{"id":114755,"date":"2024-10-16T10:30:02","date_gmt":"2024-10-16T03:30:02","guid":{"rendered":"https:\/\/hotvideos24.online\/?p=114755"},"modified":"2024-10-16T10:30:02","modified_gmt":"2024-10-16T03:30:02","slug":"researchers-claim-to-have-found-the-oldest-stellar-disk-in-the-milky-way-galaxy","status":"publish","type":"post","link":"https:\/\/hotvideos24.online\/?p=114755","title":{"rendered":"Researchers claim to have found the oldest stellar disk in the Milky Way galaxy"},"content":{"rendered":"<p> <script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3711241968723425\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-layout-key=\"-fb+5w+4e-db+86\"\r\n     data-ad-client=\"ca-pub-3711241968723425\"\r\n     data-ad-slot=\"7910942971\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><br \/>\n<\/p>\n<div>\n<div class=\"article-gallery lightGallery\">\n<div data-thumb=\"https:\/\/scx1.b-cdn.net\/csz\/news\/tmb\/2024\/researchers-claim-to-h.jpg\" data-src=\"https:\/\/scx2.b-cdn.net\/gfx\/news\/2024\/researchers-claim-to-h.jpg\" data-sub-html=\"Scale height-to-length ratio as a function of age, comparing Milky Way observations with TNG50 simulations. Credit: &lt;i&gt;Nature Astronomy&lt;\/i&gt; (2024). DOI: 10.1038\/s41550-024-02382-w\">\n<figure class=\"article-img\">\n            <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/scx1.b-cdn.net\/csz\/news\/800a\/2024\/researchers-claim-to-h.jpg\" alt=\"Researchers claim to have found the oldest stellar disc in the Milky Way galaxy\" title=\"Scale height-to-length ratio as a function of age, comparing Milky Way observations with TNG50 simulations. Credit: Nature Astronomy (2024). DOI: 10.1038\/s41550-024-02382-w\" width=\"747\" height=\"530\"\/><figcaption class=\"text-darken text-low-up text-truncate-js text-truncate mt-3\">\n                Scale height-to-length ratio as a function of age, comparing Milky Way observations with TNG50 simulations. Credit: <i>Nature Astronomy<\/i> (2024). DOI: 10.1038\/s41550-024-02382-w<br \/>\n            <\/figcaption><\/figure>\n<\/p><\/div>\n<\/div>\n<p>A team of astronomers and astrophysicists at the Chinese Academy of Sciences and the University of Toronto has found what they believe is the oldest stellar disk in the Milky Way galaxy. In their <a href=\"https:\/\/www.nature.com\/articles\/s41550-024-02382-w\" target=\"_blank\" rel=\"noopener\">study<\/a>, reported in the journal <i>Nature Astronomy<\/i>, the group used high-\u03b1 stars with substantial orbital angular momentum to conduct age determinations across a wide range of stars in the galaxy.<\/p>\n<p>Prior research has shown that the Milky Way started its life as a single entity. Over time, it has drawn in multiple other galaxies, making it much bigger\u2014remnants of such galaxies have been found throughout the Milky Way. Such additions have made it difficult for astronomers to determine the original structure of the Milky Way.<\/p>\n<p>In this new effort, the research team claims that by dating a large number of stars in different parts of the galaxy, they were able to narrow their focus to a particular group that they believe represents the original galaxy disk. The team named the disk PanGu.<\/p>\n<p>By dating the stars in the galaxy, the researchers also found evidence that they have a combined mass of approximately 3.7 billion times that of the sun. These findings challenge prior theories because the first stars likely came to exist approximately 400 billion years after the Big Bang, which translates to 13.4 billion years ago; they could not have belonged to structured galaxies until approximately 12.5 billion years ago.<\/p>\n<p>This suggests the Milky Way would not have had time to gain such mass. But the research team is insistent, suggesting further that a steady rate of star production could have resulted in the mass they calculated\u2014the rest of the stars in the early Milky Way would have expired as supernovas.<\/p>\n<p>That, the team claims, leaves the current <a href=\"https:\/\/phys.org\/tags\/disk\/\" rel=\"tag\" class=\"textTag\">disk<\/a> with 2.2 billion <a href=\"https:\/\/phys.org\/tags\/solar+masses\/\" rel=\"tag\" class=\"textTag\">solar masses<\/a>\u2014a figure that represents just 0.2% of the current <a href=\"https:\/\/phys.org\/tags\/mass\/\" rel=\"tag\" class=\"textTag\">mass<\/a> of the galaxy, demonstrating just how much of the Milky Way is made up of material from other galaxies.<\/p>\n<p>The team also suggests their evidence shows that the Milky Way reached its maximum size approximately 11 billion years ago.<\/p>\n<div class=\"article-main__more p-4\">\n<p><strong>More information:<\/strong><br \/>\n\t\t\t\t\t\t\t\t\t\t\t\tMaosheng Xiang et al, The formation and survival of the Milky Way&#8217;s oldest stellar disk, <i>Nature Astronomy<\/i> (2024). <a data-doi=\"1\" href=\"https:\/\/dx.doi.org\/10.1038\/s41550-024-02382-w\" target=\"_blank\" rel=\"noopener\">DOI: 10.1038\/s41550-024-02382-w<\/a><\/p>\n<\/p><\/div>\n<p class=\"article-main__note mt-4\">\n\t\t\t\t\t\t\t\t\t\t\t\t  \u00a9 2024 Science X Network\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n<p>\t\t\t\t\t\t\t\t\t\t<!-- print only --><\/p>\n<div class=\"d-none d-print-block\">\n<p>\n\t\t\t\t\t\t\t\t\t\t\t\t<strong>Citation<\/strong>:<br \/>\n\t\t\t\t\t\t\t\t\t\t\t\tResearchers claim to have found the oldest stellar disk in the Milky Way galaxy (2024, October 15)<br \/>\n\t\t\t\t\t\t\t\t\t\t\t\tretrieved 15 October 2024<br \/>\n\t\t\t\t\t\t\t\t\t\t\t\tfrom https:\/\/phys.org\/news\/2024-10-oldest-stellar-disk-milky-galaxy.html\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n<p>\n\t\t\t\t\t\t\t\t\t\t\t This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no<br \/>\n\t\t\t\t\t\t\t\t\t\t\t part may be reproduced without the written permission. The content is provided for information purposes only.\n\t\t\t\t\t\t\t\t\t\t\t <\/p>\n<\/p><\/div>\n<\/p><\/div>\n<p><script id=\"facebook-jssdk\" async=\"\" src=\"https:\/\/connect.facebook.net\/en_US\/sdk.js\"><\/script><br \/>\n<br \/><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3711241968723425\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-format=\"fluid\"\r\n     data-ad-layout-key=\"-fb+5w+4e-db+86\"\r\n     data-ad-client=\"ca-pub-3711241968723425\"\r\n     data-ad-slot=\"7910942971\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><br \/>\n<br \/><div data-type=\"_mgwidget\" data-widget-id=\"1660802\">\r\n<\/div>\r\n<script>(function(w,q){w[q]=w[q]||[];w[q].push([\"_mgc.load\"])})(window,\"_mgq\");\r\n<\/script>\r\n<br \/>\n<br \/><a href=\"https:\/\/phys.org\/news\/2024-10-oldest-stellar-disk-milky-galaxy.html\">Source link <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scale height-to-length ratio as a function of age, comparing Milky Way observations with TNG50 simulations. Credit: Nature Astronomy (2024). DOI: 10.1038\/s41550-024-02382-w A team of astronomers and astrophysicists at the Chinese &hellip; <a href=\"https:\/\/hotvideos24.online\/?p=114755\" class=\"more-link\">Read More<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[8628],"tags":[],"class_list":["post-114755","post","type-post","status-publish","format-standard","hentry","category-science","entry"],"_links":{"self":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts\/114755","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=114755"}],"version-history":[{"count":0,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=\/wp\/v2\/posts\/114755\/revisions"}],"wp:attachment":[{"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=114755"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=114755"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hotvideos24.online\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=114755"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}