{"id":11,"date":"2013-12-04T12:45:49","date_gmt":"2013-12-04T09:45:49","guid":{"rendered":"http:\/\/www.energy-sciences.org\/energy\/2013\/12\/04\/phenomene-rare-un-trou-noir-supermassif-avale-une-etoile\/"},"modified":"2013-12-04T12:45:49","modified_gmt":"2013-12-04T09:45:49","slug":"phenomene-rare-un-trou-noir-supermassif-avale-une-etoile","status":"publish","type":"post","link":"https:\/\/www.energy-sciences.org\/sciences\/phenomene-rare-un-trou-noir-supermassif-avale-une-etoile\/","title":{"rendered":"Ph\u00e9nom\u00e8ne rare : un trou noir supermassif avale une \u00e9toile"},"content":{"rendered":"<p><a href=\"..\/energy-sciences\/index.php\/component\/mailto\/?tmpl=component&amp;link=a42a02f42fe897d9aacc3a870216e7f7538b20c6\" title=\"Envoyer\"><img decoding=\"async\" src=\"..\/energy-sciences\/templates\/science15\/images\/emailButton.png\" border=\"0\" alt=\"Envoyer\" \/><\/a><\/p>\n<div class=\"art-article\">\n<p><img decoding=\"async\" src=\"http:\/\/cache.20minutes.fr\/img\/photos\/20mn\/2011-12\/2011-12-05\/article_trou-noir.jpg\" border=\"0\" width=\"241\" height=\"124\" style=\"float: right; border: 2px solid black; margin: 2px;\" \/><\/p>\n<p style=\"text-align: justify;\">Des astronomes ont eu le rare privil\u00e8ge d&rsquo;<a class=\"lien_interne\" href=\"http:\/\/conjugaison.lemonde.fr\/conjugaison\/premier-groupe\/assister\" target=\"_blank\">assister<\/a> <em>\u00ab\u00a0en temps r\u00e9el\u00a0\u00bb<\/em> \u00e0 l&rsquo;aspiration par un trou noir supermassif d&rsquo;une \u00e9toile qui s&rsquo;approchait trop pr\u00e8s de lui. Selon les scientifiques, un tel ph\u00e9nom\u00e8ne ne survient en moyenne qu&rsquo;une fois tous les dix mille ans dans une galaxie donn\u00e9e.<\/p>\n<p style=\"text-align: justify;\"><em>\u00ab\u00a0Les trous noirs sont un peu comme les requins, on consid\u00e8re \u00e0 tort que ce sont de perp\u00e9tuelles machines \u00e0 <a class=\"lien_interne\" href=\"http:\/\/conjugaison.lemonde.fr\/conjugaison\/premier-groupe\/tuer\" target=\"_blank\">tuer<\/a>. En r\u00e9alit\u00e9, ils restent calmes durant la majeure<\/em><\/p>\n<p>  <!--more-->  <\/p>\n<p style=\"text-align: justify;\"><em>partie de leur vie. Mais occasionnellement, une \u00e9toile s&rsquo;<a class=\"lien_interne\" href=\"http:\/\/www.lemonde.fr\/voyage-aventure\/\">aventure<\/a> trop pr\u00e8s, et c&rsquo;est l\u00e0 que la fr\u00e9n\u00e9sie carnassi\u00e8re se d\u00e9clenche\u00a0\u00bb<\/em>, explique <a class=\"lien_interne\" href=\"http:\/\/www.lemonde.fr\/sujet\/3bac\/ryan-chornock.html\" target=\"_blank\">Ryan Chornock<\/a>, du centre d&rsquo;astrophysique Harvard-Smithsonian, coauteur de l&rsquo;\u00e9tude publi\u00e9e mercredi dans la revue <em>Nature<\/em>.<\/p>\n<p>\u00a0<\/p>\n<p style=\"text-align: justify;\">Des trous noirs supermassifs, d&rsquo;une masse comprise entre un million et un milliard de fois celle de notre Soleil, sont tapis au centre de la plupart des galaxies de l&rsquo;Univers. On peut en d\u00e9tecter certains gr\u00e2ce au rayonnement intense qu&rsquo;ils \u00e9mettent lorsqu&rsquo;ils aspirent des gaz situ\u00e9s dans leur voisinage. Mais si l&rsquo;environnement des trous noirs est pauvre en gaz, ce rayonnement est faible. Il est donc particuli\u00e8rement ardu d&rsquo;\u00e9tudier les trous noirs \u00ab\u00a0dormants\u00a0\u00bb, sauf \u00e0 les <a class=\"lien_interne\" href=\"http:\/\/conjugaison.lemonde.fr\/conjugaison\/troisieme-groupe\/surprendre\" target=\"_blank\">surprendre<\/a> en pleine action, ce que sont parvenus \u00e0 <a class=\"lien_interne\" href=\"http:\/\/conjugaison.lemonde.fr\/conjugaison\/troisieme-groupe\/faire\" target=\"_blank\">faire<\/a> Ryan Chornock et <a class=\"lien_interne\" href=\"http:\/\/www.lemonde.fr\/sujet\/9ee4\/suvi-gezari.html\" target=\"_blank\">Suvi Gezari<\/a>, de l&rsquo;universit\u00e9 am\u00e9ricaine <a class=\"lien_interne\" href=\"http:\/\/www.lemonde.fr\/sujet\/87ae\/johns-hopkins.html\" target=\"_blank\">Johns Hopkins<\/a>.<\/p>\n<p><strong>\u00ab\u00a0DIGESTION\u00a0\u00bb DU C\u0152UR D&rsquo;UNE G\u00c9ANTE ROUGE<br \/><\/strong><\/p>\n<p style=\"text-align: justify;\">Le 31 mai 2010, dans l&rsquo;objectif du t\u00e9lescope Pan-Starrs 1 \u00e0 Hawa\u00ef, ils ont d\u00e9couvert une lueur inattendue provenant du c\u0153ur d&rsquo;une galaxie situ\u00e9e \u00e0 2,7 milliards d&rsquo;ann\u00e9es-lumi\u00e8re. La lueur est devenue de plus en plus intense pour <a class=\"lien_interne\" href=\"http:\/\/conjugaison.lemonde.fr\/conjugaison\/troisieme-groupe\/atteindre\" target=\"_blank\">atteindre<\/a> son point culminant le 12 juillet, avant de s&rsquo;\u00e9vanouir progressivement. <em>\u00ab\u00a0Nous avons observ\u00e9 la fin d&rsquo;une \u00e9toile et sa digestion<\/em><em> par le trou noir en temps r\u00e9el\u00a0\u00bb<\/em>, explique <a class=\"lien_interne\" href=\"http:\/\/www.lemonde.fr\/sujet\/d41b\/edo-berger.html\" target=\"_blank\" style=\"text-decoration: none; cursor: text;\">Edo Berger<\/a>, qui a particip\u00e9 \u00e0 l&rsquo;\u00e9tude.<\/p>\n<p style=\"text-align: justify;\">Cette lueur \u00e9manait d&rsquo;un trou noir supermassif qui \u00e9tait jusqu&rsquo;alors \u00e0 l&rsquo;\u00e9tat \u00ab\u00a0dormant\u00a0\u00bb, une masse d&rsquo;environ trois millions de fois celle du Soleil, \u00e9quivalent \u00e0 celle du trou noir situ\u00e9 au centre de la <a class=\"lien_interne\" href=\"http:\/\/www.lemonde.fr\/sujet\/6059\/voie-lact.html\" target=\"_blank\">Voie Lact<\/a>\u00e9e, notre galaxie. L&rsquo;\u00e9toile engloutie par ce trou noir \u00e9tait tellement proche de lui que les <em>\u00ab\u00a0forces de mar\u00e9e\u00a0\u00bb<\/em> g\u00e9n\u00e9r\u00e9es par le champ de gravit\u00e9 du trou noir l&rsquo;ont litt\u00e9ralement d\u00e9membr\u00e9e. Les gaz qui la constituaient ont alors \u00e9t\u00e9 aspir\u00e9s par le trou noir, subissant une telle \u00e9l\u00e9vation de temp\u00e9rature qu&rsquo;ils ont produit la lueur observ\u00e9e par les astronomes.<\/p>\n<p style=\"text-align: justify;\">Les <a class=\"lien_interne\" href=\"http:\/\/www.lemonde.fr\/analyses\/\">analyses<\/a> du ph\u00e9nom\u00e8ne ont r\u00e9v\u00e9l\u00e9 qu&rsquo;en l&rsquo;occurrence le trou noir s&rsquo;\u00e9tait gorg\u00e9 de grandes quantit\u00e9s d&rsquo;h\u00e9lium. Cela signifie que l&rsquo;\u00e9toile absorb\u00e9e \u00e9tait le c\u0153ur d&rsquo;une <em>\u00ab\u00a0g\u00e9ante rouge\u00a0\u00bb<\/em>. L&rsquo;enveloppe d&rsquo;hydrog\u00e8ne qui constituait son atmosph\u00e8re avait vraisemblablement d\u00e9j\u00e0 \u00e9t\u00e9 dig\u00e9r\u00e9e lors d&rsquo;un pr\u00e9c\u00e9dent passage aux abords du trou noir. <em>\u00ab\u00a0L&rsquo;\u00e9toile avait de peu surv\u00e9cu \u00e0 sa premi\u00e8re rencontre avec le trou noir, et le deuxi\u00e8me round lui a \u00e9t\u00e9 fatal\u00a0\u00bb<\/em>, r\u00e9sume Ryan Chornock.<\/p>\n<p style=\"text-align: justify;\">De son c\u00f4t\u00e9, \u00ab\u00a0Sgr A*\u00a0\u00bb (Sagittarius A \u00e9toile), le trou noir supermassif se trouvant au centre de notre galaxie, s&rsquo;appr\u00eate \u00e0 <a class=\"lien_interne\" href=\"http:\/\/conjugaison.lemonde.fr\/conjugaison\/deuxieme-groupe\/engloutir\" target=\"_blank\">engloutir<\/a> prochainement un gros nuage de gaz qui s&rsquo;en approche. La vitesse de ce nuage a d\u00e9j\u00e0 quasiment doubl\u00e9 au cours des sept derni\u00e8res ann\u00e9es et atteint d\u00e9j\u00e0 8 millions de km\/h. Durant l&rsquo;\u00e9t\u00e9 2013, le nuage s&rsquo;approchera \u00e0 40 milliards de km de <em>\u00ab\u00a0l&rsquo;horizon des \u00e9v\u00e9nements\u00a0\u00bb<\/em> du trou noir, limite \u00e0 <a class=\"lien_interne\" href=\"http:\/\/conjugaison.lemonde.fr\/conjugaison\/troisieme-groupe\/partir\" target=\"_blank\">partir<\/a> de laquelle ce qui s&rsquo;y passe reste inaccessible, aucune mati\u00e8re ni lumi\u00e8re ne pouvant s&rsquo;en \u00e9chapper pour nous le d\u00e9voiler.<\/p>\n<p class=\"lire\"><a class=\"lien_interne\" href=\"http:\/\/www.lemonde.fr\/sciences\/article\/2012\/05\/02\/http%20:%20%3Cstrong%3E\/\/conjugaison.lemonde.fr\/conjugaison\/troisieme-groupe\/lire\" target=\"_blank\">Lire<\/a> : <a href=\"http:\/\/passeurdesciences.blog.lemonde.fr\/2011\/12\/08\/decouverte-des-plus-gros-trous-noirs-jamais-observes\/\" target=\"_blank\">\u00ab\u00a0D\u00e9couverte des plus gros trous noirs jamais observ\u00e9s\u00a0\u00bb<\/a><\/p>\n<div><ins style=\"display: 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