{"id":20244,"date":"2025-07-24T16:34:27","date_gmt":"2025-07-24T14:34:27","guid":{"rendered":"https:\/\/reperes-astro.fr\/?p=20244"},"modified":"2025-07-26T17:17:13","modified_gmt":"2025-07-26T15:17:13","slug":"m-31-une-decouverte-resolue-apres-plus-de-deux-ans-de-mystere","status":"publish","type":"post","link":"https:\/\/reperes-astro.fr\/m-31-une-decouverte-resolue-apres-plus-de-deux-ans-de-mystere\/","title":{"rendered":"M 31 : Une d\u00e9couverte enfin r\u00e9solue"},"content":{"rendered":"\n<h2 class=\"wp-block-heading has-medium-font-size\"><strong><span style=\"text-decoration: underline;\">Communiqu\u00e9 des PIAFS<\/span><\/strong> :<\/h2>\n\n\n\n<p><br>Le 9 janvier 2023, nous partagions avec \u00e9motion notre d\u00e9couverte : la d\u00e9tection d\u2019un arc dans la direction de la galaxie d\u2019Androm\u00e8de (<strong>M31<\/strong>), identifi\u00e9 sous le nom <strong>SDSO1<\/strong> (Strottner Drechsler Sainty Object 1).<\/p>\n\n\n\n<p>Apr\u00e8s plus de deux ans d\u2019investigations men\u00e9es par plusieurs \u00e9quipes scientifiques \u00e0 travers le monde, le voile se l\u00e8ve enfin sur sa v\u00e9ritable nature : une n\u00e9buleuse plan\u00e9taire fant\u00f4me situ\u00e9e non pas dans M31, mais au sein m\u00eame de notre propre galaxie, align\u00e9e dans sa direction.<\/p>\n\n\n\n<p>Cette n\u00e9buleuse est extr\u00eamement ancienne, environ 400 000 ans, avec un diam\u00e8tre de 65,2 ann\u00e9es-lumi\u00e8re, soit plus de 617 200 000 000 000 km.<\/p>\n\n\n<div class=\"wp-block-image\">\n<figure class=\"aligncenter size-full\"><a href=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2025\/07\/m31-nebuleuse-planetaire-fantome-e1753460973665.webp\"><img loading=\"lazy\" decoding=\"async\" width=\"687\" height=\"620\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2025\/07\/m31-nebuleuse-planetaire-fantome-e1753460973665.webp\" alt=\"Une d\u00e9couverte enfin r\u00e9solue\" class=\"wp-image-20245\" srcset=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2025\/07\/m31-nebuleuse-planetaire-fantome-e1753460973665.webp 687w, https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/uploads\/2025\/07\/m31-nebuleuse-planetaire-fantome-e1753460973665-300x271.webp 300w\" sizes=\"auto, (max-width: 687px) 100vw, 687px\" \/><\/a><\/figure>\n<\/div>\n\n\n<p><\/p>\n\n\n\n<p>SDSO1 devient donc le premier membre reconnu d\u2019une nouvelle classe de n\u00e9buleuses, les \u00ab\u00a0n\u00e9buleuses plan\u00e9taires fant\u00f4mes\u00a0\u00bb ou <strong>GPN<\/strong> pour Ghost Planetary Nebula) qui ne sont visibles que gr\u00e2ce \u00e0 leur interaction avec le gaz interstellaire environnant, comme l&rsquo;arc de choc observ\u00e9 ici.<\/p>\n\n\n\n<p>Cette recherche a permis le d\u00e9veloppement de nouveaux proc\u00e9d\u00e9s collaboratifs entre astrophotographes et chercheurs, donnant naissance \u00e0 une image in\u00e9dite de SDSO1 et de M31, fruit de 555 heures de pose cumul\u00e9e.<\/p>\n\n\n\n<p>Un immense bravo \u00e0 toutes les \u00e9quipes impliqu\u00e9es dans cette formidable aventure scientifique et humaine.<\/p>\n\n\n\n<p>Toutes les infos scientifiques, les process, ainsi que l&rsquo;image HD sont <strong><a href=\"https:\/\/app.astrobin.com\/i\/ns2x09\">ici<\/a><\/strong>.<br><br>La publication scientifique est <strong><a href=\"https:\/\/arxiv.org\/pdf\/2507.15834\">ici<\/a><\/strong>.<\/p>\n\n\n\n<p class=\"has-text-align-center\"><strong><span style=\"text-decoration: underline;\">D\u00e9couvreurs et astrophotographes<\/span> :<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center\">Yann Sainty<br>Marcel Drechsler<br>Xavier Strottner<\/p>\n<div class=\"pvc_clear\"><\/div><p id=\"pvc_stats_20244\" class=\"pvc_stats all  \" data-element-id=\"20244\" style=\"\"><i class=\"pvc-stats-icon medium\" aria-hidden=\"true\"><svg aria-hidden=\"true\" focusable=\"false\" data-prefix=\"far\" data-icon=\"chart-bar\" 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12.8-12.8V140.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v198.4c0 6.4 6.4 12.8 12.8 12.8zm96 0h22.4c6.4 0 12.8-6.4 12.8-12.8V204.8c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v134.4c0 6.4 6.4 12.8 12.8 12.8zM496 400H48V80c0-8.84-7.16-16-16-16H16C7.16 64 0 71.16 0 80v336c0 17.67 14.33 32 32 32h464c8.84 0 16-7.16 16-16v-16c0-8.84-7.16-16-16-16zm-387.2-48h22.4c6.4 0 12.8-6.4 12.8-12.8v-70.4c0-6.4-6.4-12.8-12.8-12.8h-22.4c-6.4 0-12.8 6.4-12.8 12.8v70.4c0 6.4 6.4 12.8 12.8 12.8z\" class=\"\"><\/path><\/svg><\/i> <img loading=\"lazy\" decoding=\"async\" width=\"16\" height=\"16\" alt=\"Loading\" src=\"https:\/\/reperes-astro.fr\/%77%70%2d%63%6f%6e%74%65%6e%74\/plugins\/page-views-count\/ajax-loader-2x.gif\" border=0 \/><\/p>\n<div 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