{"id":374957,"date":"2026-11-03T17:54:23","date_gmt":"2026-11-03T12:24:23","guid":{"rendered":"https:\/\/forumias.com\/blog\/?p=374957"},"modified":"2026-11-03T17:54:23","modified_gmt":"2026-11-03T12:24:23","slug":"ultraluminous-x-ray-sources-ulxs","status":"publish","type":"post","link":"https:\/\/forumias.com\/blog\/ultraluminous-x-ray-sources-ulxs\/","title":{"rendered":"Ultraluminous X-ray Sources (ULXs)"},"content":{"rendered":"<div class=\"content-box-green\">\n<p><strong>News:<\/strong> Astronomers studied New General Catalogue (NGC) 4490 ULX-8 over 24 years, revealing changes in its X-ray behaviour and providing insights into the black hole powering it.<\/p>\n<\/div>\n<h2 class=\"red-h2-box\">About Ultraluminous X-ray Sources (ULXs)<\/h2>\n<figure id=\"attachment_374961\" aria-describedby=\"caption-attachment-374961\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><img data-recalc-dims=\"1\" loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-374961\" src=\"https:\/\/i0.wp.com\/forumias.com\/blog\/wp-content\/uploads\/2026\/11\/Source-ScienceTech-Daily.jpg?resize=300%2C169&#038;ssl=1\" alt=\"Ultraluminous X-ray Sources (ULXs)\" width=\"300\" height=\"169\" srcset=\"https:\/\/i0.wp.com\/forumias.com\/blog\/wp-content\/uploads\/2026\/11\/Source-ScienceTech-Daily.jpg?resize=300%2C169&amp;ssl=1 300w, https:\/\/i0.wp.com\/forumias.com\/blog\/wp-content\/uploads\/2026\/11\/Source-ScienceTech-Daily.jpg?resize=1024%2C576&amp;ssl=1 1024w, https:\/\/i0.wp.com\/forumias.com\/blog\/wp-content\/uploads\/2026\/11\/Source-ScienceTech-Daily.jpg?resize=768%2C432&amp;ssl=1 768w, https:\/\/i0.wp.com\/forumias.com\/blog\/wp-content\/uploads\/2026\/11\/Source-ScienceTech-Daily.jpg?w=1071&amp;ssl=1 1071w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-374961\" class=\"wp-caption-text\">Source &#8211; ScienceTech Daily<\/figcaption><\/figure>\n<ul>\n<li>The Ultraluminous X-ray Sources (<strong>ULXs<\/strong>) are <strong>extremely bright X-ray sources<\/strong> in nearby galaxies that <strong>emit more radiation in X-rays than a million suns emit across all wavelengths.<\/strong><\/li>\n<li><strong>Nature:<\/strong> ULXs are thought to be <strong>powered by neutron stars or black holes that draw matter from a companion star.<\/strong><\/li>\n<li><strong>Occurrence:<\/strong> <strong>Most<\/strong> galaxies, including the <strong>Milky Way<\/strong>, <strong>have no ULXs.<\/strong>\n<ul>\n<li><strong>Galaxies that host them usually contain only one.<\/strong><\/li>\n<\/ul>\n<\/li>\n<li><strong>Identification:<\/strong> Astronomers <strong>identified seven ULXs<\/strong> in the ring galaxy New General Catalogue (NGC) 922 <strong>using the Chandra X-ray Observatory.<\/strong><\/li>\n<li><strong>Key Characteristics<\/strong>\n<ul>\n<li><strong>Extreme Luminosity:<\/strong> ULXs appear <strong>brighter than expected from the classical Eddington limit.<\/strong><\/li>\n<li><strong>Eddington Limit:<\/strong> It is the <strong>point at which the outward pressure of radiation balances the inward pull of gravity.<\/strong>\n<ul>\n<li><strong>Above this<\/strong> limit, <strong>radiation pressure should push away the gas that fuels an object<\/strong>, making continued accretion difficult.<\/li>\n<\/ul>\n<\/li>\n<li><strong>Accretion Process:<\/strong> Matter drawn from a companion <strong>star falls inward, heats up and emits intense X-rays.<\/strong><\/li>\n<li><strong>Compact Objects:<\/strong> ULXs are thought to <strong>contain neutron stars or black holes.<\/strong>\n<ul>\n<li>The <strong>study of ULX-8 provides evidence that it is powered by a stellar-mass black hole<\/strong> accreting matter at or near the Eddington limit.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>News: Astronomers studied New General Catalogue (NGC) 4490 ULX-8 over 24 years, revealing changes in its X-ray behaviour and providing insights into the black hole powering it. About Ultraluminous X-ray Sources (ULXs) The Ultraluminous X-ray Sources (ULXs) are extremely bright X-ray sources in nearby galaxies that emit more radiation in X-rays than a million suns&hellip; <a class=\"more-link\" href=\"https:\/\/forumias.com\/blog\/ultraluminous-x-ray-sources-ulxs\/\">Continue reading <span class=\"screen-reader-text\">Ultraluminous X-ray Sources (ULXs)<\/span><\/a><\/p>\n","protected":false},"author":10401,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"jetpack_post_was_ever_published":false,"footnotes":""},"categories":[1566,1738,12039],"tags":[11872],"class_list":["post-374957","post","type-post","status-publish","format-standard","hentry","category-daily-factly-articles","category-science-and-technology-daily-factly-articles","category-knolls","tag-9pm-daily-factly","entry"],"jetpack_featured_media_url":"","views":"","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/posts\/374957","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/users\/10401"}],"replies":[{"embeddable":true,"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/comments?post=374957"}],"version-history":[{"count":0,"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/posts\/374957\/revisions"}],"wp:attachment":[{"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/media?parent=374957"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/categories?post=374957"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/forumias.com\/blog\/wp-json\/wp\/v2\/tags?post=374957"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}