<p><b>&#8211; Trou noir dormant &#8211;<\/b><\/p>\n<p>Gaia BH3 est un trou noir \u00ab\u00a0dormant\u00a0\u00bb: il est trop e\u0301loigne\u0301 de son e\u0301toile compagnon pour lui arracher sa matie\u0300re et n&rsquo;e\u0301met donc aucun rayonnement X, ce qui rend sa de\u0301tection extre\u0302mement difficile.<\/p>\n<p>Le te\u0301lescope Gaia a re\u0301ussi a\u0300 de\u0301busquer les deux premiers trous noirs inactifs (Gaia BH1 et Gaia BH2) de la Voie lacte\u0301e, mais ceux-ci ont des masses standard.<\/p>\n<p>Contrairement au Soleil, la petite e\u0301toile du syste\u0300me binaire de BH3 est \u00ab\u00a0tre\u0300s pauvre en e\u0301le\u0301ments plus lourds que l&rsquo;hydroge\u0300ne et l&rsquo;he\u0301lium\u00a0\u00bb, explique l&rsquo;Observatoire de Paris dans un communique\u0301.<\/p>\n<p>\u00ab\u00a0Selon la the\u0301orie, seules ces e\u0301toiles pauvres en me\u0301taux peuvent former un trou noir aussi massif\u00a0\u00bb, rele\u0300ve le Dr Panuzzo. L&rsquo;e\u0301tude sugge\u0300re donc que le \u00ab\u00a0proge\u0301niteur\u00a0\u00bb du trou noir e\u0301tait une e\u0301toile massive elle aussi pauvre en me\u0301taux.<\/p>\n<p>L&rsquo;e\u0301toile du syste\u0300me, a\u0302ge\u0301e de 12 milliards d&rsquo;anne\u0301es, \u00ab\u00a0vieillit tre\u0300s lentement\u00a0\u00bb, quand celle qui a forme\u0301 le trou noir \u00ab\u00a0n&rsquo;a ve\u0301cu que 3 millions d&rsquo;anne\u0301es\u00a0\u00bb, de\u0301crit-il.<\/p>\n<p>\u00ab\u00a0Ces e\u0301toiles pauvres en me\u0301taux e\u0301taient tre\u0300s pre\u0301sentes au de\u0301but de la galaxie. Leur e\u0301tude nous donne des informations sur sa formation\u00a0\u00bb, ajoute le scientifique.<\/p>\n<p>Autre curiosite\u0301 du couple stellaire: dans le disque de la Voie lacte\u0301e, il tourne dans le sens contraire des autres e\u0301toiles. \u00ab\u00a0Peut-e\u0302tre parce que le trou noir se serait forme\u0301 dans une autre galaxie plus petite, qui aurait e\u0301te\u0301 mange\u0301e au de\u0301but de la vie de la Voie lacte\u0301e\u00a0\u00bb, avance-t-il.<\/p>\n<p>La sonde Gaia de l&rsquo;ESA (agence spatiale europe\u0301enne), qui ope\u0300re a\u0300 1,5 million de kilome\u0300tres de la Terre depuis 10 ans, a livre\u0301 en 2022 une carte en 3D des positions et des mouvements de plus d&rsquo;1,8 milliard d&rsquo;e\u0301toiles.<\/p>\n<p><strong>Pour plus d&rsquo;informations et d&rsquo;analyses sur la <a href=\"https:\/\/www.africa-press.net\/burkina-faso\">Burkina Faso<\/a>, suivez <a href=\"https:\/\/www.africa-press.net\/\">Africa-Press<\/a><\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Africa-Press &#8211; Burkina Faso. Le te\u0301lescope spatial europe\u0301en Gaia, de\u0301die\u0301 a\u0300 la cartographie de la Voie lacte\u0301e, a de\u0301couvert un trou noir d&rsquo;une masse record, de 33 fois celle du Soleil: du jamais vu dans notre galaxie, indique une e\u0301tude parue mardi. L&rsquo;objet baptise\u0301 Gaia BH3, situe\u0301 a\u0300 2.000 anne\u0301es-lumie\u0300re de la Terre, dans la [&hellip;]<\/p>\n","protected":false},"author":82,"featured_media":84726,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,10],"tags":[111,725,29],"class_list":["post-84727","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-divers","category-toutes-les-actualites","tag-africa-press","tag-africa-press-burkina-faso","tag-burkina-faso"],"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>Un trou noir atypique d\u00e9busqu\u00e9 dans la Voie lact\u00e9e - Burkina Faso<\/title>\n<meta name=\"description\" content=\"Le te\u0301lescope spatial europe\u0301en Gaia, de\u0301die\u0301 a\u0300 la cartographie de la Voie lacte\u0301e, a de\u0301couvert un trou noir d&#039;une mas ...\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/un-trou-noir-atypique-debusque-dans-la-voie-lactee\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Un trou noir atypique d\u00e9busqu\u00e9 dans la Voie lact\u00e9e\" \/>\n<meta property=\"og:description\" content=\"Le te\u0301lescope spatial europe\u0301en Gaia, de\u0301die\u0301 a\u0300 la cartographie de la Voie lacte\u0301e, a de\u0301couvert un trou noir d&#039;une mas ...\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/un-trou-noir-atypique-debusque-dans-la-voie-lactee\" \/>\n<meta property=\"og:site_name\" content=\"Burkina Faso\" \/>\n<meta property=\"article:published_time\" content=\"2024-04-16T17:21:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2024-04-16T18:48:02+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1713280571.543292.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"900\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"cfeditorfr\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"cfeditorfr\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/un-trou-noir-atypique-debusque-dans-la-voie-lactee#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/un-trou-noir-atypique-debusque-dans-la-voie-lactee\"},\"author\":{\"name\":\"cfeditorfr\",\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/#\/schema\/person\/2b1cf3cd81a31e3cd26889ca66d677f1\"},\"headline\":\"Un trou noir atypique d\u00e9busqu\u00e9 dans la Voie lact\u00e9e\",\"datePublished\":\"2024-04-16T17:21:21+00:00\",\"dateModified\":\"2024-04-16T18:48:02+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/un-trou-noir-atypique-debusque-dans-la-voie-lactee\"},\"wordCount\":715,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/un-trou-noir-atypique-debusque-dans-la-voie-lactee#primaryimage\"},\"thumbnailUrl\":\"https:\/\/static.africa-press.net\/burkina\/sites\/42\/2024\/04\/sm_1713280571.543292.jpg\",\"keywords\":[\"Africa Press\",\"Africa Press-Burkina Faso\",\"Burkina Faso\"],\"articleSection\":[\"Divers\",\"Toutes les actualit\u00e9s\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/un-trou-noir-atypique-debusque-dans-la-voie-lactee#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/un-trou-noir-atypique-debusque-dans-la-voie-lactee\",\"url\":\"https:\/\/www.africa-press.net\/burkina-faso\/toutes-les-actualites\/un-trou-noir-atypique-debusque-dans-la-voie-lactee\",\"name\":\"Un trou noir atypique d\u00e9busqu\u00e9 dans la Voie lact\u00e9e - 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